某发动机涡轮叶片缘板掉块原因
Falling Block Causes of Turbine Blade Edge Plate in an Engine
摘 要
某发动机涡轮叶片在试车过程中缘板处出现掉块和裂纹。采用宏观分析、低倍腐蚀、断口分析等方法对涡轮叶片缘板处的掉块原因进行了分析。结果表明：涡轮叶片缘板出现掉块和裂纹性质为持久断裂失效，涡轮叶片缘板裂纹产生原因与缘板位置小角度晶界角度过大有关。建议将此型涡轮叶片的小角度晶界技术条件要求由不大于8°提高到不大于6°。
缘板
掉块
小角度晶界
turbine blade
edge plate
falling block
low-angle grain boundary
Abstract
During the test run of an engine turbine blade, some falling blocks and cracks appeared at the edge plate. Macro analysis, macrocorrosion and fracture analysis were used to analyze the causes for the falling block at the turbine blade edge plate. The results show that the quality of turbine blade edge plate falling block and crack was permanent fracture failure, and the cause of turbine blade edge plate crack was related to the angle of low-angle grain boundary at edge plate was too large. It is suggested that the technical requirements for low-angle grain boundary of this turbine blade should be raised from no more than 8° to no more than 6°.
中图分类号 V232.4 DOI 10.11973/lhjy-wl202104015
所属栏目 质量控制与失效分析
基金项目
收稿日期 2020/6/10
修改稿日期
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备注刘丽玉(1983-),女,高级工程师,主要从事金属材料失效分析工作,liuliyu@yahoo.cn
引用该论文: LIU Liyu,ZHANG Jian,XIONG Jichun,CHEN Jun. Falling Block Causes of Turbine Blade Edge Plate in an Engine[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2021, 57(4): 58～62
刘丽玉,张剑,熊继春,陈俊. 某发动机涡轮叶片缘板掉块原因[J]. 理化检验－物理分册, 2021, 57(4): 58～62
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【3】曹亮,周亦胄,金涛,等.晶界角度对一种镍基双晶高温合金持久性能的影响[J].金属学报,2014,50(1):11-18.
【4】SHI Z X, LI J R, LIU S Z, et al. Effect of LAB on the stress rupture properties and fracture characteristic of DD6 single crystal superalloy[J].Rare Metal Materials and Engineering,2012,41(6):962-966.
【5】吴文津,姜华,陈晶阳,等.第一代镍基高温合金的小角度晶界组织及室温拉伸性能[J].金属热处理,2018,43(7):79-83.
【6】赵金乾,李嘉荣,刘世忠,等.小角度晶界对单晶高温合金DD6拉伸性能的影响[J].材料工程,2008(8):73-76.
【7】刘丽玉,杨宪锋,张兵,等.从典型失效案例探讨单晶叶片的工程应用问题[J].失效分析与预防,2016,11(5):327-335.
【8】SHI Z X, LI J R, LIU S Z, et al.Formation mechanism of low angle boundary of DD6 single crystal superalloy blades[J].Advanced Materials Research,2012,535:1019-1022.
【9】赵金乾,李嘉荣,刘世忠,等.小角度晶界对DD6单晶高温合金980℃拉伸性能的影响[J].稀有金属材料与工程,2007,36(12):2232-2235.
【10】刘昌奎,杨胜,何玉怀,等.单晶高温合金断裂特征[J].失效分析与预防,2010,5(4):225-230.
【11】史振学,刘世忠,赵金乾,等.小角度晶界对单晶高温合金高周疲劳性能的影响[J].材料热处理学报,2015, 36(增刊):52-56.
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