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<p>The effect of preheating on the strain-induced <i>α</i>′-martensite transformation in cold-rolled (CR) AISI 316Ti austenitic stainless steel was experimentally investigated. A 3-h heat pretreatment at 1100&#xa0;°C was conducted, leading to increased average austenitic grain size. The steel was then cold-rolled with thickness reductions of 20, 37, 56, and 88%. The microstructure was characterized using optical microscopy, scanning electron microscopy, and x-ray diffraction. The mechanical properties of AISI 316Ti were assessed using nanoindentation tests and magnetic measurements. Cold rolling without prior heating resulted in the progressive formation of strain-induced <i>α′</i>-martensite as the cold rolling ratio increased. However, after preheating, no strain-induced martensite was observed following cold rolling. These results provide valuable insights into the relationship between heat treatment, cold rolling parameters, microstructural changes, and the evolution of mechanical properties in AISI 316Ti austenitic stainless steel.</p>

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Effect of Preheat Treatment on Strain-Induced Martensite Transformation in AISI 316Ti Austenitic Stainless Steel

  • 期刊论文

  • 发表日期：

    2025年4月10日

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  • Houria Kaddour,
  • Leila Belgacem,
  • Mounir Sakmeche

摘要

The effect of preheating on the strain-induced α′-martensite transformation in cold-rolled (CR) AISI 316Ti austenitic stainless steel was experimentally investigated. A 3-h heat pretreatment at 1100 °C was conducted, leading to increased average austenitic grain size. The steel was then cold-rolled with thickness reductions of 20, 37, 56, and 88%. The microstructure was characterized using optical microscopy, scanning electron microscopy, and x-ray diffraction. The mechanical properties of AISI 316Ti were assessed using nanoindentation tests and magnetic measurements. Cold rolling without prior heating resulted in the progressive formation of strain-induced α′-martensite as the cold rolling ratio increased. However, after preheating, no strain-induced martensite was observed following cold rolling. These results provide valuable insights into the relationship between heat treatment, cold rolling parameters, microstructural changes, and the evolution of mechanical properties in AISI 316Ti austenitic stainless steel.