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<p>In hot stamping, strain distribution across components varies, influencing phase transformation and mechanical properties. This study examines these effects in a hot stamping grade steel using a Gleeble<sup>TM</sup> thermal–mechanical simulator. Steel strips were strained (0.03, 0.06, 0.09) at 1173&#xa0;K and quenched at 70&#xa0;K&#xa0;s<sup>−1</sup>. Results indicate that strain lowers the martensite start (<i>M</i><sub>s</sub>) temperature; this is however unaffected by the magnitude of strain. The martensite finish (<i>M</i><sub>f</sub>) temperature is found to decrease with increasing strain, indicating sluggishness in transformation kinetics. EBSD studies indicate that this sluggishness is due to the selective growth of martensite variants with higher misorientation angles. Mechanical testing reveals that ultimate tensile strength remains stable up to 0.06 strain but decline at 0.09 strain due to variant selection and increased lath size. These findings highlight the critical role of strain in controlling transformation behaviour and mechanical performance during hot stamping.</p>

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Influence of Strain on the Transformation Behaviour and Mechanical Properties of a Stamping Grade Steel

  • 期刊论文

  • 发表日期：

    2026年5月28日

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  • Melwin Sajan,
  • Murugaiyan Amirthalingam,
  • Uday Chakkingal

摘要

In hot stamping, strain distribution across components varies, influencing phase transformation and mechanical properties. This study examines these effects in a hot stamping grade steel using a GleebleTM thermal–mechanical simulator. Steel strips were strained (0.03, 0.06, 0.09) at 1173 K and quenched at 70 K s−1. Results indicate that strain lowers the martensite start (Ms) temperature; this is however unaffected by the magnitude of strain. The martensite finish (Mf) temperature is found to decrease with increasing strain, indicating sluggishness in transformation kinetics. EBSD studies indicate that this sluggishness is due to the selective growth of martensite variants with higher misorientation angles. Mechanical testing reveals that ultimate tensile strength remains stable up to 0.06 strain but decline at 0.09 strain due to variant selection and increased lath size. These findings highlight the critical role of strain in controlling transformation behaviour and mechanical performance during hot stamping.