相变能及相变诱发塑性增量的测试  

Measurement of Transformation Energy and Increment of Transformation-induced Plasticity

作　　者：张旺峰[1] 朱金华[2] 曹春晓[1] 

机构地区：[1]北京航空材料研究院,北京100095 [2]西安交通大学金属材料强度国家重点实验室,陕西西安710049

出　　处：《机械工程材料》2008年第6期4-5,43,共3页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(59771048、59831030);国家重点基础研究专项经费资助项目(G19990650)

摘　　要：利用亚稳态材料的拉伸曲线,通过产生应变诱发马氏体相变前的奥氏体硬化曲线段外推,提出了相变能及相变诱发塑性增量的测试方法;并以铬镍系奥氏体不锈钢为例进行了测试。结果表明:奥氏体不锈钢在-196℃时,随应变量的增加单位体积分数(1%)马氏体的相变能基本保持恒定,其值为11.3×106J.m-3;单位体积分数(1%)马氏体相变诱发的塑性增量为0.205%。Using the tensile curve of metastable materials,a method for measuring transformation energy(Ept) of strain-induced martensite and increment of transformation-induced plasticity was proposed by extrapolating hardening curve of austenite.Ept and the averaging plasticity increment(P value) was tested at-196 ℃ using a CrNi series austenite stainless steel as an example.The results show that per unit volume fraction Ept keeps a constant value of 11.3×106 J·m-3 in the stages of elasto-plasitic instability and st...

关 键 词：应变诱发马氏体相变 相变能 相变诱发塑性 

分 类 号：TG142.15[一般工业技术—材料科学与工程]