低压转子叶片叉型叶根销钉开裂原因
Cause of Pin Fracture for Low Pressure Rotor Blade Fork-Type Blade Root
摘 要
某滨海电厂660MW超超临界机中A、B低压转子末二级叶片叉型叶根销钉发生开裂,通过宏、微观形貌观察、化学成分分析、显微组织观察及力学性能测试等方法分析了销钉的开裂原因。结果表明:销钉发生了应力腐蚀开裂。开裂销钉显微组织不均匀,且存在粗晶,其应力腐蚀敏感性较大;销钉孔内存在腐蚀介质,导致销钉表面形成腐蚀坑。在汽轮机高速转动过程中,销钉承受由叶片离心力引起的弯曲应力,在腐蚀坑处萌生微裂纹,发生应力腐蚀开裂。
销钉
腐蚀点坑
弯曲应力
应力腐蚀
fork-type blade root
pin
corrosion pit
bending stress
stress corrosion
Abstract
In a 660 MW ultra-supercritical machine of a coastal power plant, cracking occurred at the end of the secondary blade fork-type blade root pins of the A and B low-pressure rotors, and the cracking causes of the pins were studied by macro/micromorphology observation, chemical composition analysis, microstructure observation and mechanical property tests. The results show that stress corrosion cracking occurred in the pin. The microstructure of cracking pin steel was uneven, and macroscopic coarse grains existed. The stress corrosion sensitivity of the material was higher. Corrosive media existed in the pin hole, which caused corrosion pits forming on the surface of the pin. The corrosion products contained chlorine, sulfur and other elements. In the process of high-speed rotation of the steam turbine, the pin bore the bending stress caused by the centrifugal force of the blades, and microcracks germinated at the corrosion pit. Stress corrosion cracking occurred.
中图分类号 TG172.3 DOI 10.11973/jxgccl202212015
所属栏目 失效分析
基金项目
收稿日期 2021/7/7
修改稿日期 2022/11/9
网络出版日期
作者单位点击查看
备注邓辉(1991-),男,河南郑州人,工程师,硕士
引用该论文: DENG Hui,WU Wensheng,WU Xuliang,YUAN Hongyu,XIE Zhaozeng. Cause of Pin Fracture for Low Pressure Rotor Blade Fork-Type Blade Root[J]. Materials for mechancial engineering, 2022, 46(12): 91～97
邓辉,吴文生,吴旭良,袁红玉,谢照增. 低压转子叶片叉型叶根销钉开裂原因[J]. 机械工程材料, 2022, 46(12): 91～97
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【3】李益民,杨百勋,史志刚,等.汽轮机转子事故案例及原因分析[J].汽轮机技术,2007,49(1):66-69. LI Y M,YANG B X,SHI Z G,et al.Accidants cases and reasons analysis of turbine rotors[J].Turbine Technology,2007,49(1):66-69.
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【6】周正强,郑宏晔,胡洁梓,等.135 MW机组低压末级叶片裂纹原因分析[J].汽轮机技术,2019,61(6):479-480. ZHOU Z Q,ZHENG H Y,HU J Z,et al.Analysis of cracks on 135 MW unit low-pressure last-stage blade[J].Turbine Technology,2019,61(6):479-480.
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【10】霍如恒,郝艳红,张晓,等.捷制200 MW汽轮机高压第二压力级动叶片销钉断裂原因分析[J].电力学报,2000,15(2):85-88. HUO R H,HAO Y H,ZHANG X,et al.The causes of the pin crippling of the second high pressure stage rotor blade of Czech-made 200 MW units[J].Journal of Electric Power,2000,15(2):85-88.
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【15】田玉新,陆明和,李悦.回火温度对4Cr5MoSiV1钢组织和性能的影响[J].金属热处理,2016,41(4):41-45. TIAN Y X,LU M H,LI Y.Effect of tempering temperature on microstructure and properties of 4Cr5MoSiV1 steel[J].Heat Treatment of Metals,2016,41(4):41-45.
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