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 maganin zafi da sauran dalilai.Lokacin da sanyaya, da sauri, mafi girma da carbon abun ciki da gami abun da ke ciki, m sanyi tsarin nakasawa filastik karkashin thermal danniya samar da mafi girma, da karshe nau'i na saura danniya da ya samu.

A gefe guda kuma ƙarfe a lokacin zafi mai zafi saboda canji a cikin nama watau austenite zuwa martensite, tare da haɓaka ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun kayan aiki, 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 sama, damuwa na juzu'i na zuciya, da damuwa na thermal 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.