Low-cycle fatigue behavior in metastable austenitic steel accompanying deformation-induced martensitic transformation.
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The effect of deformation-induced martensitic transformation on the strain-controlled low-cycle fatigue behavior in type 304 metastable austenitic stainless steel at room temperature has been studied. The fatigue behavior in type 310 stable austenitic stainless steel has been also examined for comparison. The fatigue life (Nf) of type 304 steel was markedly affected by the α'-martensite formation. When the total strain range (Δεt) was higher than 0.8%, where the α'-martensite formation started before the crack initiation, Nf of type 304 steel was about 1/5 times shorter than that of type 310 steel, when compared at the same Δεp (mean plastic strain range from first cycle to final cycle). This shorter Nf of type 304 steel was attributed to the increase in σt (mean cyclic tensile stress) due to the α'-martensite formation and to the martensite acting as the preferential site of crack initiation. The degree of decrease in Nf was larger when the α'-martensite formation started in the strain hardening stage than in the saturated stress stage of fatigue process, in connection with the larger increase in σt. At low Δεt such as 0.6% where the α'-martensite formation started after the crack initiation, Nf of type 304 steel was about 2 times longer than that of type 310 steel. This longer Nf, of type 304 steel was attributed to the suppression of crack propagation due to the α'-martensites fomed around the crack tip. The experimental data of Nf fell in the range of factor of 2 of the predicted Nf which were obtained on the basis of Tomkins' model by taking into consideration the increase in σt due to the α'-martensite formation.
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The Iron and Steel Institute of Japan | 論文
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