某火电厂高速渗碳齿轮轮齿断裂原因
Fracture Cause of High-Speed Carburized Gear Tooth in a Thermal Power Plant
摘 要
某火电厂给水泵耦合器二级从动渗碳齿轮多处轮齿发生断裂。通过宏/微观形貌观察、化学成分检测、金相检验以及力学性能测试等方法分析了轮齿断裂原因。结果表明：轮齿齿面处渗碳层表面硬度不足，耐磨性能和抗疲劳性能较差，在接触应力长期反复作用下，轮齿齿面表层金属剥落形成麻坑，同时齿轮组织中存在白点缺陷，材料的综合力学性能不足；在齿轮高速转动过程中，齿面受接触应力作用，裂纹在剥落麻坑周围应力集中处萌生并迅速扩展，导致轮齿发生脆性断裂。
渗碳层
剥落麻坑
白点缺陷
脆性断裂
high-speed gear
carburized layer
spalling pit
flake defect
brittle fracture
Abstract
Several gear teeth of a secondary driven carburized gear for a feed water pump coupler in a thermal power plant were broken.The fracture cause of gear teeth was analyzed by macro and micro morphology observation, chemical composition measuring, metallographic inspection and mechanical property testing.The results show that the surface hardness of the carburized layer of the gear tooth flank was insufficient, and the wear resistance and fatigue resistance were poor.The surface metal of the gear tooth flank peeled off to form spalling pits under long-term repeated contact stresses.Meanwhile flake defects existed in the microstructure of the gear.The comprehensive mechanical properties of the material were inadequate.During the high-speed rotation of the gear, the tooth flank was subjected to contact stresses, and cracks were initiated at stress concentration areas around the spalling pits and expanded rapidly, resulting in the brittle fracture of the gear teeth.
中图分类号 TG142.4 DOI 10.11973/jxgccl202112017
所属栏目 失效分析
基金项目
收稿日期 2021/3/3
修改稿日期 2021/11/23
网络出版日期
作者单位点击查看
备注彭波(1992-)，男，湖南常德人，工程师，硕士
引用该论文: PENG Bo,ZHANG Bin,ZHANG Chuanzheng,SONG Zibo,HAN Zhewen,LI Ling,WANG Zhichun. Fracture Cause of High-Speed Carburized Gear Tooth in a Thermal Power Plant[J]. Materials for mechancial engineering, 2021, 45(12): 93～98
彭波,张斌,张传正,宋子博,韩哲文,李玲,王智春. 某火电厂高速渗碳齿轮轮齿断裂原因[J]. 机械工程材料, 2021, 45(12): 93～98
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【5】高金柱,顾敏,王爱香,等.常用典型齿轮钢渗碳层的组织与性能[J].机械工程材料,2012,36(2):49-51. GAO J Z,GU M,WANG A X,et al.Microstructure and property of carbonization layer in common and typical gear steels[J].Materials for Mechanical Engineering,2012,36(2):49-51.
【6】姜荣国,王强,李若辉,等.风电齿轮箱小齿轮齿面剥落原因分析[J].腐蚀科学与防护技术,2016,28(2):154-159. JIANG R G,WANG Q,LI R H,et al.Failure analysis of flakes fell from small gear surface in wind power gearbox[J].Corrosion Science and Protection Technology,2016,28(2):154-159.
【7】马小明,伍聂修.大功率风力发电机增速齿轮断裂原因分析[J].机械工程材料,2011,35(7):93-95. MA X M,WU N X.Failure analysis on boost gear of A large capacity wind power generator[J].Materials for Mechanical Engineering,2011,35(7):93-95.
【8】马爱庆.减速器齿轮发生点蚀的分析[J].煤炭技术,2006,25(2):22-24. MA A Q.Stop-down gear has pitting analysis[J].Coal Technology,2006,25(2):22-24.
【9】孙秀荣,刘贵才.对钢中白点缺陷的讨论及扫描电镜观察[J].物理测试,2016,34(1):39-42. SUN X R,LIU G C.Discussion and SEM observation of flakes in steels[J].Physics Examination and Testing,2016,34(1):39-42.
【10】牛立群,许敬月,杨德生,等.42CrMo钢锻件的白点研究[J].大型铸锻件,2017(3):30-32. NIU L Q,XU J Y,YANG D S,et al.Study on flake of 42CrMo steel forgings[J].Heavy Castings and Forgings,2017(3):30-32.
【11】刘庆兰,程里,王春莉.大型输出齿轮轴断齿分析[J].理化检验(物理分册),2007,43(3):156-158. LIU Q L,CHENG L,WANG C L.Gear teeth broken analysis of heave-duty output gear axle[J].Physical Testing and Chemical Analysis (Part A:Physical Testing),2007,43(3):156-158.
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