利用冲击实验、拉伸实验、XRD和TEM对2种不同N含量的无Ni高N奥氏体不锈钢低温变形行为进行了研究.结果表明,高N奥氏体不锈钢在低温下发生明显的韧脆转变和加工硬化现象.在实验材料的Mn含量水平内,提高Mn含量能够改善高N奥氏体不锈钢的低温塑性和韧性,降低其韧脆转变温度.18Cr-12Mn-0.55N钢在低温拉伸变形时会发生形变诱导马氏体相变,但马氏体转变量很少,降低温度对马氏体转变量无明显影响.形变诱导马氏体能提高高N奥氏体不锈钢的加工硬化能力,但降低了钢的低温塑性和韧性.加工硬化能力和层错能随温度的降低而降低是Fe-Cr-Mn高N奥氏体不锈钢在低温下发生脆断的主要原因.
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