Fe－5Ni合金奥氏体高温变形行为  

Hot Deformation of Austenite in Fe-5Ni Alloy

作　　者：徐洲[1] 酒井拓 

机构地区：[1]上海交通大学 [2]电气通信大学

出　　处：《热加工工艺》1996年第6期8-10,共3页Hot Working Technology

摘　　要：在温度９７３～１３７３Ｋ、形变速率２×１０－５～１．５×１０－１ｓ－１的试验条件下，研究了Ｆｅ－５Ｎ合金奥氏体的高温拉伸变形行为．结果表明：高温变形时峰值应力σｐ与温度Ｔ和形变速ε之间符合下式关系：Ｚ＝εｅｘｐ（Ｑ／ＲＴ）＝Ａ（ｓｉｎｈ（ａσｐ））ｍ。高应变速率区的表观激活能Ｑ为３１４ｋＪ／ｍｏｌ，与Ｆｅ的自扩散激活能Ｑｓｄ相当，变形由空位扩散所控制；而低应变速率区的Ｑ为２０２ｋＪ／ｍｏｌ，约为Ｑｓｄ的２／３，变形由晶界滑移所控制．Hot deformation of Fe-5Ni alloy was studied by means of tensile tests. The test temperatures were in the austenitic range from 973 to 1373K over a wide range of strain rate between 2 × 10-5 to 1. 5×10-1s-1. The peak flow stress (σp) can be correlated with temperature (T) and strain rate (ε) by the following equation, Z=εexp (Q/RT) = A(sinh (aσp)m. The activation energy for deformatin(Q) in the higher strain rate range was nearly the same as that for self-diffusion(Qsd), but the Q in the lower strain rate range was less than the Qsd.

关 键 词：高温 变形 铁镍合金 奥氏体 热处理 

分 类 号：TG166.93[金属学及工艺—热处理]