C-Mn钢过冷奥氏体形变过程中的真应力—真应变曲线分析  

Analysis of True Stress-True Strain Curves of Undercooled Austenite during Deformation in Low C-Mn Steels

作　　者：周荣锋[1] 杨王玥[2] 周荣[1] 孙祖庆[3] 张艳[3] 

机构地区：[1]昆明理工大学机电工程学院,云南昆明650093 [2]北京科技大学材料科学与工程学院,北京100083 [3]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《材料热处理学报》2004年第6期60-64,共5页Transactions of Materials and Heat Treatment

基　　金：国家重点基础研究发展规划 (No .G1 9980 61 50 6) ;国家高技术研究计划 (No .2 0 0 1AA332 0 2 0 )

摘　　要：分析了不同碳、锰含量的低碳 (锰 )钢过冷奥氏体在 76 0℃ ,1s- 1 时的单向压缩变形过程中真应力—真应变曲线的特征。结果表明 ,真应力—应变曲线呈双峰特征 ,第一个峰是孕育期内变形奥氏体的加工硬化和形变强化相变两个物理过程的结果 ,第二个峰是铁素体动态回复和 (或 )再结晶的结果。碳、锰含量提高时相变速度减缓 ,铁素体动态再结晶能力减弱 ,分别使得第一峰过后应力软化率减小 ,第二个峰变得宽阔平坦。The characteristics of true stress-true strain curves of undercooled austenite during deformation at 760°C and 1 s-1 in low carbon (Mn) steels with different carbon and manganese content were analyzed. The results show that the stress-strain curves demonstrate two peaks. The first one is resulting from two physical processes of work hardening of undercooled austenite during transformation incubation period and deformation-enhanced transformation (DEFT), and the second is the result of ferrite dynamic recovering and dynamic recrystallization. The decreasing rate of the flow stress after the first peak decreases and the second peak is much flatter and wider with increase of carbon or manganese content because the addition of carbon or manganese is unfavourable to DEFT and ferrite dynamic recrystallization.

关 键 词：低碳(锰)钢 过冷奥氏体形变 真应力-应变曲线 碳、锰含量 

分 类 号：TG111.2[金属学及工艺—物理冶金] TG142.31[金属学及工艺—金属学]