Dangane da matakin abun ciki na carbon, carbon karfe donyin simintin gyare-gyaregabaɗaya an raba shi zuwa ƙananan ƙarfe na carbon, matsakaicin carbon karfe da babban carbon karfe. Nau'in simintin carbon carbon na duk ƙasashe na duniya gabaɗaya ana rarraba su gwargwadon ƙarfinsu, kuma an ƙirƙira maki daidai.
Game da sinadarai na karfe carbon, ban da phosphorus da sulfur, babu hani ko iyaka kawai akan sauran abubuwan sinadarai. Ƙarƙashin jigon da ke sama, simintin simintin simintin gyare-gyaren carbon karfe an ƙaddara tatushebisa ga kayan aikin injiniya da ake buƙata.
Hanyoyin maganin zafi na simintin ƙarfe na carbon yawanci suna daɗaɗawa, daidaitawa ko daidaitawa + tempering. Don wasu manyan simintin ƙarfe na carbon karfe, ana iya amfani da quenching da tempering, wato, quenching + high zafin jiki tempering, don inganta ingantattun kayan aikin injiniya na simintin ƙarfe na carbon karfe. Kananan simintin gyare-gyare na carbon karfe ana iya kashe shi kai tsaye kuma a huce shi daga yanayin simintin. Don simintin gyare-gyaren carbon karfe babba ko hadaddun siffa, ya dace a yi quenching da jin zafi bayan daidaita jiyya.
Tasirin carbon akan microstructure da kaddarorin carbon karfe
1) Tasirin carbon akan tsarin carbon karfe
Carbon shine babban kashi wanda ke ƙayyade tsarin ƙarfe da kaddarorin ƙarfe. A cikin kewayon ƙarfe na hypoeutectoid, yayin da abun cikin carbon ya karu, adadin dangi na ferrite yana raguwa kuma adadin dangi na pearlite yana ƙaruwa. Lokacin isa abun da ke ciki na eutectoid, duk pearlite ne. A cikin kewayon hypereutectoid, yayin da abun cikin carbon ya karu, adadin dangi na siminti proeutectoid yana ƙaruwa kuma adadin dangi na pearlite yana raguwa.
2) Tasirin carbon akan kayan aikin injiniya na carbon karfe
Carbon yana shafar kaddarorin injina na ƙarfe na carbon ta hanyar shafar ƙimar dangi da halayen rarraba kowane ɓangaren tsarin a cikin ƙaramin tsari. Gabaɗaya, yayin da abun ciki na carbon ya karu, taurin carbon karfe zai karu, amma tasirin tasirinsa da haɓakawa zai ragu. Ƙarfin juzu'i da ƙarfin amfanin ƙasa zai fara haɓaka sannan kuma ya ragu yayin da abun cikin carbon a cikin ƙarfe na carbon ke ƙaruwa.
3) Tasirin carbon akan yankan aikin simintin ƙarfe na carbon karfe
Ƙarfe mai ƙarancin carbon yana da adadi mai yawa na ferrite, ƙananan tauri, filastik mai kyau, da kuma mai sauƙi mai sauƙi, don haka yanke aikin sa ba shi da kyau. Akwai ƙarin siminti a cikin babban ƙarfe na carbon. Lokacin da aka rarraba siminti a cikin flake da cibiyar sadarwa, kayan aiki yana da sauƙi don sawa, don haka aikin yankan ya kasance mara kyau. Matsakaicin ferrite da cementite a cikin matsakaicin ƙarfe na carbon ya dace, taurin da filastik kuma suna da matsakaici, kuma aikin yanke ya fi kyau. Ayyukan yankan shine mafi kyawun lokacin da taurin kewayon simintin ƙarfe shine 180-230 HBW.
4) Tasirin carbon akan aikin simintin ƙarfe na carbon karfe
A daidai wannan zafin jiki, ruwan narkakkar karfe tare da abun ciki na carbon daban-daban ya bambanta. Domin karafa masu abun ciki na carbon daban-daban suna da digiri daban-daban na haɓakawa a cikin dendrites. Mafi girman tazarar zafin jiki na yankin crystallization (bambancin zafin jiki tsakanin layin liquidus da layin solidus), da ƙarin haɓaka lu'ulu'u na dendritic na carbon karfe, wato, mafi muni da ruwa na narkakkar karfe, wanda ke haifar da ikon narkakkar karfe don cika mold.
