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OALib Journal期刊
ISSN: 2333-9721
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18.8\%mntrip/twip钢的拉伸应变硬化行为
Keywords: 金属材料,高锰钢,trip/twip效应,应变硬化,力学性能
Abstract:
？对锰含量为18.8%的trip/twip钢进行单轴拉伸实验,研究了这种钢的应变硬化行为.结果表明:这种高锰trip/twip钢的真应力应变曲线不完全遵循hollomon的线性关系,在不同变形阶段强化机制不同.在塑性变形的开始阶段trip效应比较明显,且应变硬化指数n是恒定的;而真应变在0.14--0.35之间时二阶导数d2σ/dε2>0,应变硬化指数n随着应变量的增加而增加,其微观机制是形成大量的形变孪晶,并有孪晶和位错的交互作用,twip效应在该阶段占主导作用.真应变大于0.35后有少量trip效应,此时两相均发生变形.
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