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<p>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.</p> Graphical abstract <p></p>

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

  • 期刊论文

  • 发表日期：

    2025年2月3日

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

摘要

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 abstract