05Cr17Ni4Cu4Nb钢焊接接头的疲劳性能  

Fatigue Property Study of 05Cr17Ni4Cu4Nb Steel Weld Joints

作　　者：刘福广[1] 李振伟[2] 冯琳杰[2] 李太江[1] 王琦[2] 王彩侠[1] 李巍[1] 

机构地区：[1]西安热工研究院有限公司,西安710032 [2]华能平凉电厂,甘肃平凉744000

出　　处：《焊管》2013年第11期23-26,共4页Welded Pipe and Tube

摘　　要：采用四点弯曲疲劳试验方法,研究了05Cr17Ni4Cu4Nb汽轮机低压末级动叶片用钢焊接接头的疲劳性能,绘制了该钢焊接接头的S-N曲线,并与05Cr17Ni4Cu4Nb钢母材进行了对比。研究结果表明,采用优化的焊接、热处理工艺,05Cr17Ni4CuNb钢焊接接头的条件疲劳极限可以达到母材的90%以上。疲劳试样断口的扫描电子显微镜观察发现,焊缝表面或近表面的显微缺陷及接头的组织不均匀性是影响05Cr17Ni4Cu4Nb钢焊接接头接头疲劳性能的主要因素。Fatigue property of 05Cr17Ni4Cu4Nb steel used for last stage rotor blade of steam turbine weld joints was studied by means of four-point-bending fatigue test and S-N curve was obtained, compared with parent material at the same time. Results showed that conditional fatigue limit of n5Cr17Ni4Cu4Nb steel weld joints can reach 90% of parent metal using optimized weld and post wehl heat treatment process. SEM observation of fracture surface of fatigue specimen showed that the micro-defect at surface or neat surface and microstructure heterngeneity are the main influence factors of 05Cr17Ni4Cu4Nb weht joints fatigue property.

关 键 词：焊接 05Cr17Ni4Cu4Nb钢 焊接接头 疲劳性能 汽轮机末级动叶片 

分 类 号：TG441[金属学及工艺—焊接]