Tsarin spheroidizing na al’ada da matsalolin da ke akwai

Na gargajiya spheroidizing jiyya ya kasu zuwa matakai biyu masu zuwa.

(1) A cikin shirye-shiryen shirye-shiryen spheroidization, ƙarfe da za a zubar da shi kuma annealed yana da zafi zuwa 30-50 ° C sama da mahimmin mahimmin kuma an riƙe shi tsawon awanni 1 zuwa 2 don austenitization, don haka carbides sun narke cikin austenite. Sannan ana sanyaya shi cikin sauri zuwa ƙasa da mahimmin maƙasudin Ac don samun hatsin kristal mai kyau da tsaftace carbides don sauƙaƙe spheroidization na gaba. Tace hatsi da tsaftace carbides suna haifar da yanayi don sassaucin spheroidization, don haka ana kiran wannan matakin matakin shiri na spheroidization. Yawancin lokaci, matakin shirye -shiryen spheroidization yana farawa daga dumama ƙarfe zuwa 850 ~ 900 ° C da riƙe shi don 1 ~ 2h, wanda ke ɗaukar kusan awanni goma.

(2) A matakin spheroidizing, an ƙera ƙarfe kuma an sanyaya shi zuwa 700 ~ 750 ° C kuma an ajiye shi na kusan awanni 10, ta yadda carbides da aka tace za su samar da carbides mai siffa ta hanyar haɗin kai da watsawa, kammala aikin spheroidizing da annealing.

Daga tsarin aikin spheroidization na sama, ana iya kammala shi cewa ƙarfe eutectoid da ƙarfe hypereutectoid tare da abun cikin carbon mafi girma, a ƙarƙashin aikin babban zafin jiki na dogon lokaci, da farko yana haifar da oxyidation da decarburization na saman karfe, wanda ke rage ingancin farfajiyar karfe; Tsarin adana zafi na lokaci yana ƙara yawan kuzarin ku kuma yana rage ingancin samarwa. Sabili da haka, ana fatan za a iya yin nazarin saurin ɓarkewar ɓarkewar ɓarkewar ɓarkewar cutar don rage taɓarɓarewar ɓarna da inganta ingancin farfajiyar.