Microstructure Evolution during LCF of a 10%Cr Steel at Room Temperature

Roman Mishnev; Nadezhda Dudova; Rustam Kaibyshev

doi:10.4028/www.scientific.net/MSF.879.1311

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HomeMaterials Science ForumMaterials Science Forum Vol. 879Microstructure Evolution during LCF of a 10%Cr...

Microstructure Evolution during LCF of a 10%Cr Steel at Room Temperature

Abstract:

The influence of cyclic loading on microstructure and hardness of a 10%Cr steel with 3%Co and 0.008%B was examined at room temperature and total strain amplitudes of ±0.25% and ±0.6%. Low cycle fatigue (LCF) curves exhibit a stress peak after a few cycles. Hardening is attributed to an increase in dislocation density; no changes in lath size were observed. Then stress tends to decrease monotonically with number of cycles that is indicative for material softening. At ε_ac =±0.25%, strain softening is attributed to decreasing dislocation density and lath coarsening under LCF, whereas at ε_ac =±0.6%, the knitting reaction between dislocations comprising lath boundaries and trapped lattice dislocation leading to the transformation of lath boundaries to subboundaries is a reason for hardness decrease and strain-induced subgrain coarsening.

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Materials Science Forum (Volume 879)

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1311-1316

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https://doi.org/10.4028/www.scientific.net/MSF.879.1311

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November 2016

Authors:

Roman Mishnev*, Nadezhda Dudova, Rustam Kaibyshev

Keywords:

Cyclic Softening, Low Cycle Fatigue, Martensite, Microstructure

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