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01-11-2014 | Issue 11/2014

Journal of Materials Engineering and Performance 11/2014

Ratcheting Behavior of a Non-conventional Stainless Steel and Associated Microstructural Variations

Journal:
Journal of Materials Engineering and Performance > Issue 11/2014
Authors:
Lopamudra Sahu, Awanish Kumar Mishra, Krishna Dutta

Abstract

Ratcheting fatigue behavior of a non-conventional stainless steel X12CrMnNiN17-7-5 has been investigated with varying combinations of mean stress (σm) and stress amplitude (σa) at room temperature using a servo-hydraulic universal testing machine. X-ray diffraction profile analysis has been carried out for assessing possible martensitic phase transformation in the steel subjected to ratcheting deformation. The results indicate that ratcheting strain as well as volume fraction of martensite increases with increasing σm and/or σa; the phenomenon of strain accumulation is considered to be governed by the associated mechanics of cyclic loading, increased plastic damage as well as martensitic transformation. A correlation between strain produced by ratcheting deformation and martensitic transformation has been established.

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