氧化-氢化引起的锆合金焊接件开裂问题  

Cracking Induced by Oxidation-Hydriding in Welding Joints of Zircaloy-4 Plates

作　　者：周邦新[1] 姚美意[1] 苗志[2] 李强[1] 刘文庆[1] 

机构地区：[1]上海大学材料研究所,200072 [2]中国核动力研究设计院,610041

出　　处：《核动力工程》2006年第1期34-36,共3页Nuclear Power Engineering

基　　金：国家自然科学基金资助项目(50371052)

摘　　要：3块Zr-4板经过800℃真空热轧扩散焊接的样品,在400℃过热蒸汽中腐蚀150天后会发生重新开裂,用光学显微镜观察样品截面上显微组织的变化;用微区成分分析方法研究了焊接面处与基体成分之间的差别。结果表明:焊接面上C元素的污染引起焊接面耐腐蚀性能的变坏,以及氧化-氢化联合作用导致了焊接面的开裂。The welding joints of three plates of Zircaloy-4 obtained by hot rolling diffusion welding at 800℃ in vacuum were cracked during autoclave tests at 400℃ superheated steam after exposure longer than 150 days. The section of specimens was examined by optical microscopy and the composition of micro-area at the welding seams and the matrix was analyzed and compared. The result shows that the contamination of carbon at the welding surface and the combination of oxidation and hydriding induced cracking is responsible for the cracking of welding seams during autoclave testing.

关 键 词：ZR-4 腐蚀 氢化锆 开裂 

分 类 号：TG14[一般工业技术—材料科学与工程]