Effect of Nitrogen on Creep-Fatigue Interaction in Austenitic Stainless Steels at 600°C

J-O Nilsson

doi:10.1520/STP24505S

SYMPOSIA PAPER Published: 01 January 1988

STP24505S

Effect of Nitrogen on Creep-Fatigue Interaction in Austenitic Stainless Steels at 600°C

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Three austenitic stainless steels (AISI 316, AISI 316LN, and 253MA) have been investigated at 600°C with respect to fatigue and creep-fatigue behavior. Transmission electron microscopy showed that cross-slip and climb of dislocations are inhibited in AISI 316LN and 253MA due to the presence of nitrogen in solid solution. This results in a planar slip character and a concomitant increase in fatigue strength. However, during creep-fatigue deformation, nitrogen has an adverse effect on strength. This can be explained as an enhanced interaction between creep and fatigue due to the generation of high stresses in the grain boundary regions, caused by inhibited recovery.

Author Information

Nilsson, J-O

Research & Development Centre, Mechanical Metallography, AB Sandvik Steel, Sandviken, Sweden

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Developed by Committee: E08

Pages: 543–557

DOI: 10.1520/STP24505S

ISBN-EB: 978-0-8031-5035-5

ISBN-13: 978-0-8031-0944-5

Effect of Nitrogen on Creep-Fatigue Interaction in Austenitic Stainless Steels at 600°C

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