Forgingsbayan quenching, martensite da retained austenite ne m, suna da wani maras lokaci kungiyar canji Trend zuwa kwanciyar hankali, irin su supersaturated carbon a martensite zuwa precipitate saura austenite bazuwa domin ya inganta motsi, kamar ga tempering tempering ne mara daidaituwa kungiyar zuwa daidaita da kungiyar ta atomization tafiyar matakai tare da wannan tsari na autization da aka kammala dogara a kan tafiyar matakai, tare da wannan tsari. zafin wuta ya fi girma, saurin watsawa da sauri; Akasin haka, tare da haɓakar zafin jiki, tsarin quenching na forgings zai sha jerin canje-canje. Bisa ga halin da ake ciki na microstructure canji, tempering ne kullum zuwa kashi hudu matakai: martensite bazuwa, saura austenite bazuwa, carbide tara girma da ferrite recrystallization.
Matakin farko (200)
(1) ƙirƙiratempering martensite bazu a karkashin 80 zafin jiki tempering, quenching karfe ba tare da Ming S kungiyar canji, da abin da ya faru na carbon a martensite kawai partial, kuma babu fara rushewa a cikin 80-200 tempering, martensite fara bazuwa, hazo musamman da dabara carbides, rage taro juzu'i na martensite da low zafin jiki a cikin wannan mataki. hazo kawai wani ɓangare na supersaturated carbon atom, don haka shi ne har yanzu da carbon a - Fe supersaturated m bayaniHazo na sosai lafiya carbide uniformly rarraba a cikin matrix na martensite. Tsarin gauraye na ƙarancin jikewa Martensite da ingantaccen carbide ana kiransa Martensite mai zafi.

(2)ƙirƙiratempering a mataki na biyu (200-300), da saura austenite bazuwar lokacin da zafin jiki ya tashi zuwa 200-300, da bazuwar martensite ci gaba, amma rinjaye canji ne saura austenite bazuwar na saura austenite bazuwar ya ta hanyar fadada na carbon zarra ta samar da wani m yankin, da kuma lokaci bazuwar da carbpha tsari a cikin wani m yanki, da kuma lokaci bazuwar kungiyar. Bainite karfe taurin ba a fili ya ragu a wannan mataki
(3)Mataki na uku (250-400) canjin carbide na ƙirƙira tempering yana cikin wannan kewayon zafin jiki. Saboda yawan zafin jiki, ƙarfin watsawa na carbon zarra ya fi ƙarfi, ikon watsawa don dawo da atom ɗin ƙarfe kuma, martensite bazuwar canjin hazo carbides da ragowar austenite bazuwar za a juya zuwa siminti mai ingantacciyar siminti tare da rabuwa da canzawar carbides, raguwar martensite a cikin ƙwayar carbon, ɓarkewar martenstor don juzu'i, ɓarna dillalan dillalai. sami ferritic matrix rarraba a cikin ƙananan granular ko lamellar cementite na kungiyar, kungiyar da ake kira tempering m kawar da wannan lokaci austenite quenching danniya, taurin, plasticity taurin da aka inganta.

(4)Mataki na hudu na ƙirƙira tempering (& GT; 400) girma carbide tattara da recrystallization na ferrite saboda tempering zafin jiki ne sosai high, carbon da baƙin ƙarfe atoms da karfi ikon yaduwa, na uku lokaci samuwar cimentite flakes zai ci gaba da spheroidizing da girma a cikin fiye da 500-600, alpha sannu-sannu ya faru ko morphoid morphology, farantin recrystallization da tsiri na asali. samar da polygon hatsi rarraba a kan kungiyar a matsayin ferritic matrix granular carbides, kungiyar da ake kira tempering sorbite tempered sorbite tare da mai kyau m inji Properties na lokaci da lattice murdiya kawar da ciki danniya.

(daga 168 ƙirƙira net)