摘要
某型发动机Ⅳ级导向器在服役过程中出现裂纹,为满足航空发动机使用可靠性及确保直升机的飞行安全,对Ⅳ级导向器出现的裂纹故障进行焊接修复研究。通过扫描电镜和光学显微镜对Ⅳ级导向器裂纹进行分析,判断零件裂纹失效的原因,使用高温箱式炉对Ⅳ级导向器进行恢复性能热处理,采用氩弧焊对裂纹进行焊接修复,对比评估修复前后微观组织、硬度、高温强度以及热冲击性能变化关系,对修复后的Ⅳ级导向器装于发动机进行试车考核验证。结果表明:Ⅳ级导向器在使用过程中在晶界处产生σ相,大量的σ相导致晶界性能下降,最终产生晶间腐蚀裂纹。恢复性能热处理可以解决材料脆化和焊接性降低的问题,氩弧焊修复的Ⅳ级导向器的焊接接头满足标准要求。通过恢复性能热处理、氩弧焊修复和稳定化处理去除焊接应力的Ⅳ级导向器各尺寸满足发动机装配要求,经试车考核后无裂纹、掉块等异常。
In order to meet the reliability of an aero-engine and ensure the flight safety of helicopter,the welding repair of the crack fault of theⅣ-stage guide vanes is studied.The cracks are observed by scanning electron microscopy and optical microscopy to analyze the root causes of guide vanes failure.The high temperature box furnace is used to conduct properties recovery heat treatment ofⅣ-stage guide vanes.The cracks are repaired by TIG(Tungsten Inert Gas)welding.The microstructure,hardness,high temperature strength and thermal shock performance before and after repair are compared and evaluated.The repairedⅣ-stage guide vanes are installed on the engine for test verification.The results show that a large amount ofσphase is generated at grain boundary during service,decreases the strength of grain boundary,and finally corrosion cracks are generated.Properties recovery heat treatment can lower the brittleness and improve the weldability of matrix materials.The welded joint ofⅣ-stage guide vanes produced by TIG welding meets the standard requirements.The dimensions ofⅣ-stage guide vanes,on which property recovery heat treatment,TIG welding and stabilization treatment are conducted,meet the requirements of engine assembly.No cracks,spalling or other abnormalities are detected after engine test.
作者
许世明
周俊
李威
林开章
魏清
葛海锋
XU Shiming;ZHOU Jun;LI Wei;LIN Kaizhang;WEI Qing;GE Haifeng(Chengdu State-owned Jinjiang Machine Factory,Chengdu 610043,China)
出处
《航空工程进展》
2025年第4期133-140,共8页
Advances in Aeronautical Science and Engineering
关键词
固溶处理
晶间腐蚀
热冲击试验
裂纹
焊接修复
Ⅳ级导向器
solution treatment
intercrystalline corrosion
thermal shock test
crack
welding repair
Ⅳ-stage guide vanes
