Canje-canje a cikin microstructure da kaddarorin abubuwan da aka yafe yayin fitina

Alkalaibayan shafewa, martensite da riƙe austenite ba shi da tabbas, suna da wata ƙungiya canjin yanayin canji zuwa kwanciyar hankali, kamar carbon da aka zana a cikin martensite don tayar da ragowar lalata abubuwa don inganta motsi, kamar don ɗora iska mai ƙarfi ƙungiyar ba ta daidaitawa ba don daidaita ayyukan kungiyar, wannan tsari ya dogara ne akan ƙaura na atomic da watsa wannan izini tare da kammalawar zazzabi na wuta mafi girma, da saurin watsawa da sauri; akasin haka, tare da ƙaruwa da zafin zafin jiki, tsarin ƙonewa na bututun zai gudanar da jerin canje-canje. Dangane da halin da ake ciki na kawo canji na microstructure, tempering an rarraba shi gabaɗaya zuwa matakai huɗu: ɓarnawar martensite, ginin ɗakunawar saura, hauhawar haɓakar carbide da ingantaccen aikin recrystallization.
A mataki na farko (200)
(1) sunã ƙirƙirãwa tempering martensite decompose karkashin 80 zazzabi tempering, quenching karfe ba tare da Ming S kungiyar canji, da ya faru na carbon a martensite kawai m, kuma ba ya fara karya saukar a cikin 80-200 tempering, martensite fara to decompose, precipitate musamman da dabara carbides, rage taro na martensite a carbon forgings a cikin wannan mataki, saboda da low tempering zazzabi, martensitic hazo kawai wani ɓangare na supersaturated carbon atoms, don haka shi ne har yanzu carbon a cikin - Fe supersaturated m bayaniTheThe hazo sosai lafiya carbide daidai rarraba a cikin matrix na martensite. Tsarin hadewar maras matattari mai kyawu kuma yana da kyau carbide ana kiransa da zafin Martensite.

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(2) sunã ƙirƙirãwa tempering a cikin mataki na biyu (200-300), da saura austenite bazuwar lokacin da yawan zafin jiki ya tashi zuwa 200-300, da bazuwar na martensite ci gaba, amma da rinjaye canji ne saura austenite bazuwar daga cikin saura austenite bazuwar ne, ta hanyar da fadada tarin kwayoyin carbon don samar da yanki mai bangaranci, sannan kuma ya rushe cikin wani yanayi na alfa da cakuda kungiyar carbide, wato kasancewar karuwar karfe bainite ba a fili ya ragu a wannan matakin
(3) Mataki na uku (250-400) canjin carbide na hana tashin hankali yana cikin wannan yanayin zazzabi. Saboda yawan zafin jiki, Carbon atom zarra ikon ya fi karfi, yaduwa ikon dawo da baƙin ƙarfe kuma, martensite bazuwar miƙa mulki na carbides da ragowar austenite bazuwar za a juya zuwa cikin barga kwanciyar hankali cementite tare da rabuwa da canji na carbides, raguwa na martensite a cikin carbon taro juzu'i, martensite lattice murdiya bace, martensitic canji ga ferrite, samun ferritic matrix rarraba a cikin karamin granular ko lamellar cementite na kungiyar, kungiyar da ake kira tempering mabuɗin kawar da wannan lokaci austenite quenching danniya, taurin, plasticity wuya aka inganta

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(4) Mataki na huɗu na lalata iska (& GT; 400) girma carbide tattara da recrystallization na ferrite saboda zafin jiki mai zafi sosai, carbon da atom baƙin ƙarfe suna da ƙarfin haɓakawa, kashi na uku na samar da laka na teku zai ci gaba spheroidizing da girma a cikin fiye da 500-600, alpha recrystallization faruwa a hankali, rasa ferrite ilimin halittar na farantin farantin farantin ko takardar, da kuma samar da polygon hatsi rarraba a kan kungiyar kamar yadda ferritic matrix granular carbides, kungiyar da ake kira tempering sorbite temred sorbite da kyawawan kayan kwalliyar kayan aiki na lokaci da murɗaɗɗar lattice suna kawar da damuwa na ciki.

(Daga shekara 168


Lokacin aikawa: Aug-05-2020

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