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FailureAnalysisonAxialCrackingofa£´£²CrMoSteelHighStrengthBolt
TENG Wei£±,LIANGBo£±,SUNXiao£Çting
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(£±£®CRRCDalianCo£®,Ltd£®,Dalian£±£±£¶£°£²£²,China;£²£®DalianJiaotongUniversity,Dalian£±£±£¶£°£°£°,China)
Abstract:A£¸£®£¸gradehighstrengthboltmadefrom £´£²CrMosteelcrackedalongtheaxisduringthread
rollingprocessafterheattreatmentandthecrackingcausesofthebolt wereanalyzedby meansofchemical
compositionanalysis,macroexaminationandmetallographicexamination£®Theresultsshowthatthecrackingofthe
boltwasmainlyduetothattherewaslineardistributionforgingfolddefectintheraw materialsurfacebeforeheat
treatment£®Andtheforgingfolddefectcausedstressconcentrationandbecameacrackingsourcewhenquenching,
whichinducedtheaxialcrackingoftheboltundertheactionofpowerfulquenchingstressandrollingstress£®
Keywords:highstrengthbolt;axialcracking;forgingfolddefect;stressconcentration;quenchingcracking
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