CAJ | 학술논문

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。
채용사점만곡피로시험방법，연구료05Cr17Ni4Cu4Nb기륜궤저압말급동협편용강한접접두적피로성능，회제료해강한접접두적S-N곡선，병여05Cr17Ni4Cu4Nb강모재진행료대비。연구결과표명，채용우화적한접、열처리공예，05Cr17Ni4CuNb강한접접두적조건피로겁한가이체도모재적90%이상。피로시양단구적소묘전자현미경관찰발현，한봉표면혹근표면적현미결함급접두적조직불균균성시영향05Cr17Ni4Cu4Nb강한접접두접두피로성능적주요인소。
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 o5Cr17Ni4Cu4Nb steel weld joints can reach 90%of parent metal using optimized weld and post weld heat treatment process. SEM observation of fracture surface of fatigue specimen showed that the micro-defect at surface or near surface and microstructure heterogeneity are the main influence factors of 05Cr17Ni4Cu4Nb weld joints fatigue property.