ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Low Cycle Fatigue Behavior of a 10% Cr Martensitic Steel at 600°C
Roman MishnevNadezhda Dudova Rustam Kaibyshev
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2015 Volume 55 Issue 11 Pages 2469-2476

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Abstract

In this work, the low cycle fatigue (LCF) behavior of a 10% Cr martensitic steel was studied under fully reversed tension-compression loading at 600°C for constant strain amplitudes between ±0.20 to ±1.0%. The cyclic stress response exhibited a gradual softening regime until fracture after an initial short period of a nearly stable stress. The fatigue lifetime curve at 600°C was determined to be described by the Basquin-Manson-Coffin relationship. At constant strain amplitudes of ≥±0.35%, the cyclic strain resistance of the steel mostly depends on its plastic properties. The cyclic softening effect was attributed to the coarsening of the laths and subgrains, accompanied by a decrease in the dislocation density.

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© 2015 by The Iron and Steel Institute of Japan
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