氢化物对锆合金薄板焊缝断裂行为的影响

锆合金被广泛应用于反应堆的燃料管包壳材料，当服役过程中锆合金的力学性能改变时，对其力学性能完整性的评估至关重要。基于小尺寸三点弯曲试样，建立锆合金薄板焊缝的断裂韧度测试方法，完成腐蚀渗氢后锆合金焊缝在室温和360℃下准静态断裂韧度试验，分析氢腐蚀和温度对锆合金焊缝断裂性能的影响。研究结果表明，氢腐蚀和温度均能对锆合金焊缝断裂性能产生显著影响，由于高温条件下聚集在裂尖附近的氢化物溶解，使得360℃下锆合金渗氢焊缝断裂韧度较室温下的断裂韧度有显著提升。

Effect of Hydride on Fracture Behavior of Zirconium Alloy Platy Welds

Zirconium alloys are widely used in reactor fuel tube cladding, it is very important to evaluate the mechanical integrity of zirconium alloys when their mechanical properties change in service. Fracture toughness test method of small zirconium alloy platy welds was established based on small size three-point bending sample. The quasi-static fracture toughness tests of hydrogenated zirconium alloy welds at room temperature and 360℃ were carried out. The influence of hydrogen corrosion and temperature on fracture performance of zirconium alloy welds was analyzed. The results show that hydrogen corrosion and temperature can significantly affect the fracture properties of zirconium alloy welds. The fracture toughness of hydrogenated zirconium alloy welds at 360℃ enhances evidently compared with that at room temperature because of the dissolution of the hydrides distributed around crack tip.