HSLA-TRIP钢动态拉伸性能和残余奥氏体转变  

Dynamic Tensile Properties and Retained Austenite Transformation in HSLA-TRIP Steel

作　　者：孙鹏[1] 李麟[1] 符仁钰[1] 韦习成[1] 

机构地区：[1]上海大学材料学院,上海200072

出　　处：《钢铁》2004年第10期63-67,共5页Iron and Steel

基　　金：国家自然科学基金资助项目 ( 5 0 1710 3 8) ;上海市科委自然科学基金 ( 0 3 ZR14 0 3 5 );上海市教委发展基金 ( 0 3 K0 2 7)资助

摘　　要：对成分为 0 .11C- 0 .6 2 Si- 1.6 5 Mn的低硅 TRIP钢不同试验温度下的动态拉伸性能和残余奥氏体的转变行为进行了研究。试验结果表明 ,两相区热处理温度接近 Ac1 可以获得较多的铁素体和残余奥氏体 ,此类试样拉伸试验结果有较高的强塑性配合。 110℃下的抗拉强度较 2 0℃下的降低约 30 0 MPa;均匀伸长率在应变速率 10 0 0s- 1左右达到峰值 ,总伸长率随应变速率提高而单调增加。试验温度为 5 0℃和 75℃下的能量吸收值可达到 2 6 0 0 0MPa· %。试验温度越高 ,残余奥氏体稳定性越好 ,动态拉伸的绝热效应也抑制了残余奥氏体的形变诱发相变。To evaluate the influence of temperature and strain rate on the mechanical properties of low Si TRIP steel, the steel with the composition of 0.11C-0.62Si-1.65Mn has been tested on dynamic tensile machine. The result indicates that when the annealing temperature is near to Ac 1, more ferrite and retained austenite can be obtained. In the case, a good combination between strength and plasticity is also obtained. Elevating the testing temperature decreases the tensile strength, and at 110 ℃ the strength descends by 300 MPa. The uniform elongation reaches the maximum value when the strain rate approach 1000 s -1 and the total elongation increases with the strain rate increasing at experimental temperature 50 and 75 ℃. The energy absorption value reaches 26000 MPa·% equal to 1.5 times at 110 ℃. With the temperature rising, the stability of retained austenite gets higher and strain rate also can restrain the transformation of retained austenite.

关 键 词：低硅 TRIP钢 力学性能 残余奥氏体 

分 类 号：TG115.5[金属学及工艺—物理冶金]