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用FormasterF全自动膨胀仪和THERMECMASTORZ热模拟试验装置测定了86CrMoV7钢未变形奥氏体、一次变形奥氏体和二次变形奥氏体的CCT曲线。结果表明:试验用钢只发生珠光体转变和马氏体转变;热变形明显地促进珠光体、马氏体转变;不发生珠光体转变的临界冷却速度由0.76℃s(未变形)提高到3.1℃s(一次变形)和1.5℃s(二次变形);Ms点由143℃(未变形)提高到150℃(一次变形)和170℃(二次变形);热变形细化珠光体组织并使珠光体组织退化;变形奥氏体中的未溶碳化物可以促进珠光体组织形核,加速珠光体转变。
The CCT curves of undeformed austenite, primary austenite and secondary deformed austenite of 86CrMoV7 steel were measured with FormasterF automatic dilatometer and THERMECMASTORZ thermal simulation device. The results show that only pearlite transformation and martensite transformation occur in the test steel. Thermal deformation obviously promotes the transformation of pearlite and martensite. The critical cooling rate without pearlite transformation increases from 0.76 ℃ s (undeformed) to 3.1 ℃ s (primary deformation) and 1.5 ℃ s (secondary deformation); Ms point increased from 143 ℃ (undeformed) to 150 ℃ (primary deformation) and 170 ℃ (secondary deformation); thermal deformation refined pearlite and So pearlite degeneration; undissolved carbides in austenite can promote the pearlite nucleation and accelerate pearlite transformation.