Cause of Crack in Rotor Blade of Aero-Engine Shouldered Fan
摘 要
某航空发动机TC4合金风扇转子叶片凸肩根部转接部位过早产生裂纹,通过宏观形貌观察、断口分析以及接触放电试验,分析了裂纹产生原因。结果表明:失效风扇转子叶片裂纹为疲劳裂纹,裂纹萌生于叶片叶盆侧凸肩根部至排气边的转接区域表面;在叶片凸肩耐磨层钎焊过程中,感应线圈靠近或接触叶片基体而发生接触放电,导致叶片基体局部熔化烧伤和阻流剂熔化,是叶片萌生疲劳裂纹的原因。建议采用绝缘胶布对感应线圈进行绝缘处理,选取合适的感应电流和焊接距离,以防止线圈与叶片之间发生接触放电。
Abstract
Cracks were produced prematurely in the transition area of the shoulder root of TC4 alloy fan rotor blade of an aero-engine. The cause of the cracks was studied through macromorphology observation, fracture analysis and contact discharge test. The results show that the cracks of the failed fan rotor blades were fatigue cracks, and initiated on the surface of the transition area from the root of the leaf pot side shoulder to the exhaust edge. The induction coil closed or contacted the blade substrate and contact discharge occurred, resulting in local melting and burning of the blade substrate and melting of the flow blocking agent during the brazing process of the wear-resistant layer of the blade shoulder, which was the cause of fatigue crack initiation of the blade. It was suggested that insulating the induction coil by insulating tape and using an appropriate induction current and welding distance to prevent contact discharge between the coil and the blade.
中图分类号 V232.4 DOI 10.11973/jxgccl202104018
所属栏目 失效分析
基金项目
收稿日期 2020/4/13
修改稿日期 2021/1/4
网络出版日期
作者单位点击查看
备注刘欢(1986-),男,辽宁阜新人,工程师,硕士
引用该论文: LIU Huan,TONG Wenwei,ZHANG Shuang,ZHANG Kaikuo,LI Yanming. Cause of Crack in Rotor Blade of Aero-Engine Shouldered Fan[J]. Materials for mechancial engineering, 2021, 45(4): 99~102
刘欢,佟文伟,张爽,张开阔,李艳明. 航空发动机带凸肩风扇转子叶片裂纹产生原因[J]. 机械工程材料, 2021, 45(4): 99~102
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参考文献
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【3】郭星辉,魏伟明.凸肩叶片的振动响应[J].东北大学学报(自然科学版),2006,27(3):344-347. GUO X H, WEI W M. Vibration response of shrouded blades[J]. Journal of Northeastern University (Natural Science), 2006,27(3):344-347.
【4】王乐安.国外航空发动机风扇叶片及其成形技术[J].航空科学技术,1995,6(1):31-33. WANG L A. Foreign aero-engine fan blade and its forming technolgy[J]. Aeronautical Science and Technology, 1995,6(1):31-33.
【5】佟文伟.航空发动机风扇叶片裂纹失效分析[J].失效分析与预防,2013,8(2):112-116. TONG W W, Failure analysis of cracks of fan blade in an aeroengine[J]. Failure Analysis and Prevention, 2013,8(2):112-116.
【6】孙立.发动机冷端部件的修理[J].航空维修与工程,2010(3):29-30. SUN L. Enigne's cold section repairs[J]. Aviation Maintenance & Engineering, 2010(3):29-30.
【7】张海洋,曹航,李洋,等.风扇叶片凸肩工作面裂纹起始原因分析[J].航空发动机,2015,41(6):44-48. ZHANG H Y, CAO H, LI Y, et al. Analysis on initial crack reason of shrouded fan blade contact surface[J]. Aeroengine,2015,41(6):44-48.
【8】刘庆瑔.航空发动机钛合金叶片制造技术及失效分析[M].北京:航空工业出版社,2018. LIU Q Q. Aero-engine titanium alloy blade manufacturing technology and failure analysis[M]. Beijing:Aviation Industry Press, 2018.
【9】陈亚莉,侯会文,闫沙林.某型涡扇发动机风扇叶片外场抢修技术研究[J].航空发动机,2009,35(2):54-55. CHEN Y L, HOU H W, YAN S L. Field repairing technology of fan blades for a turofan engine[J]. Aeroengine, 2009,35(2):54-55.
【10】芦才军,李印,王波.带凸肩叶片的断裂故障分析[J].航空维修与工程,2016(6):48-50. LU C J, LI Y, WANG B. Analysis on fracture fault in shrouded blade[J]. Aviation Maintenance & Engineering, 2016(6):48-50.
【11】刘博志,佟文伟,邱丰,等.发动机风扇转子叶片叶身裂纹分析[J].失效分析与预防,2016,11(1):60-64. LIU B Z, TONG W W, QIU F, et al. Cracking analysis of fan blade in an aero-engine[J]. Failure Analysis and Prevention, 2016,11(1):60-64.
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