Ƙungiya na ƙananan ƙarfe na carbon a ɗakin zafin jiki nakasar ferrite da pearlite, idan akwai tsarin band na ferrite da pearlite alternating ratsi kungiyar.Low carbon karfe sumul band tsarin, daga dakin zafin jiki zuwa normalizing zazzabi, lokacin da via Ac1 zafin jiki, da eutectoid canji ya auku, pearlite canji na austenite.A wannan yanayin, da aka gyara ba kama austenite, tare da dumama zafin jiki ya wuce Ac3, ferrite m bayani da aka kammala, sa'an nan da tsarin na karfe an tuba zuwa guda-lokaci austenite, kamar yadda zafin jiki ya ci gaba da karuwa da normalizing zafin jiki shiryawa, da austenite gaba daya uniform.

An sake shi daga yanayin sanyaya yanayin daidaitawa Bayan shiryawa, lokacin da yawan sanyaya ƙarfe don kawar da babban tsari mai ban sha'awa tare da ƙimar sanyaya mai mahimmanci (watau suppression ferrite precipitate daga ma'aunin sanyaya austenite), an kashe jikin bututun ƙarfe eutectoid ferrite, don haka ferrite ba ya hazo da cire sauran sauran ƙarfi a cikin austenite, kuma yayin da yawan zafin jiki ya ragu ta hanyar haɓaka digiri na supercooling, kuma ba zai sake faruwa ba precipitated pro-eutectoid ferrite, ta kai tsaye supercooled austenite bazuwar samfurin cikin eutectoid ferrite + cementite, amma sabanin eutectoid. karfe abun da ke ciki, da ake kira "pseudo-eutectoid" saboda "pseudo-eutectoid" babu eutectoid ferrite wanzuwar jiki, don haka microstructure na karfe banded tsarin ba ya wanzu.Rufin bututu daga gasa bayan daidaita yanayin zafin jiki, ƙimar sanyaya ƙasa da tsarin band ɗin karfe don kawar da ƙimar sanyaya jinkirin sanyaya, lokacin da zafin jiki ya ragu zuwa Ac3, na farko ya ƙare carbon karfe austenitic ferritic hazo yankin gaba (The carbon). - matalauta yankin na iyaye lokaci game da band tsarin), tare da rage jinkirin sanyaya da kuma yawan zafin jiki eutectoid ferrite girma ne a hankali ƙara har zuwa sanyi zuwa Ac1 a lokacin da austenite cikin pearlite, a dakin da zafin jiki The microstructure na karfe, ya bayyana ferrite da pearlite makada. ƙungiya guda ɗaya.