氧化-氢化引起的锆合金焊接件开裂问题

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基金项目:

国家自然科学基金资助项目(50371052)

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

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。
- Zr-4 /
- 腐蚀 /
- 氢化锆 /
- 开裂
Abstract: 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 mi-cro-area at the welding seams and the matrix was analyzed and compared.The result shows that the con-tamination 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.
- Zircaloy-4 /
- Corrosion /
- Zirconium hydride /
- Cracking