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Surface martensite transformation in steel via surface mechanical attrition treatment (SMAT) is reported. Mechanically induced phase transformations along with grain refinement took place on the steel surface bombarded with high energy steel balls till 40 min. Based on SEM and XRD analysis, martensite and ferrite phases were detected. A significant increase in transformation was observed with treatment time according to SEM and XRD analysis. After 40 min of SMAT, martensite and ferrite reach a maximum of 86% and 14%, respectively. The modification of the surface microstructure brought about significant changes in the mechanical properties of steel. The surface hardness of the steel has increased to 250 VH from 120 VH and the yield strength has risen to 400 MPa from 260 MPa. This study illustrates how SMAT represents a novel method for modifying the microstructure and mechanical characteristics of steel via stress-induced phase transformation occurring at room temperature.

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Modification of a Steel Surface via Surface Mechanical Attrition Treatment and Its Effect on Mechanical Properties

  • 会议论文

  • 发表日期：

    2025年

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  • Lokendra Kumar Katiyar,
  • C. Sasikumar

摘要

Surface martensite transformation in steel via surface mechanical attrition treatment (SMAT) is reported. Mechanically induced phase transformations along with grain refinement took place on the steel surface bombarded with high energy steel balls till 40 min. Based on SEM and XRD analysis, martensite and ferrite phases were detected. A significant increase in transformation was observed with treatment time according to SEM and XRD analysis. After 40 min of SMAT, martensite and ferrite reach a maximum of 86% and 14%, respectively. The modification of the surface microstructure brought about significant changes in the mechanical properties of steel. The surface hardness of the steel has increased to 250 VH from 120 VH and the yield strength has risen to 400 MPa from 260 MPa. This study illustrates how SMAT represents a novel method for modifying the microstructure and mechanical characteristics of steel via stress-induced phase transformation occurring at room temperature.