Menene Duplex Karfe?

Duplex karfe yana nufin dangi na bakin karfe waɗanda ke da microstructure na zamani biyu wanda ya ƙunshi duka austenitic (tsarin tsarin cubic crystal na fuskar fuska) da ferritic (tsarin tsarin kristal mai matsakaicin jiki). Wannan tsari mai nau'i-nau'i biyu yana samuwa ta hanyar ƙayyadaddun kayan haɗin gwal wanda ya haɗa da abubuwa kamar chromium, nickel, molybdenum, da nitrogen.
Bakin karafa da aka fi sani da duplex na cikin jerin UNS S3XXX, inda “S” ke tsaye da bakin karfe, kuma lambobin suna nuna takamaiman abubuwan haɗin gwal. Tsarin microstructure na lokaci biyu yana ba da haɗe-haɗe na kyawawan kaddarorin, yin ƙarfe mai duplex wanda ya dace da aikace-aikace daban-daban. Wasu mahimman fasalulluka na karfen duplex sun haɗa da:
1.Corrosion Resistance: Duplex karfe yana ba da kyakkyawan juriya na lalata, musamman a cikin mummunan yanayi dauke da chlorides. Wannan ya sa ya dace don amfani da shi wajen sarrafa sinadarai, mai da iskar gas, da aikace-aikacen ruwa.
2.High Strength: Idan aka kwatanta da austenitic bakin karfe, duplex karfe yana da mafi girma ƙarfi, sa shi dace da aikace-aikace inda ƙara inji ƙarfi ake bukata.
3.Good Tauri da Ductility: Duplex karfe kula da kyau tauri da ductility, ko da a low yanayin zafi. Wannan haɗin kaddarorin yana da mahimmanci a aikace-aikace inda kayan za'a iya ɗaukar nauyin nauyi da yanayin zafi daban-daban.
4.Stress Corrosion Cracking Resistance: Duplex karfe yana nuna kyakkyawan juriya ga damuwa mai lalacewa, nau'in lalata wanda zai iya faruwa a ƙarƙashin tasirin haɗin gwiwar damuwa da kuma yanayin lalata.
5.Cost-Effective: Duk da yake duplex karfe iya zama mafi tsada fiye da na al'ada austenitic bakin karfe, ta yi halaye sau da yawa baratar da kudin, musamman a aikace-aikace inda lalata juriya da ƙarfi ne m.
Common duplex bakin karfe maki hada daDuplex 2205 (UNS S32205)da Duplex 2507 (UNS S32750). Ana amfani da waɗannan maki sosai a masana'antu kamar sarrafa sinadarai, binciken mai da iskar gas, injiniyan teku da na ruwa, da masana'anta da masana'anta.