Umbutho wentsimbi ephantsi kwekhabhoni kwindawo yokushisa i-deformation ye-ferrite kunye ne-pearlite, ukuba kukho isakhiwo sebhendi ye-ferrite kunye ne-pearlite etshintshanayo imivumbo.Isakhiwo sebhendi yentsimbi yekhabhoni esezantsi engenamthungo, ukusuka kubushushu begumbi ukuya kubushushu obuqhelekileyo, xa ubushushu be-Ac1, uguquko lwe-eutectoid lwenzeka, inguqu yepearlite ye-austenite.Kule meko, amacandelo azikho i-austenite ene-homogeneous, kunye nobushushu bokufudumeza budlula i-Ac3, isisombululo se-ferrite esiqinileyo sigqityiwe, ngoko isakhiwo sentsimbi siguqulelwa kwisigaba esisodwa se-austenite, njengoko ubushushu buqhubeka bukhula kunye nokufudumala kweqondo lokushisa, austenite iyunifomu ngokupheleleyo.

Ukukhululwa kokupholisa ubushushu obuqhelekileyo Emva kokufukanyelwa, xa izinga lokupholisa lentsimbi ukuphelisa isakhiwo esikhulu esinebhanti kunye nesantya esibalulekileyo sokupholisa (oko kukuthi, ukucinezelwa kwe-ferrite precipitate ukusuka kwinqanaba lokupholisa le-austenite), umbhobho wensimbi we-eutectoid ferrite umzimba ucinezelwe, ukuze i-ferrite ayigqithisi kwaye isusa i-solvent ihlala kwi-austenite, kwaye njengoko iqondo lobushushu liyancipha ngokwandisa iqondo le-supercooling, kwaye ayiyi kuphinda yenzeke i-pro-eutectoid ferrite, ngemveliso yokubola ngokuthe ngqo kwe-austenite kwi-eutectoid ferrite + cementite, kodwa ngokungafaniyo ne-eutectoid ukwakheka kwentsimbi, ebizwa ngokuba yi "pseudo-eutectoid" kuba "pseudo-eutectoid" akukho ferrite eutectoid ubukho bomzimba, ngoko ke i-microstructure yesakhiwo esinebhanti yentsimbi ayikho.Ukugqunyelelwa kombhobho ukusuka kubhaka emva kobushushu obuqhelekileyo, isantya sokupholisa singaphantsi kwesakhiwo sebhendi yentsimbi ukuphelisa inqanaba lokupholisa elibalulekileyo lokupholisa okucothayo, xa iqondo lobushushu lincitshiswa laya kutsho kwi-Ac3, indawo yokuqala ephele icarbon steel austenitic ferritic precipitation zone ngaphambili. -ummandla ohlwempuzekileyo wesigaba somzali malunga nesakhiwo sebhendi), kunye nokunciphisa ukupholisa okucothayo kunye nobushushu bevolumu ye-eutectoid ferrite yanda ngokuthe ngcembe de kubanda ukuya kwi-Ac1 xa i-austenite ibe yi-pearlite, kwiqondo lobushushu begumbi I-microstructure yentsimbi, yabonakala i-ferrite kunye ne-pearlite bands ihlanganiswe umbutho omnye.