Maganin zafi na sinadarai na simintin ƙarfe yana nufin sanya simintin gyare-gyare a cikin matsakaiciyar aiki a wani takamaiman zafin jiki don adana zafi, ta yadda abubuwa ɗaya ko da yawa zasu iya shiga saman. Maganin zafi na sinadarai na iya canza abubuwan sinadaran, tsarin ƙarfe da kayan aikin injiniya na saman simintin. Hanyoyin da ake amfani da su na kula da zafin jiki da yawa sun haɗa da carburizing, nitriding, carbonitriding, boronizing da metalizing. Lokacin yin maganin zafi na siminti akan simintin gyare-gyare, ya kamata a yi la'akari da siffa, girman, yanayin saman, da kuma kula da yanayin zafi sosai.
1. Carburizing
Carburizing yana nufin dumama da sanyawa simintin gyare-gyare a cikin matsakaicin carburizing, sa'an nan kuma kutsawa carbon atom zuwa saman. Babban manufar carburizing shine ƙara abun cikin carbon akan saman simintin, yayin da yake samar da wani nau'in abun ciki na carbon a cikin simintin. Abun cikin carbon na carburizing karfe shine gabaɗaya 0.1% -0.25% don tabbatar da cewa ainihin simintin yana da isasshen ƙarfi da ƙarfi.
Taurin saman saman carburized Layer shine gabaɗaya 56HRC-63HRC. Tsarin metallographic na carburized Layer shine kyakkyawan allura martensite + ƙaramin adadin da aka riƙe austenite kuma an rarraba su daidai gwargwado. Ba a yarda da carbide na cibiyar sadarwa ba, kuma juzu'in ƙarar austenite da aka riƙe gabaɗaya baya wuce 15% -20%.
Babban taurin simintin gyare-gyare bayan carburizing shine gabaɗaya 30HRC-45HRC. Babban tsarin ƙarfe ya kamata ya zama ƙaramin carbon martensite ko ƙananan bainite. Ba a yarda a sami ferrite mai girma ko hazo tare da iyakar hatsi.
A cikin ainihin samarwa, akwai hanyoyi guda uku na carburizing: m carburizing, ruwa carburizing da gas carburizing.
2. Nitriding
Nitriding yana nufin tsarin maganin zafi wanda ke kutsawa atom ɗin nitrogen zuwa saman simintin. Nitriding gabaɗaya ana yin shi a ƙasa da zafin jiki na Ac1, kuma babban manufarsa shine haɓaka taurin, sa juriya, ƙarfin gajiya, juriyar kamawa da juriyar lalata yanayin sararin samaniya. Nitriding na simintin karfe ana yin gabaɗaya a 480°C-580°C. Simintin gyare-gyaren da ke ƙunshe da aluminum, chromium, titanium, molybdenum, da tungsten, irin su ƙananan ƙarfe, bakin karfe, da kayan aiki mai zafi, sun dace da nitriding.
Domin tabbatar da cewa jigon simintin gyare-gyare yana da mahimman kaddarorin inji da tsarin ƙarfe, da kuma rage nakasar bayan nitriding, ana buƙatar riga-kafi kafin nitriding. Don ƙarfe na tsari, ana buƙatar quenching da maganin zafin jiki kafin nitriding don samun tsari iri ɗaya da lafiyayyen sorbite; don simintin gyare-gyaren da ke da sauƙi a gurɓata yayin jiyya na nitriding, ana kuma buƙatar maganin rage damuwa bayan quenching da tempering; don bakin karfe da simintin gyare-gyaren karfe na zafi gabaɗaya za a iya kashe shi da fushi don haɓaka tsari da ƙarfi; don austenitic bakin karfe, ana iya amfani da maganin zafi mai zafi.
Lokacin aikawa: Yuli-21-2021