835 鋳造オーステナイト系ステンレス鋼の高温低サイクル疲労

概要

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SUS304 stainless steel and cast austenitic stainless steel, of which matrix has the similar chemical compositions to those in SUS304 steel, were low-cycle fatigued under axial and diametral strain-controlled conditions at the test temperature 550℃. The relationships between inelastic strain amplitude △ε _<ins>/2 and fatigue life Nf, and stress amplitude △σ _s/2 and Nf showed that fatigue life is much shorter in cast stainless steel than in SUS304 steel. It was suggested from micro-structure observations that this is caused by the characteristic growth of fatigue crack initiated at inclusions and cast defects included in the cast stainless steel. Moreover, the much smaller strength was shown in the cast stainless steel than in SUS304 steel in cyclic stress-strain response determined from the test.
2000-07-31