Strain and Martensitic Phase Distributions around Fatigue Cracks in SUS304 Stainless Steel

Yuji Nakasone; Yoshifumi Iwasaki

doi:10.4028/www.scientific.net/AMR.33-37.237

Paper Titles

Effect of Load Direction on Crack Propagation in High-Temperature Fatigue of Directionally Solidified Superalloy
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Fatigue Analysis of Locking Parts in the Gauge-Adjustable Wheelsets System Considering the Variation of the Fatigue Strength
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Probabilistic Analysis of Cracked Structures With Uncertainty Parameters
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Fatigue Behaviors of a NiCrAlYSi Coated Directionally Solidified Nickel Base Superalloy
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Strain and Martensitic Phase Distributions around Fatigue Cracks in SUS304 Stainless Steel
p.237

Study of Fretting Fatigue Crack Initiation For Riveted Al 6xxx Components
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Optimization of Integrally Stiffened Panels Based on Crack Propagation Life
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Fatigue Life of Thread Connection for Casing Drilling under Tension and Torsion
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Experimental Study on Fatigue Crack Growth and Residual Strength of Steel 30CrMnSiNi2A under Mixed Corrosive Environments
p.261

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Strain and Martensitic Phase Distributions around Fatigue Cracks in SUS304 Stainless Steel

Abstract:

The present study investigates the relations between distributions of strain with those of martensitic volume fraction around fatigue cracks in SUS304 stainless steel. Specimens having random pattern created by spraying on their surfaces were fatigued at room temperature (297K) in air. The pictures around fatigue crack were taken during fatigue crack propagation experiments. Distributions of strain were calculated by the digital image correlation (DIC) method with these pictures. Distributions of martensitic volume fraction Vα’ were measured around fatigue cracks with ferrite scope. The distributions of strain resembled those of Vα’. The higher the strain becomes, the more the α’ martensitic phase was induced by the plasticity-induced transformation around fatigue cracks. It was revealed that the same value of Vα’max is induced by strain regardless of static or fatigue.