对热轧态和动态应变时效预变形态的316L奥氏体不锈钢进行了550 ℃下不同加载水平的疲劳蠕变实验. 与热轧态相比, 在应力控制的疲劳蠕变循环过程中, 动态应变时效表现为位移的突然阶跃现象; 动态应变时效预变形处理能有效地减小材料的循环应变幅度, 提高材料的强度, 推迟材料中出现位移阶跃现象的循环周次, 延长材料的疲劳蠕变寿命.
The fatigue--creep behaviors of hot rolled and dynamic strain aging pre--treated 316L austenitic stainless steels were investigated under different loading conditions at 550 ℃. Under stress control mode, the macroscopic manifestation of dynamic strain aging is the abrupt displacement jumps during cyclic deformation. By comparing with the hot rolled treatment the dynamic strain aging pre--treatment makes the cyclic strain amplitude decrease and the cycle number at the first abrupt displacement jump postpone, i.e., the material strength is enhanced and fatigue--creep life is effectively prolonged.
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