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OALib Journal期刊
ISSN: 2333-9721
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冷变形对高氮奥氏体不锈钢组织与力学行为的影响
, PP. 713-718
Keywords: 高氮钢,冷变形,组织,力学性能,层错能
Abstract:
本文通过对氮含量为1.2%的高氮奥氏体不锈钢施加不同变形量的压缩变形，研究了冷变形对钢组织和力学行为的影响。研究结果表明，实验钢在最高变形量达到56%的冷变形过程中未发现有α’马氏体形成。变形初期时钢中孪晶和滑移共同参与变形，孪晶对滑移有强烈的阻碍作用。随变形量的增加，孪晶受到滑移线的切割，孪晶界逐渐模糊。高氮钢的加工硬化指数随变形量增加而降低。当冷变形至56%时，钢的屈服强度提高了2倍左右，抗拉强度提高了1倍左右，分别达到1645MPa和1870MPa。通过对比分析氮在几种奥氏体不锈钢中的作用，认为氮通过短程有序而非降低层错能的方式促进位错的平面滑移，提高钢的加工硬化能力。
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