Zr-3锆合金板表面白斑缺陷产生原因

Reason for White Spot Defect on Surface of Zr-3 Zirconium Alloy Sheet

在生产过程中采用树脂砂轮打磨+酸洗工艺对Zr-3合金板坯进行表面处理后,发现其表面出现白斑。采用化学成分分析、显微组织观察和残余应力测试方法对白斑产生原因进行了分析。结果表明:白斑是由于过高的残余应力产生的;通过改用千叶轮打磨或喷砂工艺,降低表面残余应力,减少孪晶形成后,白斑缺陷消除。

After surface treatment by resin wheel grinding and pickling in production,white spot appeared on surface of Zr-3 alloy slabs.The cause of the white spot was analyzed by chemical composition analysis,microstructure observation and residual stress test.The results show that the white spot was caused by excessive residual stresses.The white spot defect was eliminated by application of thousand impeller grinding or sand blasting to decrease surface residual stresses and reduce twin crystal formation.