Duplex zitsulo zosapanga dzimbiri zimakhala ndi magawo awiri a microstructure momwe gawo la voliyumu la ferrite ndi austenite liri pafupi 50%.Chifukwa cha microstructure yawo ya magawo awiri, zitsulozi zimagwirizanitsa zinthu zabwino kwambiri zazitsulo zosapanga dzimbiri za ferritic ndi austenitic. (nkhope yapakati pa cubic lattice) imapereka ductility yabwino.
Kuphatikiza kwa zinthuzi ndi chifukwa chake zitsulo zosapanga dzimbiri za duplex zimagwiritsidwa ntchito kwambiri mu petrochemical, zamkati ndi mapepala, m'madzi ndi mafakitale opanga magetsi.Amatha kupirira zowononga zowonongeka, kuwonjezera nthawi yautumiki, ndikugwira ntchito m'malo ovuta kwambiri a chilengedwe.
Zida zamphamvu kwambiri zimakulolani kuti muchepetse makulidwe a gawo ndi kulemera kwake.Mwachitsanzo, chitsulo chosapanga dzimbiri cha super duplex chingapereke mphamvu zokolola katatu kapena kanayi komanso kukana kwapamwamba kwa pitting corrosion kuposa 316 zitsulo zosapanga dzimbiri.
Zitsulo zosapanga dzimbiri za Duplex zimagawidwa m'makalasi atatu kutengera zomwe zili ndi gravimetric chromium (Cr) ndi nambala yofananira ndi pitting resistance (PREN):
Chimodzi mwazinthu zofunikira pakuwotcherera DSS, SDSS, HDSS ndi zitsulo zapadera za aloyi zosapanga dzimbiri ndikuwongolera magawo owotcherera.
Zofunikira pakuwotcherera kwa mafakitale a petrochemical zimatsimikizira mtengo wochepera wa PREN wofunikira pazitsulo zodzaza.Mwachitsanzo, DSS imafuna PREN ya 35 ndipo SDSS imafuna PREN ya 40.Figure 1 ikuwonetsa DSS ndi zitsulo zake zofananira zodzaza GMAW ndi GTAW.Mwachizoloŵezi, Cr zomwe zili muzitsulo zodzaza zidzafanana ndi zomwe zimagwiritsidwa ntchito pogwiritsira ntchito zitsulo za GTA ndikugwiritsa ntchito GTA. Ngati chitsulo chowotcherera sichili yunifolomu chifukwa cha luso losakwanira, zitsulo zodzaza ndi alloyed zimatha kupereka PREN yofunidwa ndi zinthu zina zachitsanzo chowotcherera.
Monga chitsanzo kusonyeza izi, opanga ena amalimbikitsa kugwiritsa ntchito SDSS filler wire (25% Cr) kwa DSS-based alloys (22% Cr), ndi HDSS filler waya (27% Cr) mu SDSS (25% Cr) zochokera alloys. Pakuti HDSS based alloys, mutha kugwiritsanso ntchito HDSS filler waya. 27% chromium, 6.5% faifi tambala, 5% molybdenum ndipo amaonedwa kuti ndi osachepera 0.015% carbon low.
Poyerekeza ndi SDSS, HDSS kulongedza kuli ndi mphamvu zokolola zambiri komanso kukana kwabwino kwa pitting ndi corrosion corrosion. Imakhalanso ndi kukana kwakukulu kwa kuwonongeka kwa hydrogen-induced stressing ndi kukana kwakukulu kwa malo a acidic kwambiri kuposa SDSS.
Poganizira kuchuluka kwa zida zoyambira, zofunikira zamakina ndi magwiridwe antchito, chonde ganizirani kufunsana ndi pulogalamu ya DSS komanso katswiri wazodzaza zitsulo musanayambe ntchito yotsatira.
WELDER, yemwe kale ankatchedwa Practical Welding Today, akusonyeza anthu enieni amene amapanga zinthu zimene timagwiritsa ntchito komanso ntchito tsiku lililonse. Magaziniyi yakhala ikuthandiza anthu ku North America kwa zaka 20.
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