Scholarlink

<p>The effect of austenitization temperature (<i>T</i><sub><i>A</i></sub>) and cooling rate (<i>CR</i>) on microstructure and transformation kinetics of near eutectoid steel after continuous cooling transformation have been studied by dilatometry. The samples were austenitized at 800, 900, and 1000&#xa0;°C for 20&#xa0;min, and then cooled to room temperature at <i>CR</i> of 0.5, 1, and 2&#xa0;°C/s. Increasing <i>CR</i> resulted in the lowering of interlamellar spacing (<i>S</i>), producing finer pearlite. Similarly, at a constant <i>CR</i>, <i>S</i> decreased with higher <i>T</i><sub><i>A</i></sub>. The nature of pearlite nucleation indicating site saturation was predicted through kinetic analysis, where the Kamamoto equation was applied to the dilatometric data of the fully pearlitic steels. The DICTRA simulations using the MobFe2 database confirmed the increased time for completion of transformation and decreased <i>S</i> with increased <i>T</i><sub><i>A</i></sub> at a <i>CR</i> of 2&#xa0;°C/s, aligning well with the experimental data. Both experimental and simulated results also showed consistent trends in time for completion of transformation and <i>S</i> values across constant <i>T</i><sub><i>A</i></sub> of 1000&#xa0;°C with varying <i>CR</i> conditions.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of Austenitization and Cooling Rate on Pearlite Morphology and Kinetics of Near Eutectoid Steel: A Combined Experimental–Simulation Approach

  • 期刊论文

  • 发表日期：

    2025年8月9日

查看全文
  • Ipsa Tripathy,
  • Manila Mallik,
  • Shiv Brat Singh

摘要

The effect of austenitization temperature (TA) and cooling rate (CR) on microstructure and transformation kinetics of near eutectoid steel after continuous cooling transformation have been studied by dilatometry. The samples were austenitized at 800, 900, and 1000 °C for 20 min, and then cooled to room temperature at CR of 0.5, 1, and 2 °C/s. Increasing CR resulted in the lowering of interlamellar spacing (S), producing finer pearlite. Similarly, at a constant CR, S decreased with higher TA. The nature of pearlite nucleation indicating site saturation was predicted through kinetic analysis, where the Kamamoto equation was applied to the dilatometric data of the fully pearlitic steels. The DICTRA simulations using the MobFe2 database confirmed the increased time for completion of transformation and decreased S with increased TA at a CR of 2 °C/s, aligning well with the experimental data. Both experimental and simulated results also showed consistent trends in time for completion of transformation and S values across constant TA of 1000 °C with varying CR conditions.