汽动给水泵平衡盘开裂原因分析
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摘要
开展宏观检查、拉伸性能试验、硬度试验和金相检验等对某核电厂汽动给水泵平衡盘发生开裂的原因进行分析。分析结果表明,堆焊层内部裂纹在冲击载荷下发生扩展,并延伸至堆焊层表面。从焊缝内部裂纹的形貌和位置来看,为典型的焊接热裂纹。
Macroscopic examination, tensile property test, hardness test, metallographic inspection and other detection means were carried out to analyze the cracking reason of the balance disk of steam-drive pump in a nuclear power plant. The analysis results show that the crack of surfacing layer is extended to the surface of surfacing layer under impact loading. It is typical welding hot cracking judging from the morphology and position of the crack in the weld.
Macroscopic examination, tensile property test, hardness test, metallographic inspection and other detection means were carried out to analyze the cracking reason of the balance disk of steam-drive pump in a nuclear power plant. The analysis results show that the crack of surfacing layer is extended to the surface of surfacing layer under impact loading. It is typical welding hot cracking judging from the morphology and position of the crack in the weld.
引文
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[2]赵万勇,王钊,王磊,等.多级泵平衡盘动态平衡研究与数值仿真[J].机械工程学报,2013,49(4):163-167.
[3]成宏伟.汽动给水泵平衡装置的磨损原因分析与处理[J].电站辅机,2010,31(1):32-35.
[4]李春,薛武智.平衡盘的动态性能研究[J].河南科技大学学报:自然科学版,2008,29(4):39-41.
[5] Lippoid J C.焊接冶金与焊接性[M].屈朝霞,张汉谦,王东波,译.北京:机械工业出版社,2017:62-95.
[6]尹士科,李凤辉.不锈钢及耐热耐蚀合金焊接热裂纹概述[J].焊接,2002(10):40-43.
[7]钟定铭,刘建国,银锐明,等.堆焊金属裂纹形成机理研究[J].株洲工学院学报,2002, 16(6):93-95.
[8]周细应,柯黎明,华小珍,等.堆焊界面特征与裂纹形成之间的关系研究[J].兵器材料科学与工程,2001,24(6):18-21.
[9]徐晓,颜波,张河清.阀门堆焊产生气孔和裂纹原因的分析[J].焊接, 2000(5):24-26.
[10]王丽华,惠渊博.预热对夹送辊堆焊裂纹的影响[J].热加工工艺,2006,35(19):28-30.