journal article·2025-03-14

Assessment of stability of retained austenite during instrumented indentation of martempered SAE 9254 spring steel

Mohsin Hasan, Harita Seekala, P. Sudharshan Phani, S. Janakiram, K. Nanda Kishore, Robert Brandt, Manjini Sambandam, Koteswararao V. Rajulapati

Journal of Materials Research· Volume 40· Issue 5
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Abstract

This study examines the relationship between local microstructure and mechanical properties in martempered spring steel with lower level of austenite stabilizers, in contrast to advanced high-strength steels. Electron Back-Scattered Diffraction (EBSD) mapping before and after indentation, coupled with depth-dependent nanoindentation, was used to investigate austenite transformation and local mechanical property variations. Regions with unique microstructural features and mechanical properties were identified, including untransformed and transformed retained austenite, coarse and fine martensite, and austenite adjacent to martensite grains. Fine martensite exhibited the highest hardness, while untransformed retained austenite showed the lowest. The stability of retained austenite was found to be influenced by neighboring phases, with grains near fine martensite showing greater stability. A key contribution of this work is the measurement of hardness of individual blocky austenite grains without influence from adjacent phases, providing critical insights on the mechanical stability of retained austenite in steels with low austenite stabilizers.Graphical abstractInsights on phase transformations at small length scales in martempered steel
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Research context

OpenAlex topics: Metal and Thin Film Mechanics · Metal Alloys Wear and Properties · Microstructure and Mechanical Properties of Steels

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

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