电站锅炉给水泵前置泵轴断裂原因分析
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摘要
某电厂机组给水泵启动过程中发生给水泵前置泵轴断裂失效故障,对断口表面进行宏观检测、金相检测、化学成分分析、力学性能及显微组织检测。结果表明:泵轴材料在生产加工过程中热处理不当,泵轴推力盘轴头锁母螺纹根部存在较大的应力集中;给水泵前置泵启停及运行过程中负荷变化频率较大,使得螺纹根部承受较大载荷,3种因素共同作用造成泵轴推力盘轴头锁母螺纹根部萌生裂纹并逐渐扩展,以致整体断裂失效。
The fracture failure of front pump shaft on feed pump in station boiler occurred during the operation of a power plant. The macroscopic examination,metallographic examination, chemical composition analysis, mechanical properties and scanning electron microscopic examination were used on the fracture surface. The experiments showed that the improper heat treatment of pump shaft material, the large stress concentration occurred at the root of the screw thread at the thrust disk head of pump shaft, and the variable load during the start-up and shutdown of the feed pump front-end pump and the operation process was endured by the root of the screw thread.And the three factors led the initiation of cracks along the root of the screw thread of the thrust disk head of the pump shaft, and the cracks gradually expanded and led to the overall fracture.
The fracture failure of front pump shaft on feed pump in station boiler occurred during the operation of a power plant. The macroscopic examination,metallographic examination, chemical composition analysis, mechanical properties and scanning electron microscopic examination were used on the fracture surface. The experiments showed that the improper heat treatment of pump shaft material, the large stress concentration occurred at the root of the screw thread at the thrust disk head of pump shaft, and the variable load during the start-up and shutdown of the feed pump front-end pump and the operation process was endured by the root of the screw thread.And the three factors led the initiation of cracks along the root of the screw thread of the thrust disk head of the pump shaft, and the cracks gradually expanded and led to the overall fracture.
引文
[1]李莹,刘高远,张立新.某汽车车轮半轴断裂失效分析[J].失效分析与预防,2007(2):40-44.
[2]雷旻,梁益龙,万明攀,等.减速机高速齿轮轴断裂失效分析[J].金属热处理,2007(增刊):234-238.
[3]马小明,李靖.汽轮机调速器轴断裂失效分析[J].热加工工艺,2012,41(4):204-206.
[4]樊伟刚,张辉,牛红莲,等.9Cr18MoV钢丝杠耳轴断裂失效分析[J].理化检验(物理分册),2014,50(8):603-605.
[5]阎光宗,徐雪霞,孙澎.40Cr钢磨煤机轴断裂失效分析[J].金属热处理,2011,36(9):104-105.
[6]韩成树,夏明六.汽轮机轴断裂失效分析[J].山东化工,2018,47(6):94-95.
[7]全国钢标准化技术委员会.不锈钢棒:GB/T 1220-2007[S].北京:中国标准出版社,2007.
[8]刘爽,姜春娟,王斐斐,等.200 MW汽轮机凝结水泵泵轴断裂失效分析[J].山东电力技术,2015,42(7):55-57.
[9]赵国钦,郑桂波.火电厂凝结水泵轴系断裂分析[J].广东电力,2016,29(11):31-35.
[2]雷旻,梁益龙,万明攀,等.减速机高速齿轮轴断裂失效分析[J].金属热处理,2007(增刊):234-238.
[3]马小明,李靖.汽轮机调速器轴断裂失效分析[J].热加工工艺,2012,41(4):204-206.
[4]樊伟刚,张辉,牛红莲,等.9Cr18MoV钢丝杠耳轴断裂失效分析[J].理化检验(物理分册),2014,50(8):603-605.
[5]阎光宗,徐雪霞,孙澎.40Cr钢磨煤机轴断裂失效分析[J].金属热处理,2011,36(9):104-105.
[6]韩成树,夏明六.汽轮机轴断裂失效分析[J].山东化工,2018,47(6):94-95.
[7]全国钢标准化技术委员会.不锈钢棒:GB/T 1220-2007[S].北京:中国标准出版社,2007.
[8]刘爽,姜春娟,王斐斐,等.200 MW汽轮机凝结水泵泵轴断裂失效分析[J].山东电力技术,2015,42(7):55-57.
[9]赵国钦,郑桂波.火电厂凝结水泵轴系断裂分析[J].广东电力,2016,29(11):31-35.