Causes Analysis on Cracking of Shaft of Water-feeding Fore Pump of Power Unit
摘 要
某火电厂4号机组B给水前置泵轴投运仅19h即发生断裂。经对断裂泵轴进行宏观分析、化学成分分析、常温力学性能测试、金相检验及断口扫描电镜分析,探讨并明确了泵轴断裂原因,同时提出了防范措施。结果表明:该给水前置泵轴断裂为疲劳断裂,在弯曲及扭转载荷作用下于变截面的应力集中部位的不连续及夹杂物处形成疲劳裂纹,同时大量夹杂物及沿晶分布的粗大α铁素体的存在严重降低了基体强度,使轴体所能承受的循环应力大大降低,即在较低的循环应力作用下疲劳裂纹不断扩展并最终断裂。
Abstract
The shaft of B water-feeding fore pump of a power unit fractured after operation only for 19h.Thefracture reasons of the pump shaft were studied by means of macro examination,chemical compositions analysis,room-temperature mechanical properties test,metallographic examination and fracture SEM analysis,and preventivemeasures were put forward.The results show that the fracture of the pump shaft was fatigue fracture.The fatiguecracks generated from the surface incontinuity and inclusions where stress concentration produced because of variablecross-section,when the pump shaft working under the action of flexural and torsional stress.In the meantime,thestrength of the pump shaft was reduced greatly because of lots of inclusions and freeα-ferrite.So fatigue cracksspread quickly in low cyclic stress condition and the pump shaft fractured finally.
中图分类号 TG115 TK225
所属栏目 质量控制与失效分析
基金项目
收稿日期 2013/4/4
修改稿日期
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备注张涛(1982-),男,工学硕士。
引用该论文: ZHANG Tao,WEI Zhi-gang,TIAN Li-nan,SHAN Li-feng,LI Hong,CHEN Hao,HOU Guo-xin,CUI Yuan-yuan. Causes Analysis on Cracking of Shaft of Water-feeding Fore Pump of Power Unit[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2013, 49(12): 848~851
张涛,卫志刚,田力男,单利峰,李红,陈浩,侯国新,崔圆圆. 火电机组给水前置泵轴断裂原因分析[J]. 理化检验-物理分册, 2013, 49(12): 848~851
被引情况:
【1】杨星红,王荣, "电梯驱动轴断裂原因分析",理化检验-物理分册 50, 292-295(2014)
【2】万瑜,杨超,李烨, "超超临界锅炉捞渣机圆环链断裂分析",理化检验-物理分册 51, 493-496(2015)
【3】王东超, "直缝埋弧焊钢管背弯不合格原因分析",理化检验-物理分册 50, 507-511(2014)
【4】张涛,高云鹏,田峰,陈浩,马喜成, "电站汽动给水泵0Cr13Ni4Mo不锈钢主轴断裂失效分析",理化检验-物理分册 51, 725-729(2015)
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参考文献
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【4】VISHNEVSKY C,STCIGERWALD E A.Influenceof alloying elements on the toughness of low alloy mar-tensitic high strength steels[R] //Report CR 68-09(F).Watertown:Army Materials and Mechanics Re-search Center,1968.
【5】DAHL W,KRETZCHMANN W B.Influence of pre-cracking and grain size on fracture toughness of struc-ture steels[J]. Fracture,1977,2A:17-21.
【6】GB/T 10561-2005钢中非金属夹杂物含量的测定 —— 标准评级图显微检验法[S].
【7】常建伟,李凤辉,徐德录,等.输电铁塔主材低温失效分析[J]. 电力建设,2012,33(3):86-88.
【8】樊彬彬,陈红冬,刘纯.500kV输电线路铁塔横担变形材质检测及失效分析[J]. 湖南电力,2009,29(4):18-22.
【9】张学彬,廖振华,蒋月娟,等.40Cr钢机油泵轴断裂原因分析[J]. 理化检验-物理分册,2010,46(4):257-262.
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【11】美国金属学会.金属手册 第十卷 失效分析与预防[M]. 北京:机械工业出版社, 1986.
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