Rashin cikar cirewar simintin ƙarfe
Ma'anar:
Rashin cikawa annealing shine azafi magani tsari ga karfe simintin gyaran kafa, wanda ya ƙunshi dumama karfe zuwa kewayon zafin jiki tsakanin Ac1 da Ac3 (na hypoeutectoid karfe) ko Ac1 da Accm (na hypereutectoid karfe), sanyaya shi a jinkirin sanyaya kasa da 50 ℃ / h bayan rike shi har sai zafin jiki ya ragu. kasa da 500 ℃ sannan a fitar da shi daga cikin tanderun don sanyaya iska. Wannan tsari yana nufin samun tsari kusa da yanayin daidaito.
Halayen tantancewa:
Tun da zafin jiki mai zafi yana cikin yanki na biyu, tsarin karfe ba a canza shi gaba daya zuwa austenite ba. Sashin pearlite ne kawai ke jujjuya canjin lokaci da recrystallization, yana canzawa zuwa austenite, yayin da ilimin halittar jiki da rarraba proeutectoid ferrite ko siminti ya kasance baya canzawa.
Aikace-aikace:
Ana amfani da rashin cikawa annealing galibi azaman hanyar magancewa kafin kashe karfen hypereutectoid, kuma aikace-aikacen sa a cikin ƙarfen hypoeutectoid ba ya da yawa.
Spheroidizing annealing na Karfe Castings
Ma'anar:
Sperosizing akiming akiming tsari ne na magani mai zafi wanda ke da nufin yin carbides a cikin karfe samar da barbashi mai fa'ida, don haka samun tsarin lu'u-lu'u mai girma. A gaskiya ma, wani nau'i ne na rashin cikawa.
Aikace-aikace:
Wannan tsari ne yafi amfani da eutectoid karfe, hypereutectoid karfe dagami kayan aiki karfe simintin gyaran kafa, da nufin rage taurin kayan, inganta aikin yankan, tabbatar da tsari iri ɗaya, inganta aikin tsarin kula da zafi, da kuma shimfiɗa tushe mai kyau na ƙungiya don tsarin kashewa na gaba.
Cikakkun bayanai:
Ana buƙatar sarrafa zafin zafin jiki daidai, yawanci sama da zafin AC1 da 20 zuwa 30 ° C, kuma ana ɗaukar hanyar dumama tanderu.
Lokacin riƙewa bai kamata ya yi tsayi da yawa ba, gabaɗaya ana kiyaye shi tsakanin awanni 2 zuwa 4.
Akwai hanyoyi daban-daban na sanyaya, amma sanyaya tanderu ko kuma dogon lokaci na isothermal magani a kusan 20 ° C a ƙarƙashin Ar1 hanya ce ta gama gari.
Makullin don spheroidizing annealing shine tabbatar da cewa an riƙe isassun adadin abubuwan da ba a narkar da su ba a cikin austenite, wanda ke haifar da rarraba rarrabawar carbon da bai dace ba don haɓaka spheroidization na carbide.
Dumama a matsanancin zafin jiki ko riƙewa na dogon lokaci zai haifar da babban adadin carbide don narkewa, samar da austenite uniform, rage spheroidization core kuma yana shafar tasirin spheroidization.
Siffa da girman siminti barbashi suna shafar yanayin sanyaya ko zafin jiki na isothermal. Saurin sanyaya ko ƙananan zafin jiki na isothermal yana da sauƙi don samar da carbides mai laushi, yana haifar da ƙara taurin.
Mafi yawan amfani da spheroidizing annealing matakai:
Guda guda spheroidizing annealing:
dumama zuwa 20-30 ℃ sama da Ac1, sannu a hankali sanyaya zuwa kasa 600 ℃ bayan dumama, sa'an nan iska sanyaya daga cikin tanderu.
Isothermal spheroidizing annealing:
dumama zuwa 20-30 ℃ sama da Ac1, da sauri sanyaya zuwa kusan 20 ℃ kasa Ar1 bayan kiyaye dumi, sa'an nan sanyaya zuwa kasa 600 ℃ tare da tanderu da iska sanyaya daga cikin tanderu. Ana amfani da wannan tsari sosai.
Maimaitawa spheroidizing annealing:
dumama zuwa zafin jiki dan kadan sama da Ac1 na sau da yawa, sanyaya zuwa zafin jiki kadan ƙasa da Ar1 bayan dumama, sa'an nan kuma sanyaya iska har zuwa dakin zafin jiki don samun sakamako mai kyau na spheroidizing. Ya dace da simintin ƙarfe mai wahala-zuwa-spheroidize, amma aikin yana da rikitarwa.
Lokacin aikawa: Janairu-03-2025