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.

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