Duplex simbi isina tsvina ine maviri-phase microstructure, umo vhoriyamu chikamu cheferrite uye austenite chinenge 50%. Nekuda kweiyo miviri-chikamu microstructure, simbi idzi dzinobatanidza zvakanakisa zvivakwa zveferritic uye austenitic simbi isina tsvina. Kazhinji, chikamu cheferritic (body-centered cubic lattice) inopa simba rakakwirira remuchina, kusimba kwakanaka uye kunaka kwekudzivirira kwemarara, nepo austenitic phase (face-centered cubic lattice) inopa yakanaka ductility.
Nekuda kwekubatanidzwa kwezvinhu izvi, duplex simbi isina tsvina inoshandiswa zvakanyanya mu petrochemical, pulp uye mapepa, marine uye simba maindasitiri. Vanogona kumira munzvimbo dzakaoma, kuwedzera hupenyu hwesevhisi uye kushanda mumamiriro ekunze akanyanya.
Zvinhu zvepamusoro-simba zvinoderedza kuwanda uye uremu hwechikamu. Semuenzaniso, super duplex simbi isina tsvina inogona kupa katatu kana mana simba regoho uye pitting kuramba kwe316 simbi isina tsvina.
Duplex simbi isina tsvina inoiswa muzvikamu zvitatu zvichienderana negiravimetric chromium (Cr) zvirimo uye pitting kuramba yakaenzana nhamba (PREN):
Chimwe chezvinhu zvakakosha zveWelding DSS, SDSS, HDSS uye yakakosha alloy Stainless simbi kutonga kwewelding paramita.
Izvo zvinodikanwa zvewelding process muindasitiri yepetrochemical inoraira iyo shoma PREN inodiwa kune filler simbi. Semuenzaniso, DSS inoda PREN kukosha kwe35, nepo SDSS inoda kukosha kwePREN ye 40. 1 inoratidza DSS uye inopindirana nesimbi yekuzadza GMAW neGTAW. Sezvo mutemo, iyo Cr yemukati mune yekuzadza simbi inofanana neiyo Cr yemukati mune base simbi. Imwe nzira yekufunga kana uchishandisa GTAW yemidzi uye inopisa chiteshi ndeye kushandiswa kwe superalloy filler simbi. Kana iyo weld simbi isiri homogeneous nekuda kwemaitiro asina kunaka, simbi yakawandisa-yakasanganiswa yekuzadza inogona kupa inodiwa PREN uye humwe hunhu hweiyo weld specimen.
Semuenzaniso, kuratidza izvi, vamwe vagadziri vanokurudzira kushandisa SDSS (25% Cr) waya yekuzadza DSS (22% Cr) yakavakirwa alloys uye HDSS (27% Cr) waya yekuzadza yeSDSS (25% Cr) yakavakirwa alloys. HDSS filler waya inogona zvakare kushandiswa kune HDSS alloys. Iyi austenitic-ferritic duplex ine inenge 65% ferrite, 27% chromium, 6.5% nickel, 5% molybdenum uye inoonekwa seisingasviki 0.015% yakaderera kabhoni.
Kuenzaniswa neSDSS, HDSS kurongedza ine yakakwira goho simba uye zvirinani kuramba kugomba uye crevice corrosion. Iyo ine zvakare yakakwira yekupokana kune hydrogen kusagadzikana kupaza uye yakakwirira kuramba kune yakasimba acidic nharaunda kupfuura SDSS. Simba rayo rakakwirira rinoreva kuderera kwekugadzirisa mari mukugadzirwa kwepombi, sezvo weld simbi yesimba rakakwana isingade magumo ekuongorora uye maitiro ekugamuchira anogona kushoma kuchengetedza.
Tichifunga zvakasiyana-siyana zvezvigadziko, zvinodiwa zvemakanika uye mamiriro ekushanda, ndapota bvunza DSS uye filler simbi application nyanzvi usati waenderera mberi nepurojekiti yako inotevera.
WELDER, yaimbonzi Practical Welding Nhasi, inomiririra vanhu chaivo vanogadzira zvigadzirwa zvatinoshandisa uye kushanda nazvo mazuva ese. Magazini ino yave ichishandira nharaunda yekuNorth America kwemakore anopfuura 20.
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