风力发电机组用变桨轴承外圈断裂的原因
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摘要
风力发电机组用变桨轴承外圈在使用一段时间后发生断裂,通过宏观检查、化学成分分析、力学性能测试、断口形貌和显微组织观察等方法分析了断裂原因。结果表明:轴承外圈断裂性质为疲劳断裂;螺栓孔内表面在腐蚀介质作用下产生点蚀坑,形成应力集中点,在较大外力作用下,在应力集中明显的点蚀坑处萌生裂纹并诱发疲劳断裂。
Outer ring of a pitch bearing in a wind turbine generator fractured when used for a period of time.The reason for the fracture was analyzed by methods such as macro-inspection,chemical composition analysis,mechanical property test,fracture morphology and microstructure observation.The results show that the bearing outer ring fractured in a fatigue mode.Pits on inner surface of the bolt hole were generated by corrosive mediums,resulting in stress concentration points.By a relatively large external force,the cracks originated at the pits where existing obvious stress concentration,and consequently led to fatigue fracture.
Outer ring of a pitch bearing in a wind turbine generator fractured when used for a period of time.The reason for the fracture was analyzed by methods such as macro-inspection,chemical composition analysis,mechanical property test,fracture morphology and microstructure observation.The results show that the bearing outer ring fractured in a fatigue mode.Pits on inner surface of the bolt hole were generated by corrosive mediums,resulting in stress concentration points.By a relatively large external force,the cracks originated at the pits where existing obvious stress concentration,and consequently led to fatigue fracture.
引文
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[3]陈龙,杜宏武,武建柯,等.风力发电机用轴承简述[J].轴承,2008(12):45-50.
[4]李媛媛,叶亚飞.风力发电机专用轴承[J].轴承,2004(2):48-49.
[5]王思明,史小辉,许明恒.风力发电机变桨轴承微动磨损与防护[J].润滑与密封,2009,34(12):110-112.
[6]钟群鹏,赵子华.断口学(精)[M].北京:高等教育出版社,2006.
[7]王仁智,吴培远.疲劳失效分析[M].北京:机械工业出版社,1987.
[8]LOU Y Z,LI C Z,LI X D,et al.Surface integrity characteristics and fatigue failure mechanism of carburized M50NiL steel[J].Journal of Aeronautical Materials,2017,37(6):25-33.
[9]杨星红,王荣.不锈钢真空塔开裂失效分析[J].金属热处理,2015,40(增刊1):106-109.
[10]王荣.换热器汽包封头泄漏原因分析[J].理化检验-物理分册,2006,42(11):580-582.
[11]李炯辉.金属材料金相图谱[M].北京:机械工业出版社,2006.