1Cr18Ni9Ti对接管接头表面缺陷分析  

Analysison The Surface Defects of 1Cr18Ni9Ti Butt-Joint Pipe

作　　者：李阿妮[1] 谷胜民[1] 王影[2] 李丽[1] 刘涛[1] 

机构地区：[1]中国运载火箭技术研究院,北京100076 [2]航天材料及工艺研究所,北京100076

出　　处：《宇航材料工艺》2014年第2期71-74,共4页Aerospace Materials & Technology

摘　　要：对接管接头采用1Cr18Ni9Ti棒材生产,经过机械加工后与相同牌号管材焊接,焊接后酸洗发现零件表面存在缺陷。通过对失效件缺陷形貌观察、化学成分分析、金相分析及显微硬度测试,并结合酸洗试验。结果表明:对接管接头材料内部存在沿变形流线的贫铬区,导致该区域的耐蚀性差,在机加工的过程中贫铬区暴露在表面或近表面,在酸洗过程中该区域被优先腐蚀,形成了蚀孔类宏观缺陷,此贫铬现象为原材料缺陷。The butt-joint pipe was made of bars of 1Crl8Ni9Ti, weld with the same type pipe after machining, then acid washing defects were found in the parts of suface. Through observation and analysis of suface morphology, composition, metallo^Taphy, microhardness and acid test, we can conclude that chromium depletion areas along the de formation line was exist that cause the corrosion preventive becoming worse. In the machining process, the chromium depletion areas expose to the surface or near the surface, corrosion first happened in the areas with the process of acid washing, then macroscopic defects of pitting are formed. The chromium depletion phenomenon is the defects of raw ma- terial.

关 键 词：对接管接头 酸洗 贫铬 

分 类 号：TG141[一般工业技术—材料科学与工程]