文献类型：期刊文献

中文题名：汽轮机转子钢的应力腐蚀敏感性

英文题名：Stress Corrosion Sensitivity of Steam Turbine Rotor Steel

作者：林淑娴[1];黄毓晖[1];轩福贞[1];涂善东[1]

机构：[1]华东理工大学承压系统与安全教育部重点实验室,上海200237

年份：2020

卷号：41

期号：3

起止页码：1

中文期刊名：腐蚀与防护

外文期刊名：Corrosion & Protection

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；

基金：上海市自然科学基金(16ZR1408300);国家自然科学基金(51875202)。

语种：中文

中文关键词：低压转子钢;慢应变速率试验;应力腐蚀敏感性;开裂机理

外文关键词：low-pressure rotor steel;slow strain rate test(SSRT);stress corrosion sensitivity;cracking mechanism

摘要：模拟了核电汽轮机低压转子的运行工况,对25Cr2Ni2MoV、26NiCrMoV10-10和30Cr2Ni4MoV三种低压转子钢进行慢应变速率试验,研究不同转子钢的应力腐蚀敏感性差异及影响因素,并采用光学显微镜、扫描电镜和能谱仪等对试样的断口形貌、腐蚀裂纹及氧化膜进行微观分析,探讨汽轮机转子钢常用材料的应力腐蚀开裂(SCC)机理.结果 表明:在180℃、3.5% NaCl溶液中,25Cr2Ni2MoV转子钢的应力腐蚀敏感性最高;而26NiCrMoV10-10和30Cr2Ni4MoV转子钢的SCC敏感性相近;增加钢中Ni元素含量,降低材料的强度,有利于降低材料的SCC敏感性.应变主导的腐蚀开裂中没有发现腐蚀坑,动态应变直接破坏表面氧化膜,促使裂纹萌生,并向金属内部扩展,呈穿晶开裂形式.
The stress corrosion sensitivity of 25Cr2Ni2MoV,26NiCrMoV10-10 and 30Cr2Ni4MoV low-pressure rotor steels in simulated nuclear steam turbine operation condition was investigated through slow strain rate test(SSRT).Fracture morphology,corrosion cracks and oxide films were analyzed by optical microscopy(OM),scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS),and the stress corrosion cracking(SCC)mechanism of common materials of steam turbine rotor steel were discussed.Results revealed that the SCC sensitivity of 25Cr2Ni2MoV steel was the highest in 180℃,3.5%NaCl solution,while the SCC sensitivity of 26NiCrMoV10-10 and 30Cr2Ni4MoV rotor steel were similar.The SCC sensitivity of metal could be decreased by the increase of Ni and the decline of mechanical strength.No pit was discovered,and cracks initiated from metal surface because of the rupture of oxide film caused by dynamic strain and then propagated into the metal,which showed transgranular cracking.