在应变速率为2×10-5～1×10-3s-1范围内以及不同温度(600～700 ℃)下, 对11Cr铁素体/马氏体钢进行拉伸试验, 研究其在变形过程中的锯齿流变现象。结果表明: 试验钢在变形过程中出现了“反常”锯齿流变, 且只出现一种E型锯齿波; 锯齿开始出现在拉伸应力最大值附近, 锯齿波主要处于拉伸曲线的下降段; 锯齿形成的有效激活能约为43.44 kJ·mol-1; 高温时, 置换原子气团能量高, 完全钉扎住位错, 当一定数量的位错达到临界运动速度时, 摆脱了置换原子气团的钉扎, 从而导致产生锯齿流变现象。
所属栏目
新材料 新工艺国家自然科学基金重点资助项目(51034011)
收稿日期
2013/3/62014/3/3
作者单位
季波:上海交通大学机械与动力工程学院, 上海 200240
沈寅忠:上海交通大学机械与动力工程学院, 上海 200240
黄希:上海交通大学机械与动力工程学院, 上海 200240
备注
季波(1986-), 男, 江苏淮安人, 硕士研究生。
引用该论文:
JI Bo,SHEN Yin-zhong,HUANG Xi.Serrated Flow of 11 Cr Ferritic/Martensitic Steel during High Temperature Tension[J].Materials for mechancial engineering,2014,38(5):33～36
季波,沈寅忠,黄希.11Cr铁素体/马氏体钢高温拉伸时的锯齿流变现象[J].机械工程材料,2014,38(5):33～36
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