利用慢应变速率拉伸(SSRT)的方法研究了奥氏体不锈钢AL-6XN,316Ti和TP-347在550/650℃,25 MPa的超临界水环境中的应力腐蚀开裂敏感性.结果表明,随着温度由550℃升高到650℃,其屈服强度和抗拉强度均发生了明显的下降,而三者的延伸率却呈现出了3种不同的变化规律.由试样的断口和侧面形貌可知,AL-6XN在550/650℃,316Ti在550℃工况下具有应力腐蚀开裂倾向,且其应力腐蚀开裂倾向大小关系为:AL-6XN/550℃＞316Ti/550℃＞AL-6XN/650℃.
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