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对３１６Ｌ和３１６ＬＮ奥氏体不锈钢进行了单轴拉压及两种典型应变路径下的多轴非比例加载低周疲劳试验，并对上述两种材料的单轴及多轴非比例加载低周疲劳位错结构进行了观察，重点分析了合金元素氮对不锈钢的单轴及多轴非比例加载低周疲劳特性及其微结构的影响。深入研究了非比例循环循环附加强化及低周疲劳寿命对合金元素氮依赖性的微观机理。
The uniaxial tension of 316L and 316LN austenitic stainless steel and uniaxial low-cycle fatigue test under two typical strain paths were carried out. The uniaxial and multi-axial non-proportional loading low cycle fatigue The dislocation structure was observed. The effect of alloying elemental nitrogen on the low-cycle fatigue characteristics and microstructure of uniaxial and multi-axial non-proportional loading of stainless steel was analyzed. The microscopic mechanism of the nitrogen dependence of alloying elements on the strengthening of non-proportional circulation and the service life of low-cycle fatigue was deeply studied.