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Simbi ye20MnTiB ndiyo inonyanya kushandiswa pakugadzira mabhiriji esimbi munyika yangu, uye mashandiro ayo akakosha pakushanda kwakachengeteka kwemabhiriji. Zvichibva pakuferefeta kwemamiriro ekunze muChongqing, chidzidzo ichi chakagadzira mhinduro yekuora inotevedzera mamiriro ekunze ane hunyoro eChongqing, uye yakaita bvunzo dzekuora kwehunyoro hwemabhoti ane hunyoro hweChongqing. Mhedzisiro yekupisa, pH kukosha uye kuunganidzwa kwemhinduro yekuora inotevedzera maitiro ekuora kwehunyoro hwemabhoti ane hunyoro hwe20MnTiB zvakadzidzwa.
Simbi ye20MnTiB ndiyo inonyanya kushandiswa pakugadzira mabhiriji esimbi munyika yangu, uye mashandiro ayo akakosha pakushanda kwakachengeteka kwemabhiriji. Li et al. 1 vakaedza hunhu hwesimbi ye20MnTiB inowanzoshandiswa mumabhoti emhando ye10.9 ane simba guru mukupisa kwakanyanya kwe20~700 ℃, uye vakawana curve yekumanikidzwa, simba rekuyedza, simba rekudhonza, modulus yaYoung, uye elongation. uye expansion coefficient.Zhang et al. 2, Hu et al. 3, nezvimwewo, kuburikidza nekuyedza makemikari, kuyedza michina, kuyedza microstructure, kuongorora macroscopic uye microscopic pamusoro peshinda, uye mhedzisiro inoratidza kuti chikonzero chikuru chekutyoka kwemabhoti ane simba guru chine chekuita nekukanganisa kweshinda, uye kuitika kwezvikanganiso zveshinda. Kuwanda kukuru kwekumanikidzwa, kuwanda kwekumanikidzwa kwetipi yekuputika uye mamiriro ekuora kwemhepo yakazaruka zvese zvinotungamira mukupwanyika kwekushomeka kwengura.
Mabhaudhi ane simba guru esimbi anowanzo shandiswa kwenguva yakareba munzvimbo ine hunyoro. Zvinhu zvakaita sehunyoro hwakawanda, tembiricha yakakwira, uye kunyudzwa kwemvura uye kunyudzwa kwezvinhu zvinokuvadza munharaunda zvinogona kukonzera ngura yezvivakwa zvesimbi zviri nyore. Kuora kunogona kukonzera kurasikirwa kwemabhaudhi ane simba rakawanda, zvichikonzera zvikanganiso zvakawanda uye kuputika. Uye zvikanganiso izvi nekuputika zvicharamba zvichiwedzera, nokudaro zvichideredza hupenyu hwemabhaudhi ane simba rakawanda uye zvichitoita kuti aputsike. Kusvika pari zvino, kune zvidzidzo zvakawanda pamusoro pemhedzisiro yekuora kwezvakatipoteredza pakushanda kwekuora kwezvinhu. Catar et al4 vakaongorora maitiro ekuora kwesimba remagnesium alloys ane zviri mukati zvakasiyana zvealuminium munzvimbo dzine acidic, alkaline uye neutral ne slow strain rate testing (SSRT). Abdel et al.5 vakadzidza maitiro e electrochemical uye stress corrosion cracking eCu10Ni alloy mu 3.5% NaCl solution pamberi pehuwandu hwakasiyana hwe sulfide ions. Aghion et al.6 vakaongorora mashandiro ekuora kwe die-cast magnesium alloy MRI230D mu 3.5% NaCl solution ne immersion test, salt spray test, potentiodynamic polarization analysis uye SSRT.Zhang nevamwe.7 vakadzidza maitiro ekuora kwesimbi yemartensitic ye9Cr vachishandisa SSRT uye nzira dzechinyakare dzekuongorora electrochemical, uye vakawana simba remaion echloride pamaitiro ekuora kwesimbi yemartensitic patembiricha yemumba. Chen nevamwe.8 vakaongorora maitiro ekuora kwesimbi yeX70 mumhinduro yematope egungwa ine SRB patembiricha dzakasiyana neSSRT. Liu nevamwe.9 vakashandisa SSRT kudzidza simba rekupisa uye mwero wekuoma kwesimba pakudzivirira kupisa kwesimbi yegungwa ye00Cr21Ni14Mn5Mo2N austenitic stainless steel. Mhedzisiro yacho inoratidza kuti tembiricha iri pakati pe35~65℃ haina simba guru pamaitiro ekuora kwesimbi ye ... 10 vakaongorora kunonoka kwekutyoka kwemasampuli ane magiredhi akasiyana esimba rekudhonza nekuyedzwa kwekutyoka kwakanonoka uye SSRT. Zvinokurudzirwa kuti simba rekudhonza resimbi ye20MnTiB nesimbi ye35VB simbi ine simba guru rinofanira kudzorwa pa1040-1190MPa. Zvisinei, zvidzidzo izvi zvakawanda zvinoshandisa mhinduro iri nyore ye3.5% NaCl kutevedzera nharaunda inokuvadza, nepo nharaunda chaiyo yekushandisa mabhoti ane simba guru yakaoma uye ine zvinhu zvakawanda zvinopesvedzera, zvakaita sepH kukosha kwebhoti. Ananya et al. 11 vakadzidza mhedzisiro yemamiriro ekunze nezvinhu zviri mumhepo inoparadza pakuora nekupwanya kwesimbi dzisina tsvina mbiri. Sunada et al. 12 vakaita bvunzo dzekupwanya ngura yekumanikidzwa kwekupisa kwekamuri pasimbi yeSUS304 mumvura ine mvura ine H2SO4 (0-5.5 kmol/m-3) uye NaCl (0-4.5 kmol/m-3). Mhedzisiro yeH2SO4 neNaCl pamhando dzengura dzesimbi yeSUS304 yakadzidzwawo. Merwe et al.13 vakashandisa SSRT kudzidza mhedzisiro yekutenderera, tembiricha, huwandu hweCO2/CO, kumanikidzwa kwegasi uye nguva yekuora pakumanikidzwa kwekumanikidzwa kwekusvibiswa kwesimbi yemidziyo yeA516. Vachishandisa mhinduro yeNS4 semhinduro yekutevedzera mvura yepasi pevhu, Ibrahim et al. 14 vakaongorora mhedzisiro yemamiriro ekunze akadai sehuwandu hwebicarbonate ion (HCO) , pH uye tembiricha pakupwanya ngura yekumanikidzwa kwesimbi yepipeline yeAPI-X100 mushure mekubviswa kwejira. Shan et al. 15 vakadzidza mutemo wekusiyana kwesimba rekuputika kwesimbi isina tsvina inonzi austenitic 00Cr18Ni10 ine tembiricha pasi pemamiriro akasiyana ekupisa (30~250℃) pasi pemamiriro emvura nhema muchimiro chesimbi yemarasha-ku-hydrogen yakagadzirwa neSSRT.Han et al.16 vakaratidza simba rekuputika kwehydrogen remasampuli ebolt ane simba rakawanda vachishandisa bvunzo yekupwanyika yakanonoka uye SSRT.Zhao17 vakadzidza mhedzisiro yepH, SO42-, Cl-1 pamaitiro ekuputika kweGH4080A alloy neSSRT.Mhedzisiro yacho inoratidza kuti kana pH yakadzikira, kuramba kupisa kweGH4080A alloy kuchinyanya kuipa.Ine simba rekuputika kwestress kuCl-1, uye hainzwisisi SO42-ionic medium patembiricha yemumba.Zvisinei, pane zvidzidzo zvishoma pamusoro pemhedzisiro yekuputika kwezvakatipoteredza pa20MnTiB steel high-strength bolts.
Kuti awane zvikonzero zvekukundikana kwemabhoti ane simba guru anoshandiswa mumabhiriji, munyori akaita zvidzidzo zvakasiyana-siyana. Samples dzemabhoti ane simba guru dzakasarudzwa, uye zvikonzero zvekukundikana kwemasampuli aya zvakakurukurwa kubva pamaonero emakemikari, fracture microscopic morphology, metallographic structure uye mechanical properties analysis19, 20. Zvichibva pakuferefeta kwemamiriro ekunze emuchadenga muChongqing mumakore achangopfuura, chirongwa chekuora chinotevedzera mamiriro ekunze ane hunyoro eChongqing chakagadzirwa. Kuedza kwekuora kwechisimba, kuyedza kwekuora kwemagetsi uye kuyedza kwekuneta kwekuora kwemabhoti ane simba guru muChongqing kwakaedzwa. Muchidzidzo ichi, mhedzisiro yekupisa, pH kukosha uye kuwanda kwemhinduro yekuora yakaedzwa pamaitiro ekuora kwechisimba kwe20MnTiB high-strength bolts zvakaongororwa kuburikidza nemiedzo yezvigadzirwa zvemakanika, kuongorora kwemacroscopic nemicroscopic, uye zvigadzirwa zvekuora kwepamusoro.
Chongqing iri kumaodzanyemba kwakadziva kumadokero kweChina, nzvimbo dzekumusoro dzeRwizi rweYangtze, uye ine mamiriro ekunze ane hunyoro emumvura. Avhareji yekupisa kwegore negore i16-18°C, avhareji yehunyoro hwegore negore inonyanya kuva 70-80%, maawa ezuva pagore i1000-1400 maawa, uye chikamu chezuva i25-35% chete.
Zvinoenderana nemishumo ine chekuita nezuva uye tembiricha yekunze muChongqing kubva muna 2015 kusvika 2018, avhareji yetembiricha yezuva nezuva muChongqing yakaderera kusvika 17°C uye yakakwira kusvika 23°C. Tembiricha yepamusoro-soro pabhiriji reChaotianmen Bridge muChongqing inogona kusvika 50°C °C21,22. Saka, tembiricha yekuyedza ngura yestress yakaiswa pa25°C ne50°C.
Kuwanda kwepH kwemhinduro yekuora yakaedzwa kunosarudza zvakananga huwandu hweH+, asi hazvirevi kuti kana pH yakaderera, ngura iri nyore kuitika. Mhedzisiro yepH pamhedzisiro inosiyana pazvinhu zvakasiyana uye mhinduro. Kuti tidzidze zviri nani mhedzisiro yemhinduro yekuora yakaedzwa pakushanda kwekuora kwekumanikidzwa kwemabhoti ane simba rakawanda, pH kukosha kwekuyedza kwekuora kwekumanikidzwa kwakaiswa pa3.5, 5.5 uye 7.5 pamwe chete neongororo yemabhuku23 uye huwandu hwepH yemvura yemvura inonaya pagore muChongqing.2010 kusvika 2018.
Kana huwandu hwemhinduro yekuora yakaedzwa hwakakwira, huwandu hwakawanda hweion mumhinduro yekuora yakaedzwa hwakawedzera, uye simba guru pahunhu hwezvinhu. Kuti tidzidze mhedzisiro yehuwandu hwemhinduro yekuora yakaedzwa pakuora kwekumanikidzwa kwemabhoti ane simba rakawanda, bvunzo yekukurumidzira yekuora yakaitwa murabhoritari yakagadzirwa, uye huwandu hwemhinduro yekuora hwakaedzwa hwakagadzwa padanho rechina pasina ngura, izvo zvaive huwandu hwemhinduro yekuora hwakaedzwa (1×), huwandu hwemhinduro yekuora hwakaedzwa (20 ×) uye huwandu hwemhinduro yekuora hwakaedzwa (200 ×).
Nzvimbo ine tembiricha ye25℃, pH ye5.5, uye huwandu hwemhinduro yekutanga yekuora ndiyo iri pedyo nemamiriro chaiwo ekushandiswa kwemabhoti ane simba guru emabhiriji. Zvisinei, kuti kukurumidzise maitiro ekuyedza ngura, mamiriro ekuyedza ane tembiricha ye25 °C, pH ye5.5 uye huwandu hwemhinduro yekutanga yekuora yakaenzaniswa ye200 × akaiswa seboka rekutonga. Apo mhedzisiro yetembiricha, huwandu kana pH yemhinduro yekuora yakaenzaniswa pakushanda kwekuora kwestress kwemabhoti ane simba guru yakaongororwa zvakateerana, zvimwe zvinhu zvakaramba zvisina kuchinja, izvo zvakashandiswa sedanho rekuyedza reboka rekutonga rekutarisa.
Zvinoenderana ne2010-2018 atmospheric environment quality briefing yakabudiswa neChongqing Municipal Bureau of Ecology and Environment, uye ichitaura nezvezvinhu zvemvura zvakataurwa muZhang24 nedzimwe zvinyorwa zvakataurwa muChongqing, mhinduro yekuora yakaedzwa yakavakirwa pakuwedzera huwandu hweSO42- yakagadzirwa. Kuumbwa kwemvura munzvimbo huru yeguta reChongqing muna 2017. Kuumbwa kwemhinduro yekuora yakaedzwa kunoratidzwa muTafura 1:
Mhinduro yekuora inogadzirwa nenzira yemakemikari inoenzanisa maion uchishandisa ma analytical reagents nemvura yakasanganiswa. pH kukosha kwemhinduro yekuora inogadzirwa nenzira yekufananidzira yakagadziriswa ne pH meter chaiyo, nitric acid solution uye sodium hydroxide solution.
Kuti ifananidze mamiriro ekunze ane hunyoro muChongqing, muchina wekuyedza kupisa munyu wakagadziridzwa uye wakagadzirwa25.Sezvinoratidzwa muMufananidzo 1, michina yekuyedza ine masisitimu maviri: sisitimu yekupfapfaidza munyu uye sisitimu yemwenje. Sisitimu yekupfapfaidza munyu ndiyo basa guru remuchina wekuyedza, une chikamu chekudzora, chikamu chekupfapfaidza uye chikamu chekupinza.Basa rechikamu chekupfapfaidza nderekupomba mhute yemunyu mukamuri yekuyedza kuburikidza necompressor yemhepo. Chikamu chekupinza chakagadzirwa nezvinhu zvekuyera tembiricha, zvinonzwa tembiricha mukamuri yekuyedza. Chikamu chekudzora chakagadzirwa ne microcomputer, iyo inobatanidza chikamu chekupfapfaidza nechikamu chekupinza kuti idzore maitiro ese ekuyedza. Sisitimu yemwenje yakaiswa mukamuri yekuyedza kupisa munyu kuti ifananidze chiedza chezuva. Sisitimu yemwenje ine marambi e infrared uye chinodzora nguva.Panguva imwe chete, sensor yekupisa inoiswa mukamuri yekuyedza kupisa munyu kuti iongorore tembiricha yakatenderedza sampuro munguva chaiyo.
Sampuli dzeStress corrosion pasi pemutoro usingachinji dzakagadziriswa zvichienderana neNACETM0177-2005 (Laboratory Testing of Sulfide Stress Cracking and Stress Corrosion Cracking Resistance of Metals in a H2S Environment). Sampuli dzeStress corrosion dzakatanga dzacheneswa neacetone uye ultrasonic mechanical cleaning kuti dzibvise mafuta akasara, dzozobviswa mvura nedoro dzoomeswa muovheni. Wobva waisa sampuro dzakachena mukamuri rekuyedza remuchina wekuyedza salt spray kuti dzitevedzere mamiriro ekuora munzvimbo ine hunyoro yeChongqing. Zvichienderana ne standard NACETM0177-2005 uye salt spray test standard GB/T 10,125-2012, nguva yekuyedza constant load stress corrosion muchidzidzo ichi yakatsanangurwa zvakaenzana kuva maawa 168. Miedzo yeTensile yakaitwa pamasamples ecorrosion pasi pemamiriro akasiyana ekuora pamuchina wekuyedza weMTS-810 universal tensile, uye hunhu hwavo hwemechanical uye fracture corrosion morphology zvakaongororwa.
Mufananidzo 1 unoratidza macro- uye micro-morphology yekuora kwepamusoro kwezviyero zvekuora zvine simba guru pasi pemamiriro akasiyana ekuora.2 ne3 zvichiteerana.
Maumbirwo makuru emasampuli ekuora kwestress emabhoti e20MnTiB ane simba guru pasi pemamiriro akasiyana ekuora akaedzwa: (a) hapana ngura; (b) kamwe chete; (c) 20 ×; (d) 200 ×; (e) pH3.5; (f) pH 7.5; (g) 50°C.
Micromorphology yezvigadzirwa zve corrosion zve 20MnTiB high-strength bolts munzvimbo dzakasiyana dze corrosion dzakaedzwa (100×): (a) kamwe chete; (b) 20 ×; (c) 200 ×; (d) pH3.5; (e) pH7 .5; (f) 50°C.
Zvinogona kuonekwa kubva paMufananidzo 2a kuti pamusoro pemuenzaniso webhoti risina ngura rine simba guru rinoratidza kupenya kwesimbi kwakajeka pasina ngura yakajeka. Zvisinei, pasi pemamiriro emhinduro yekutanga yekuora yakaedzwa (Mufananidzo 2b), pamusoro pemuenzaniso pakanga pakafukidzwa zvishoma nezvigadzirwa zvekuora zvakatsvuka uye zvakatsvukuruka, uye dzimwe nzvimbo dzepamusoro dzakaramba dzichiratidza kupenya kwesimbi kwakajeka, zvichiratidza kuti dzimwe nzvimbo dzepamusoro pemuenzaniso dzakanga dzaora zvishoma, uye mhinduro yekuora yakaedzwa haina kukanganisa pamusoro pemuenzaniso. Hunhu hwezvinhu hazvina zvazvinoita. Zvisinei, pasi pehuwandu hwe20 × original simulated corrosion solution concentration (Mufananidzo 2c), pamusoro pemhando yepamusoro yebhoti specimen yakafukidzwa zvizere nehuwandu hwakawanda hwezvinhu zvakasvibiswa neganda uye huwandu hushoma hwezvinhu zvakasvibiswa nebrown-red corrosion. Hapana kupenya kwesimbi kwakawanikwa, uye pakanga paine huwandu hushoma hwezvinhu zvakasvibiswa nebrown-black corrosion product pedyo nepamusoro pe substrate. Uye pasi pehuwandu hwe200 × original simulated corrosion solution concentration (Mufananidzo 2d), pamusoro pemuenzaniso wakafukidzwa zvizere nezvinhu zvakasvibiswa nebrown, uye zvigadzirwa zvakasvibiswa nebrown-black corrosion products zvinoonekwa mune dzimwe nzvimbo.
Sezvo pH yakaderera kusvika pa3.5 (Mufananidzo 2e), zvigadzirwa zvengura zvine ruvara rwebhuruu ndizvo zvakanyanya pamusoro pemasampuli, uye zvimwe zvezvinhu zvengura zvakanga zvabviswa.
Mufananidzo 2g unoratidza kuti sezvo tembiricha ichiwedzera kusvika 50 °C, huwandu hwezvinhu zvakaora zvakatsvuka-tsvuku pamusoro pemuenzaniso hunoderera zvakanyanya, nepo zvinhu zvakaora zvakatsvuka-tsvuku zvichifukidza pamusoro pemuenzaniso munzvimbo yakakura. Rutivi rwezvinhu zvakaora rwakareruka zvishoma, uye zvimwe zvigadzirwa zvakachena-nhema zvinobviswa.
Sezvakaratidzwa muMufananidzo 3, pasi pemamiriro akasiyana-siyana ekuora, zvigadzirwa zvengura pamusoro pe20MnTiB high-strength bolt stress corrosion specimens zviri pachena kuti zvakaparadzaniswa, uye ukobvu hwechikamu chekuora hunowedzera nekuwedzera kwekuwanda kwemhinduro yekuora yakaenzaniswa. Pasi pemamiriro emhinduro yekuora yekutanga yakaenzaniswa (Mufananidzo 3a), zvigadzirwa zvekuora pamusoro pemuenzaniso zvinogona kukamurwa kuita zvikamu zviviri: chikamu chekunze chezvigadzirwa zvekuora chakagoverwa zvakaenzana, asi huwandu hwakawanda hwemitswe hunoonekwa; chikamu chemukati iboka rakasununguka rezvigadzirwa zvekuora. Pasi pemamiriro e20× original yakaenzaniswa mhinduro yekuora (Mufananidzo 3b), chikamu chekuora pamusoro pemuenzaniso chinogona kukamurwa kuita zvikamu zvitatu: chikamu chekunze chinonyanya kupararira zvigadzirwa zvekuora zveboka, zvakasununguka uye zvine maburi, uye hazvina basa rakanaka rekudzivirira; Chikamu chepakati iboka rezvigadzirwa zvekuora rakafanana, asi kune mitswe yakajeka, uye maion ekuora anogona kupfuura nepakati pemitswe ndokuparadza substrate; chikamu chemukati chikamu chezvigadzirwa zvengura chakakora chisina mitswe yakajeka, icho chine mhedzisiro yakanaka yekudzivirira pane substrate. Pasi pemamiriro e200× original simulated corrosion solution concentration (Mufananidzo 3c), chikamu chengura chiri pamusoro pemuenzaniso chinogona kukamurwa kuita zvikamu zvitatu: chikamu chekunze chikamu chezvigadzirwa zvengura chakatetepa uye chakafanana; chikamu chepakati chinonyanya kuve chakaumbwa sepetal uye chakaumbwa seflake Chikamu chemukati chikamu chezvigadzirwa zvengura chakakora chisina mitswe yakajeka uye maburi, icho chine mhedzisiro yakanaka yekudzivirira pane substrate.
Zvinogona kuonekwa kubva paMufananidzo 3d kuti munzvimbo yekuora yakaedzwa yepH 3.5, kune huwandu hwakawanda hwezvigadzirwa zvekuora zvakaita seflocculent kana netsono pamusoro pe20MnTiB high-strength bolt sampuli. Zvinofungidzirwa kuti zvigadzirwa zvekuora izvi zvinonyanya kuve γ-FeOOH uye huwandu hushoma hweα-FeOOH hwakapindirana26, uye ngura yacho ine mitswe yakajeka.
Zvinogona kuonekwa kubva paMufananidzo 3f kuti apo tembiricha yakawedzera kusvika 50 °C, hapana jira remukati rengura rakawanikwa muchimiro chejira rengura, zvichiratidza kuti paive nemikana pakati pezvikamu zvengura pa50 °C, izvo zvakaita kuti substrate isafukidzwe zvizere nezvinhu zvengura. Inopa dziviriro kubva pakuwanda kwemaitiro engura esubstrate.
Hunhu hwemabhoti ane simba guru pasi pekuora kwemutoro nguva dzose munzvimbo dzakasiyana dzinoparadza hunoratidzwa muTafura 2:
Zvinogona kuonekwa kubva paTafura 2 kuti hunhu hwemakanika hwe20MnTiB high-strength bolt sampuli dzichiri kusangana nezvinodiwa zvakajairwa mushure mekunge dry-wet cycle yawedzera corrosion test munzvimbo dzakasiyana dze corrosion dzakaedzwa, asi pane kukuvara kwakati zvichienzaniswa nedzasina ngura. Pahuwandu hwe corrosion solution yekutanga yakaedzwa, hunhu hwemakanika hwemuenzaniso hauna kuchinja zvakanyanya, asi pahuwandu hwe20× ​​kana 200× hwe solution yakaedzwa, kureba kwemuenzaniso kwakadzikira zvakanyanya. Hunhu hwemakanika hwakafanana pahuwandu hwe20 × ne200 × original yakaedzwa corrosion solutions. Kana pH ye corrosion solution yakaedzwa yadzikira kusvika pa3.5, simba re tensile nekureba kwesampuli kwakadzikira zvakanyanya. Kana tembiricha yakwira kusvika pa50°C, simba re tensile nekureba kunodzikira zvakanyanya, uye chiyero chekudzikira kwenzvimbo chiri pedyo zvikuru nechiyero chakajairwa.
Magadzirirwo ekuputsika kwe20MnTiB high-strength bolt stress corrosion sampuli pasi pemamiriro akasiyana ekuputsika anoratidzwa muMufananidzo 4, ayo ari macro-morphology yekuputsika, nzvimbo yefiber iri pakati pekuputsika, muromo we micro-morphological we shear interface, uye pamusoro pemuenzaniso.
Magadzirirwo emabhurugwa makuru uye madiki diki e20MnTiB ane simba guru munzvimbo dzakasiyana dzengura dzakaedzwa (500×): (a) hapana ngura; (b) kamwe chete; (c) 20 ×; (d) 200 ×; (e) pH3.5; (f) pH7.5; (g) 50°C.
Zvinogona kuonekwa kubva paMufananidzo 4 kuti kutyoka kwemuenzaniso we20MnTiB une simba guru resimbi yekuora pasi pemamiriro akasiyana-siyana ekuora kwakaenzaniswa kunoratidza kutyoka kwakajairika kwekapu nekoni. Kana tichienzanisa nemuenzaniso usina kuora (Mufananidzo 4a), nzvimbo yepakati penzvimbo yefiber yakapwanyika idiki. , nzvimbo yekucheka miromo yakakura. Izvi zvinoratidza kuti hunhu hwezvinhu zvinokuvadzwa zvakanyanya mushure mekuora. Nekuwedzera kwehuwandu hwemhinduro yekuora yakaenzaniswa, makomba ari munzvimbo yefiber pakati pekutyoka akawedzera, uye mitsetse yekubvaruka yakajeka yakaonekwa. Kana huwandu hwacho hwakawedzera kusvika ka20 pane mhinduro yekutanga yekuora, makomba ekuputika akaonekwa panzvimbo iri pakati pemucheto wemuromo wekucheka nepamusoro pemuenzaniso, uye pakanga paine zvigadzirwa zvakawanda zvekuora pamusoro pemuenzaniso.
Kubva paMufananidzo 3d zvinofungidzirwa kuti kune mitswe iri pachena muchikamu chekuora pamusoro pemuenzaniso, izvo zvisina simba rekudzivirira pa matrix. Mumhinduro yekuora yakaedzwa yepH 3.5 (Mufananidzo 4e), pamusoro pemuenzaniso pane ngura zvakanyanya, uye nzvimbo yepakati pefiber iri pachena diki. , Kune huwandu hwakawanda hwemitsetse yekutsemuka isina kurongeka pakati penzvimbo yefiber. Nekuwedzera kwehuwandu hwepH yemhinduro yekuora yakaedzwa, nzvimbo yekutsemuka munzvimbo yefiber iri pakati pekutsemuka inoderera, gomba rinoderera zvishoma nezvishoma, uye kudzika kwegomba kunodererawo zvishoma nezvishoma.
Tembiricha payakakwira kusvika 50 °C (Mufananidzo 4g), nzvimbo yekucheka muromo wemuenzaniso ndiyo yakakura kupfuura dzose, makomba ari pakati pefiber akawedzera zvakanyanya, uye kudzika kwegomba kwakawedzerawo, uye kubatana pakati pemucheto wekucheka muromo nepamusoro pemuenzaniso kwakawedzera. Zvigadzirwa zvengura nemakomba zvakawedzera, izvo zvakasimbisa kudzika kweganda re substrate kunoratidzwa muMufananidzo 3f.
Kuwanda kwepH yemhinduro yekuora kuchakonzera kukuvara kwehunhu hwemakanika hwe20MnTiB high-strength bolts, asi mhedzisiro yacho haina kukosha. Mumhinduro yekuora yepH 3.5, huwandu hwakawanda hwezvigadzirwa zvekuora zvinoputika kana senge tsono zvinoparadzirwa pamusoro pemuenzaniso, uye ngura ine mitswe yakajeka, iyo isingakwanise kuumba dziviriro yakanaka ye substrate. Uye kune makomba ekuora akajeka uye huwandu hwakawanda hwezvigadzirwa zvekuora mu microscopic morphology yekuputsika kwemuenzaniso. Izvi zvinoratidza kuti kugona kwemuenzaniso kurwisa deformation nesimba rekunze kwakaderera zvakanyanya munzvimbo ine acidic, uye mwero wekuora kwezvinhu zvinomanikidzwa wakawedzera zvakanyanya.
Mhinduro yekutanga yekuora yakaedzwa haina kukanganisa zvakanyanya hunhu hwemakanika hwemasampuli ebhoti ane simba guru, asi sezvo huwandu hwemhinduro yekuora yakaedzwa hwakawedzera kusvika ka20 kupfuura mhinduro yekutanga yekuora, hunhu hwemakanika hwemasampuli hwakakuvara zvakanyanya, uye pakava nekuora kuri pachena mu microstructure yekuputsika, makomba, zvidimbu zvechipiri uye zvigadzirwa zvakawanda zvekuora. Apo huwandu hwemhinduro yekuora yakaedzwa hwakawedzerwa kubva ka20 kusvika ka200 huwandu hwemhinduro yekuora yakaedzwa, mhedzisiro yehuwandu hwemhinduro yekuora pahunhu hwemakanika hwechinhu chacho yakaderedzwa.
Kana tembiricha yekuora yakaedzwa iri 25℃, simba rekubereka uye simba rekudhonza re20MnTiB high-strength bolt sampuli hazvichinje zvakanyanya kana zvichienzaniswa nedzakasaora. Zvisinei, pasi petembiricha yekuora yakaedzwa ye50 °C, simba rekudhonza uye kureba kwemuenzaniso kwakadzikira zvakanyanya, chiyero chekupwanya chikamu chaive pedyo nemutengo wakajairwa, muromo wekupwanya wakapwanyika ndiwo waive mukuru, uye paive nemadimples munzvimbo yepakati pefiber. Yakawedzera zvakanyanya, kudzika kwegomba kwakawedzera, zvigadzirwa zvekuora uye makomba ekuora akawedzera. Izvi zvinoratidza kuti tembiricha yekubatana kweganda ine simba guru pahunhu hwemabhoti ane simba guru, izvo zvisingaonekwe patembiricha yemumba, asi zvinonyanya kukosha kana tembiricha yasvika 50 °C.
Mushure mekuedzwa kwekukurumidzisa ngura mukati meimba kutevedzera mamiriro ekunze muChongqing, simba rekukwesha, simba rekukura, kureba uye zvimwe zvikamu zvemabhaudhi e20MnTiB ane simba guru zvakaderedzwa, uye kukuvara kuri pachena kwekumanikidzwa kwakaitika. Sezvo zvinhu zviri pasi pekumanikidzwa, pachava nechiitiko chakakosha chekukurumidzisa ngura munzvimbo. Uye nekuda kwemhedzisiro yakabatana yekuwanda kwekumanikidzwa uye makomba ekuora, zviri nyore kukonzera kukuvara kwepurasitiki kuri pachena kumabhaudhi ane simba guru, kuderedza kugona kuramba kushanduka nemasimba ekunze, uye kuwedzera katsika kekuora kwekumanikidzwa.
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