Crack propagation kinetics under asymmetric cyclic loading for 316LN SS in high-temperature solution

Panpan Wu; Tongming Cui; Junjie Chen; Zhanpeng Lu; Tetsuo Shoji

Journal of Materials Research and Technology (Sep 2024)

Crack propagation kinetics under asymmetric cyclic loading for 316LN SS in high-temperature solution

Panpan Wu,
Tongming Cui,
Junjie Chen,
Zhanpeng Lu,
Tetsuo Shoji

Affiliations

Panpan Wu: Institute of Materials, School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, China; State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai, 200072, China
Tongming Cui: Institute of Materials, School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, China; State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai, 200072, China
Junjie Chen: Institute of Materials, School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, China; State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai, 200072, China
Zhanpeng Lu: Institute of Materials, School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, China; State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai, 200072, China; Corresponding author. Institute of Materials, School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, China.
Tetsuo Shoji: New Industry Creation Hatchery Center, Tohoku University, Sendai, 980-8579, Japan

Journal volume & issue: Vol. 32
pp. 2115 – 2126

Abstract

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Crack propagation rates (CPRs, or da/dN) of 316LN stainless steel (SS) in high-temperature solution under asymmetric cyclic loading conditions are experimentally determined, focusing primarily on the effect of load-rise time on crack propagation. The increment in crack propagation per cyclic block mainly occurs during the load-rise period. When the stress intensity factor range (ΔK) and load ratio (R) are kept similar, a faster increase in the stress intensity factor (dK/dt) during the load-rise period results in a lower average crack propagation rate (Vave-tr) during that phase. Secondary cracks and fatigue striations are observed on the fracture surface. The CPRs show a higher environmental enhancement factor (Fen) as the load-rise time increases.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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