航空发动机涡轮盘用GH4133B合金疲劳裂纹萌生与短裂纹扩展研究_赵荣国.pdf

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1、第49卷第10期机械工程学报Vol.49No.102013年5月JOURNALOFMECHANICALENGINEERINGMay2013DOI：10.3901/JME.2013.10.116航空发动机涡轮盘用GH4133B合金疲劳裂纹萌生与短裂纹扩展研究112113赵荣国李红超蒋永洲谭敦厚李俊斐罗希延(1.湘潭大学土木工程与力学学院湘潭411105；2.空军航空大学航空理论系长春130022；3.中国航空工业集团黎阳航空发动机公司安顺561102)摘要：疲劳裂纹萌生与短裂纹扩展研究是航空发动机构件损伤容限设计的关键和基础。针对航空发动机涡轮盘用GH4

2、133B合0.5金，开展室温下不同缺口半径、不同应力比的疲劳裂纹萌生和短裂纹扩展研究，结果表明控制参量ΔKI/(rρ)可较好地表征疲劳裂纹萌生寿命，且随控制参量值的增大，缺口半径对疲劳裂纹萌生寿命的影响增大，而疲劳裂纹萌生寿命随应力比的增大呈先增后减趋势。采用有效应力强度因子范围ΔKeff，能较好地描述短裂纹扩展速率随裂纹扩展先减速后加速的特性。疲劳失效断口的扫描电镜观测表明，短裂纹扩展区的放射性条纹之间存在解理台阶，且解理台阶上有早期疲劳条带，从而从断裂表面形貌分析角度，揭示了GH4133B合金在疲劳裂纹扩展初期速率较高，而后扩展速率逐渐下降的短裂纹

3、扩展微观机理。关键词：涡轮盘疲劳裂纹萌生短裂纹扩展应力比断口分析中图分类号：TG115TH135ResearchonFatigueCrackInitiationandShortCrackPropagationofGH4133BSuperalloyUsedinTurbineDiskofAero-engine112113ZHAORongguoLIHongchaoJIANGYongzhouTANDunhouLIJunfeiLUOXiyan(1.CollegeofCivilEngineeringandMechanics,XiangtanUniversity,X

4、iangtan411105;2.DepartmentofAviationTheory,AirForceAviationUniversity,Changchun130022;3.LiyangAero-EngineCorporation,AviationIndustryCorporationofChina,Anshun561102)Abstract：Fatiguecrackinitiationandshortcrackpropagationisthekeyandfoundationofdamagetolerancedesignofaero-engineco

5、mponents.TheresearchesonfatiguecrackinitiationandshortcrackpropagationunderdifferentnotchradiiandstressratiosforGH4133Bsuperalloyusedinturbinediskofaero-enginearecarriedoutatambienttemperature.Itisshownthatacontrol0.5parameterΔKI/(rρ)canbeusedtocharacterizethefatiguecrackinitiat

6、ionlife,andtheeffectofnotchradiusonfatiguecrackinitiationlifeincreaseswithincreasingcontrolparameter,whilethefatiguecrackinitiationlifefirstlyincreasesandthendecreaseswithincreasingstressratio.AneffectivestressintensityfactorrangeΔKeff,canbeadoptedtodescribethedecelerationandacc

7、elerationofcrackgrowthrateduringtheshortcrackpropagation.Thefatiguefracturesurfacemorphologiesareinvestigatedusingscanningelectronmicroscopy.Itisshownthatthereisacleavagestepbetweentwoadjacentradialstripes,andaseriesofearlyfatiguestriationsexistonthecleavagestep,whichrevealsthem

8、icroscopicmechanismofshortcrackpropagationfromt