Chitsulo chosapanga dzimbiri cha Duplex chili ndi magawo awiri a microstructure, momwe gawo la ferrite ndi austenite lili ndi pafupifupi 50%.Chifukwa cha microstructure yawo ya magawo awiri, zitsulozi zimagwirizanitsa zinthu zabwino kwambiri za ferritic ndi austenitic zosapanga dzimbiri.Kawirikawiri, gawo la ferritic (lomwe lili pakati pa thupi la cubic lattice) limapereka mphamvu zamakina apamwamba, kulimba kwabwino komanso kukana kwa dzimbiri, pamene gawo la austenitic (nkhope ya cubic lattice) imapereka ductility yabwino.
Chifukwa cha kuphatikiza kwa zinthuzi, zitsulo zosapanga dzimbiri za duplex zimagwiritsidwa ntchito kwambiri mu petrochemical, zamkati ndi mapepala, mafakitale apanyanja ndi mphamvu.Amatha kupirira malo ovuta, kuwonjezera moyo wautumiki ndikugwira ntchito m'malo ovuta kwambiri.
Zida zamphamvu kwambiri zimachepetsa makulidwe ndi kulemera kwa gawolo.Mwachitsanzo, super duplex zitsulo zosapanga dzimbiri zimatha kupereka katatu kapena kanayi mphamvu zokolola komanso kukana kwa 316 chitsulo chosapanga 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 zazikulu za kuwotcherera DSS, SDSS, HDSS ndi zitsulo zapadera za aloyi zosapanga dzimbiri ndikuwongolera magawo owotcherera.
Zofunikira pakuwotcherera mumakampani a petrochemical zimatengera PREN yocheperako yofunikira pazitsulo zodzaza.Mwachitsanzo, DSS imafuna mtengo wa PREN wa 35, pamene SDSS imafuna mtengo wa PREN wa 40. 1 imasonyeza DSS ndi zitsulo zofananira zodzaza GMAW ndi GTAW.Monga lamulo, zomwe Cr zili muzitsulo zodzaza zimagwirizana ndi Cr zomwe zili muzitsulo zoyambira.Njira imodzi yoganizira mukamagwiritsa ntchito GTAW yamizu ndi njira zotentha ndikugwiritsa ntchito zitsulo zodzaza ndi superalloy.Ngati chitsulo chowotchereracho sichinaphatikizidwe chifukwa cha luso losauka, zitsulo zodzaza ndi alloyed zimatha kupereka PREN yofunidwa ndi zinthu zina zamtundu wa weld.
Mwachitsanzo, kuti awonetse izi, opanga ena amalimbikitsa kugwiritsa ntchito waya wa SDSS (25% Cr) wa ma aloyi opangidwa ndi DSS (22% Cr) ndi waya wa HDSS (27% Cr) wa ma aloyi a SDSS (25% Cr).Waya wa HDSS filler itha kugwiritsidwanso ntchito pazitsulo za HDSS.Duplex iyi ya austenitic-ferritic ili ndi pafupifupi 65% ferrite, 27% chromium, 6.5% nickel, 5% molybdenum ndipo imawonedwa kuti ndi yochepera 0.015% ya carbon dioxide.
Poyerekeza ndi SDSS, HDSS kulongedza katundu ali ndi mphamvu zokolola zambiri komanso kukana bwino pobowola ndi dzimbiri.Ilinso ndi kukana kwambiri kusweka kwa hydrogen stress komanso kukana kwambiri kumadera a acidic kwambiri kuposa SDSS.Mphamvu zake zazikulu zimatanthawuza kutsika kwa mtengo wokonza popanga chitoliro, chifukwa chitsulo chowotcherera chokhala ndi mphamvu zokwanira sichifuna kusanthula kwazinthu zocheperako komanso njira zovomerezera zitha kukhala zocheperako.
Poganizira kuchuluka kwa zida zoyambira, zofunikira zamakina ndi momwe amagwirira ntchito, chonde funsani ndi DSS ndi katswiri wogwiritsa ntchito zitsulo zodzaza musanayambe ntchito yotsatira.
WELDER, yemwe kale ankatchedwa Practical Welding Today, amaimira anthu enieni omwe amapanga zinthu zomwe timagwiritsa ntchito ndikugwira nazo ntchito tsiku lililonse.Magaziniyi yakhala ikugwira ntchito yowotchera zinthu ku North America kwa zaka zoposa 20.
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