Menene fashewar walda?Ita ce mafi yawan lahani mai tsanani a cikin walda.A karkashin aikin haɗin gwiwa na damuwa na walda da sauran abubuwan fashewa, haɗin haɗin ƙarfe na atom ɗin ƙarfe a cikin yanki na haɗin gwiwa yana lalata kuma an kafa sabon haɗin gwiwa.A fasahar walda, ya kamata mu guji fasa walda.
Zafafan tsagewar walda:
Ana haifar da fashewar zafi a ƙarƙashin yanayin zafi mai zafi, daga zafin jiki mai ƙarfi zuwa yanayin zafi sama da A3, don haka ana kiran su tsagewar zafi, wanda kuma ake kira babban zafin jiki.Yadda za a hana zafi fasa?Kamar yadda samar da zafi mai zafi yana da alaƙa da abubuwan damuwa, hanyoyin rigakafin yakamata su fara daga bangarori biyu na zaɓin kayan abu da tsarin walda.
Sanyin fasa walda:
Ana haifar da fashewar sanyi a lokacin ko bayan walda, a ƙananan zafin jiki, a kusa da yanayin canjin martensite (watau Ms point) na ƙarfe, ko kuma a kewayon zafin jiki a ƙasa 300 ~ 200 ℃ (ko T ＜ 0.5Tm, Tm shine yanayin zafi mai narkewa). wanda aka bayyana a cikin cikakken zafin jiki), don haka ana kiran su fashe masu sanyi.
Maimaita tsagewar walda:
Ƙunƙarar sake zafi tana nufin haɗin gwiwar welded na wasu ƙananan ƙarfe masu ƙarfi masu ƙarfi da ƙarfe masu jure zafi masu ɗauke da vanadium, chromium, molybdenum, boron da sauran abubuwan gami.A lokacin aikin dumama (kamar damuwa na rage damuwa, Multi-Layer da Multipass waldi, da kuma aikin zafi mai zafi), fashewar da ke faruwa a cikin ƙananan hatsi na yankin da zafi ya shafa da kuma fashewa tare da ainihin iyakar hatsi austenite kuma ana kiransa danniya. ɓangarorin ɓacin rai (SR cracks).
Akwai dalilai da yawa da ke haifar da tsagewar walda, amma ko mene ne dalili, muddin aka kula da hanyoyin rigakafin, za a iya rage yawan hadurran da ake samu a lokacin walda.
Lokacin aikawa: Satumba-20-2022