锻压技术

临界水温下加工硬化对核级316L不锈钢应力腐蚀裂纹扩展驱动力的影响

英文标题：Influence of work hardening at critical water temperature on driving force of stress corrosion crack growth for nuclear grade 316L stainless steel

作者：樊亚玲1 杨宏亮2

单位：1. 西安铁路职业技术学院机电工程学院 2. 西安科技大学工程训练中心

关键词：应力腐蚀裂纹加工硬化裂纹扩展驱动力 316L不锈钢力学特性

分类号：TG174.3

出版年,卷(期):页码：2021,46(12):210-215

摘要：

为了解核电临界水温下核级316L不锈钢加工硬化对应力腐蚀裂纹扩展驱动力的影响，利用实验获得316L不锈钢在500 ℃ 环境中的力学性能，在此基础上，借助有限元数值模拟手段，分析了应力腐蚀裂纹尖端应力场的分布规律，研究了加工硬化对裂纹扩展驱动力的影响。结果表明：拉伸变形越大，316L不锈钢的屈服强度和硬化指数越高，材料的加工硬化程度也越高；316L不锈钢的屈服强度越大，裂尖应力和裂尖应变速率越大，裂纹扩展驱动力越大；硬化指数越大，裂尖应力和裂尖应变速率越小，裂纹扩展驱动力也越小；裂尖应力和裂尖应变速率均可以反应裂纹扩展驱动力的变化规律，但裂尖应变速率更适合裂纹扩展速率的定量计算。

To understand the influence of work hardening for nuclear grade 316L stainless steel on the driving force of stress corrosion crack growth at nuclear power critical water temperature, the mechanical properties of 316L stainless steel in an environment at 500 ℃ were obtained by experiments. On this basis, with the aid of finite element numerical simulation method, the distribution laws of stress field at the tip of stress corrosion crack were analyzed, and the influence of work hardening on the driving force of crack growth was studied. The results show that the greater the tensile deformation is, the higher the yield strength, hardening index and degree of material work hardening degree for 316L stainless steel are. The greater the yield strength of 316L stainless steel is, the greater the crack tip stress and crack tip strain rate are and the greater the driving force of crack growth is. The larger the hardening index is, the smaller the crack tip stress, crack tip strain rate are, and the smaller the driving force of crack growth is. Both the crack tip stress and crack tip strain rate can reflect the changing laws of the driving force of crack growth, but the crack tip strain rate is more suitable for the quantitative calculation of crack growth rate.

基金项目：

国家自然科学基金面上项目（52075434）；西安科技大学博士启动金（8150120009）

作者简介：樊亚玲（1981-），女，硕士，讲师 E-mail：yaling_fan@163.com 通信作者：杨宏亮（1981-），男，博士，工程师 E-mail：hl_yang@163.com

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