Tsarin karfe workpiece a cikin dumama da sanyaya tsari, saboda rashin daidaito sanyaya kudi na surface Layer da core sashe da kuma lokaci samar da yanayin zafi bambanci, shi zai kai ga girma fadada da contraction na m danniya cewa zafi danniya. A cikin thermal danniya saboda wani zafin jiki a kasa da surface fara core sashe, da ƙanƙancewa ne kuma mafi girma fiye da barin tsakiyar core sashe na tashin hankali, a lõkacin da karshen sanyaya, tun da tsakiyar rabo daga karshe sanyaya girma contraction ba zai iya. da yardar kaina barin tsakiyar rabo daga saman matsa lamba tashin hankali. Wannan shi ne a ƙarƙashin rinjayar thermal danniya kyakkyawan da workpiece surface matsa lamba da zuciya ma'aikatar tashin hankali. Wannan sabon abu yana sanyaya sauri, abun da ke tattare da kayan abu da magani mai zafi da sauran dalilai. Lokacin da sanyaya, da sauri, mafi girma da carbon abun ciki da gami abun da ke ciki, m sanyaya tsari na roba nakasawa karkashin thermal danniya samar da mafi girma, da karshe nau'i na saura danniya da ya samu.

A gefe guda kuma ƙarfe a lokacin maganin zafi saboda canjin nama watau austenite zuwa martensite, tare da haɓaka ƙayyadaddun ƙayyadaddun ƙayyadaddun girma na aikin aikin, sassa daban-daban na aikin aikin yana da canjin lokaci, wanda ya haifar da rashin daidaituwa. na ƙarar nama girma danniya. Sakamakon ƙarshe shine damuwa na nama na nama na damuwa, ɓangaren zuciya na damuwa, da damuwa na zafi a daidai akasin haka. A danniya a cikin workpiece size da sanyaya kudi na martensite canji zone factor, siffar, sinadaran abun da ke ciki na abu.