316不锈钢管道和压力容器在制造、焊接和装配等过程中不可避免的会产生塑性变形导致的塑性硬化，塑性硬化不仅影响材料的力学性能，而且影响材料服役过程中应力腐蚀裂纹尖端应力应变场及裂纹扩展驱动力变化规律，为了研究316不锈钢塑性硬化对应力腐蚀规律的影响，采用实验、理论和有限元相结合的方法分析了塑性硬化对316不锈钢应力腐蚀裂纹扩展驱动力的影响，主要研究内容如下：

(1) 利用实验获得316不锈钢的应力应变曲线，并分析不同塑性硬化程度的316不锈钢的屈服强度和硬化指数的分布规律；研究316不锈钢的塑性硬化和维氏硬度的变化规律，在分析材料力学性能的基础上，建立材料屈服强度和维氏硬度的关系；利用扫面电镜观察不同预拉伸量316不锈钢的断口形貌，对断口进行对比分析。

(2) 建立有限元模型，在实验数据的基础上，分析316不锈钢的不同力学参量和材料的塑性硬化对裂纹尖端应力应变场的影响规律，分析材料屈服强度和硬化指数对应力腐蚀裂纹尖端Mises应力场、拉伸应力场、等效塑性应变场和拉伸应变场的影响，进一步研究了材料塑性硬化对应力腐蚀裂纹尖端力学场的影响规律。

(3) 研究应力腐蚀裂纹扩展驱动力的力学参量，分析316不锈钢的屈服强度和硬化指数对应力腐蚀裂纹尖端应力三轴度、裂纹尖端应变率、裂纹尖端的蠕变率的影响及裂尖应力三轴度、应变率和蠕变率对材料力学参量的敏感性；研究了316不锈钢塑性硬化对裂纹尖端应力三轴度、应变率和蠕变率的影响；并比较分析出合理的裂纹扩展驱动力力学参量。

(4) 结合实验研究管道焊接接头热影响区的塑性硬化规律，并分析了热影响区的塑性硬化对融合线上应力腐蚀裂纹尖端应力应变场的影响，研究了对热影响区的塑性硬化对融合线上应力腐蚀裂纹尖端裂纹扩展驱动力的影响。

316 stainless steel pipes and pressure vessels will inevitably produce plastic hardening caused by plastic deformation during the manufacturing, welding and assembly processes. Plastic hardening not only affects the mechanical properties of the material, but also affects the stress-strain field at the tip of the stress corrosion crack and the law of the driving force of crack propagation during the service process of the material. In order to study the effect of plastic hardening of 316 stainless steel on the stress corrosion law, the influence of plastic hardening on the driving force of stress corrosion crack growth of 316 stainless steel was analyzed by a combination of experiment, theory and finite element method. The main research contents are as follows:

(1) Use experiments to obtain the stress-strain curve of 316 stainless steel, and analyze the distribution law of yield strength and hardening index of 316 stainless steel with different degrees of plastic hardening. Study the change law of plastic hardening and Vickers hardness of 316 stainless steel, and establish the relationship between material yield strength and Vickers hardness based on the analysis of material mechanical properties. Scanning electron microscope was used to observe the fracture morphology of 316 stainless steel with different pre-stretching amount, and the fracture was compared and analyzed.

(2) Establish a finite element model, and analyze the influence of different mechanical parameters of 316 stainless steel and the plastic hardening of the material on the stress and strain field at the crack tip based on the experimental data. Analyze the influence of material yield strength and hardening index on the stress corrosion crack tip Mises stress field, tensile stress field, equivalent plastic strain field and tensile strain field, and further study the influence of material plastic hardening on the stress corrosion crack tip mechanical field .

(3) Study the mechanical parameters of stress corrosion crack growth driving force, analyze the influence of the yield strength and hardening index of 316 stainless steel on the stress triaxiality of the stress corrosion crack tip, the strain rate of the crack tip, and the creep rate of the crack tip. The sensitivity of crack tip stress triaxiality, strain rate and creep rate to material mechanical parameters is analyzed. It also compares and analyzes the reasonable mechanical parameters of the crack propagation driving force.

(4) Combining experiments to study the law of plastic hardening in the heat-affected zone of pipe welded joints, and analyze the influence of the plastic hardening of the heat-affected zone on the stress-strain field at the tip of the stress corrosion crack on the fusion line. The effect of plastic hardening of the heat-affected zone on the driving force of stress corrosion crack tip crack propagation on the fusion line is studied.

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