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采用力学拉伸实验测定充氚不锈钢的断裂强度值,采用拉伸断口进行SEM观察和正电子湮灭(PAT)分析,采用TEM动态拉伸实验观察和记录材料在微观断裂过程中的行为,通过对比分析氚对不锈钢断裂过程的影响。结果表明,高温充氚后,室温存放2a,样品中氚衰变产生的氦累积已达约30ppm;氚、氦使样品断裂强度降低,内部缺陷增多,正电子寿命变长。TEM观察未发现明显的氦泡组织;动态拉伸实验表明,充氚促进裂纹尖端位错的发射和增殖;HR-1、HR-2不锈钢微观断裂过程相似,可表述为氚致微裂纹的形核-形成微空洞-微空洞长大-空洞连接(断裂)。氚、氦使无位错区减小甚至消失。
Tensile strength of tritium-filled stainless steel was measured by mechanical tensile test, SEM observation and positron annihilation (PAT) analysis were conducted by tensile fracture test. The dynamic tensile test of TEM was used to observe and record the behavior of the material during microscopic fracture. By comparative analysis Effect of Tritium on the Fracture Process of Stainless Steel. The results show that after high temperature trituration, the sample is stored at room temperature for 2 years, and the accumulation of helium in the sample has reached about 30 ppm. The tritium and helium decrease the breaking strength, increase the internal defects and prolong the positron lifetime. The results of dynamic tensile test showed that the tritium stimulated the emission and proliferation of dislocations at the crack tip. The microscopic fracture processes of HR-1 and HR-2 stainless steels were similar and could be described as the form of tritium-induced microcracks Core - forming micro-cavities - micro-cavities grow - hollow connection (fracture). Tritium, helium so that no dislocation area to reduce or even disappear.