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用热处理方法强化的复杂零件,一般在热处理时会产生变形,引起变形的原因是热应力和组织应力.目前,等温淬火、分段淬火、在模内和心轴上淬火、在压板下淬火等方法获得了推广,这些方法虽然能减小变形,但并不能消除变形.利用合金在相变时产生的软化的一些无变形热处理方法,为消除热处理过程中的翘曲开辟了很大的可能性. 由于零件机械性能要求高(R_c58～62及50～56)
Complex parts that are hardened by heat treatment generally deform during heat treatment, causing deformation due to thermal stress and stress of the structure. Currently, austempering, segmented quenching, quenching in mold and mandrel, quenching under platen Although these methods can reduce the deformation, they can not eliminate the deformation. The use of some non-deforming heat treatment methods to soften the alloy during the phase transition has opened up a great possibility to eliminate the warpage in the heat treatment Due to the high mechanical requirements (R_c58 ~ 62 and 50 ~ 56)