Journal of the Society of Materials Science, Japan
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
Original Papers
Effects of Pre-Working and Dynamic Strain Aging on High Cycle Fatigue Fracture of a Stainless Steel SUS316NG at 300°C
Yukio TAKAHASHIKenji KANAZAWAMaya SUGIMOTORiho MURAIHiroaki OKADA
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2011 Volume 60 Issue 8 Pages 728-734

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Abstract
In order to obtain information about relationships between fatigue strength of a SUS316NG austenitic stainless steel and hardening behavior due to dynamic strain aging during fatigue tests, rotating bending fatigue tests were carried out at 300°C for notched specimens for stress concentration factors being less than 2.0 and for burnished hourglass type specimens. As for the notched specimens, fatigue fracture occurred before the specimens hardened enough during fatigue tests and the fatigue strengths did not reach the expected values from fatigue strengths of notched specimens for stress concentration factor being greater than 2.0. As for the burnished specimens, the specimen surfaces hardened enough previously to fatigue test but the fatigue strength also did not reach the expected value. Internal fracture occurred for burnished specimens and fish-eye patterns were observed on the fracture surfaces.
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© 2011 by The Society of Materials Science, Japan
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