Njira yolumikizira zachikhalidwe ndi zovuta zake zomwe zilipo kale

Kukonda kwachikhalidwe chithandizo chothandizira yagawidwa magawo awiri otsatirawa.

(1) Pakukonzekera spheroidization, chitsulo kuti spheroidized ndi annealed ndi usavutike mtima mpaka 30-50 ° C pamwamba pa mfundo yovuta ndipo unachitikira 1 mpaka 2 maola austenitization, kuti carbides ali kusungunuka mu austenite. Kenako imakhazikika pansi pamunsi pa mfundo yovuta ya Ac kuti ipeze mbewu zabwino za kristalo ndikuwongola ma carbides kuti athandizire kupopera mphamvu. Kuyenga mbewu ndi kuyeretsa ma carbides kumapangitsa kuti zinthu ziziyenda bwino, chifukwa chake gawo ili limatchedwa gawo lokonzekera spheroidization. Nthawi zambiri, gawo lokonzekera spheroidization limayambira pakutentha chitsulo mpaka 850 ~ 900 ° C ndikuchisunga 1 ~ 2h, zomwe zimatenga pafupifupi maola khumi kwathunthu.

(2) Pakadutsa spheroidizing, chitsulo chimalimbikitsidwa ndikukhazikika mpaka 700 ~ 750 ° C ndikusungidwa kwa maola pafupifupi 10, kuti ma carbide oyengeka apange ma carbides ozungulira mwa kulumikizana ndi kufalikira, kumaliza ntchito yolimbitsa thupi ndikuwonjezera.

Kuchokera pamwambapa wa spheroidization, titha kudziwa kuti chitsulo cha eutectoid ndi chitsulo cha hypereutectoid chokhala ndi mpweya wambiri, womwe umakhala ndi kutentha kwanthawi yayitali, choyambirira chimayambitsa makutidwe ndi okosijeni ndikuwotcha kwazitsulo, komwe kumachepetsa mawonekedwe apamwamba a chitsulo; Nthawi spheroidization kutentha kuteteza kumawonjezera mowa mphamvu ndipo amachepetsa kupanga dzuwa. Chifukwa chake, akuyembekeza kuti njira yolumikizira mwachangu imatha kuwerengedwa kuti ichepetse kuzungulira kwazowonjezera ndikupangitsanso chitsulo.