对低硅HSLA-TRIP钢在室温条件下500s-1～1700S-1应变率范围内的动态拉伸性能进行了研究.实验结果表明,随应变率增大,钢的均匀延伸率(eu)下降、总延伸率(et)和能量吸收值增加,但强度(σb)保持不变或略有提高,能量吸收的增幅随应变率增大而变缓.分析认为:残余奥氏体在颈缩发生前的较完全转变有利于提高均匀延伸率;高应变率下能量吸收值的提高可能由两个原因造成:一是大应变下的奥氏体相变推迟断裂的发生;二是动态拉伸中的绝热温升有利于总延伸率的提高.
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