热变形对86CrMoV7钢过冷奥氏体连续冷却转变的影响  

Effect of Hot Deformation on Continuous Cooling Transformation for Super Cooling Austenite of 86CrMoV7 Steel

作　　者：乔桂英[1] 肖福仁[1] 胡怡[1] 张乐欣[1] 廖波[1] 

机构地区：[1]燕山大学材料化工学院,河北秦皇岛066004

出　　处：《钢铁研究学报》2000年第1期42-46,共5页Journal of Iron and Steel Research

摘　　要：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 austenite uncompressed and compressed at different conditions for 86CrMoV7 steel have been measured by Formaster F automatic expansion instrument and THERMECMASTOR Z hot imitated equipment. The results show that the pearlite and martensite transformation occur at different cooling rates; the hot deformations promote pearlite and martensite transformation. The critical cooling rate without pearlite transformation increases from 0.76 ℃/s for solution status to 3.1 ℃/s for one step compression or 1.5 ℃/s for two step compression. While the M s value increases from 143 ℃ to 150 ℃ or 170 ℃. The remaining carbide in deformed austenite can promote the nucleation of pearlite, and accelerate pearlite transformation.

关 键 词：热变形 CCT曲线 珠光体转变 马氏体转变 钢 

分 类 号：TG142.1[一般工业技术—材料科学与工程]