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<p>Martensite formation requires knowledge of the critical transformation temperatures and the kinetics of austenite formation. Both depend on the chemical composition, microstructure, and heating rate. In this work, the dilatometric behavior of two medium -carbon steels, (1) AISI 4140 and (2) AISI 4140 modified with Si, Mo, and V, was analyzed. Continuous heating was carried out at different heating rates (from 0.16 to 0.66&#xa0;°C&#xa0;s<sup>−1</sup>). The austenite formation occurs in a single stage, being more extensive in the modified AISI 4140 steel. Besides, the transformation kinetics in this steel is delayed principally by silicon displaced the critical temperatures at higher temperatures. It was shown that the transformation rate is higher in the AISI 4140 steel than in the modified AISI 4140 due to the low solubility of silicon in austenite. Using this information, a processing route can be defined to create a specific microstructure, leading to desired mechanical properties and behavior.</p> Graphical abstract <p></p>

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Dilatometric analysis of an experimental medium -carbon steel alloyed with Si-Mo-V

  • 期刊论文

  • 发表日期：

    2024年12月31日

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  • R. Guzman-Garfias,
  • O. Vázquez-Gómez,
  • H. J. Vergara-Hernández,
  • P. Garnica-González,
  • E. López-Martínez

摘要

Martensite formation requires knowledge of the critical transformation temperatures and the kinetics of austenite formation. Both depend on the chemical composition, microstructure, and heating rate. In this work, the dilatometric behavior of two medium -carbon steels, (1) AISI 4140 and (2) AISI 4140 modified with Si, Mo, and V, was analyzed. Continuous heating was carried out at different heating rates (from 0.16 to 0.66 °C s−1). The austenite formation occurs in a single stage, being more extensive in the modified AISI 4140 steel. Besides, the transformation kinetics in this steel is delayed principally by silicon displaced the critical temperatures at higher temperatures. It was shown that the transformation rate is higher in the AISI 4140 steel than in the modified AISI 4140 due to the low solubility of silicon in austenite. Using this information, a processing route can be defined to create a specific microstructure, leading to desired mechanical properties and behavior.

Graphical abstract