燃气涡轮发动机12Cr2Ni4A渗碳钢鼠笼弹性支承开裂原因  

Cracking Causes of 12Cr2Ni4A Carburizing Steel Squirrel Cage Elastic Support of Gas Turbine Engine

作　　者：王全 刘博 佟文伟 李青 陈基东 马健 WANG Quan;LIU Bo;TONG Wenwei;LI Qing;CHEN Jidong;MA Jian(AECC Shenyang Engine Research Institute,Shenyang 110015,China;AECC Chengdu Engine(Group)Co.,Ltd.,Chengdu 610500,China)

机构地区：[1]中国航发沈阳发动机研究所,沈阳110015 [2]中国航发成都发动机有限公司,成都610503

出　　处：《机械工程材料》2025年第1期120-126,共7页Materials For Mechanical Engineering

基　　金：航空动力基础研究资助项目。

摘　　要：某燃气涡轮发动机的12Cr2Ni4A渗碳钢鼠笼弹性支承笼条出现开裂,采用宏微观形貌观察、能谱分析、断口分析、化学成分检测、有限元受力分析以及疲劳和腐蚀模拟试验等方法,分析了开裂的性质和原因。结果表明:笼条开裂性质为在浅表层晶间腐蚀裂纹基础上产生的应力腐蚀开裂;鼠笼弹性支承在除铜工艺中经历了过腐蚀环境,出现浅表层晶间腐蚀,同时存在的机加残余应力导致应力腐蚀开裂,笼条较高的强度促进应力腐蚀开裂。Multipe 12Cr2Ni4A carburizing steel squirrel cage elastic support strips cracked of a gas turbine engine.The cracking properties and causes were analyzed by macro and micro morphology observation,energy spectrum analysis,fracture analysis,chemical composition detection,finite element force analysis and fatigue and corrosion simulation tests.The results show that the cage strip cracking property was stress corrosion cracking occuring on the basis of superficial intergranular corrosion cracking.The cracked squirrel cage elastic support experienced excessive corrosion environment in the copper removal process,resulting in shallow intergranular corrosion.At the same time,the mechanical residual stress caused stress corrosion carcking and the high strength of the cage strip promoted stress corrosion cracking.

关 键 词：鼠笼弹性支承 晶间腐蚀 应力腐蚀开裂 工艺优化 燃气涡轮发动机 

分 类 号：V232.4[航空宇航科学与技术—航空宇航推进理论与工程]