Influence of deformation-induced alpha prime martensite on the crack initiation mechanism in a metastable austenitic steel in the HCF and VHCF regime

【Author】

Martina Zimmermann;Andrei Gngorescu;Carsten Mueller-Bollenhagen;Hans-Juergen Christ;

【Abstract】

<正>Fatigue failure in the VHCF regime of high strength steels is dominated by subsurface crack initiation around non-metallic inclusions with fisheye fracture morphology.However,this unique failure mechanism can not be thoroughly confirmed for metastable austenitic steel 1.430 1 (AISI 304),for its crack origin is heavily dependant on fatigue life and its amount of deformation-induced alpha prime martensite.In the HCF regime cracks originate at the specimen surface from inclusions exceeding 0.02 mm,irrespective of the volume fraction of deformation-induced alpha prime martensite.For a volume fraction beyond V_M=30%the higher notch sensitivity of the martensite phase can lead to crack initiation at micro flaws at the surface.In the VHCF regime the influence of

【Keywords】

HCF;Influence of deformation-induced alpha prime martensite on the crack initiation mechanism in a metastable austenitic steel in th;

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