Karfe na crankshaft C38N2 sabon nau'in microalloyed ne wanda ba'a kashe shi kuma mai zafi, wanda ke maye gurbin karfen da aka kashe don kera injinan injin Renault. Lalacewar layin gashin saman ƙasa sune lahani na yau da kullun a cikin rayuwar crankshafts, galibi suna haifar da lahani na ƙarfe kamar pores da sako-sako a cikin asalin ingot ɗin da aka matse daga ainihin zuwa saman yayin aikin ƙirƙira mutu. Inganta ingancin mahimmancin kayan aikin crankshaft ya zama manufa mai mahimmanci a cikin tsarin mirgina. Ta hanyar rage laushin izinin wucewa yayin aikin birgima, da haɓaka nakasar ainihin hanya ce mai kyau don sassautawa da raguwar ainihin simintin simintin welded.

Masanan daga Jami'ar Kimiyya da Fasaha ta Beijing sun yi nazari kan illolin inganta yanayin, yanayin zafi na nakasawa, ƙimar nakasar, adadin nakasar, da wuce tazara a kan ƙarfen C38N2 wanda ba ya ƙarewa da mirgina na crankshafts ta hanyar gwaje-gwajen siminti na thermal, ƙirar ƙirar gani da watsawa. electron microscope lura. Dokokin tasiri na juzu'in juzu'i na recrystallization a tsaye da ragowar matsananciyar wahala tsakanin wucewa.

Sakamakon gwaji ya nuna cewa tare da karuwar zafin nakasawa, ƙimar nakasar, adadin nakasu ko lokacin tsaka-tsaki tsakanin wucewar, ƙarar juzu'i na recrystallization a tsaye yana ƙaruwa a hankali, kuma ragowar raguwar ƙimar wucewa yana raguwa. ; Girman hatsi na asali na austenite yana ƙaruwa, kuma juzu'in juzu'i na recrystallization yana raguwa, amma canjin ba shi da mahimmanci; kasa da 1250 ℃, tare da austenitizing zafin jiki karuwa, da static recrystallization girma juzu'i ba ya ragu sosai, amma Sama da 1250 ℃, karuwa na austenitizing zafin jiki a fili yana rage a tsaye recrystallization girma juzu'i. Ta hanyar dacewa da madaidaiciyar hanyar madaidaiciya da ƙananan murabba'ai, ana samun ƙirar lissafi na alaƙa tsakanin juzu'in juzu'i na recrystallization na juzu'i da sigogin tsarin lalacewa daban-daban; An sake duba samfurin lissafin ƙimar saura da ke akwai, kuma ana samun samfurin lissafin ƙimar saura da ke ƙunshe da lokacin ƙimar iri. Kyakkyawan dacewa.