Scholarlink

<p>The high-temperature dissolution behavior of carbides during the quenching process significantly influences grain growth, mechanical properties, and secondary carbide precipitation, thereby playing a major role in the heat treatment process of die steel. This study investigated the changes in carbide type, particle size distribution, and weight percentage in DC53 steel after holding at 1060&#xa0;°C for 2&#xa0;h, followed by oil quenching. The analysis was conducted using Thermo-Calc, DICTRA computations, and experimental methods including electron backscatter diffraction, transmission electron microscopy and laser particle size analysis. The experimental results showed that four types of carbides (M<sub>7</sub>C<sub>3</sub>, M<sub>6</sub>C, M<sub>23</sub>C<sub>6</sub>, and MC) existed in DC53 steel before quenching. After quenching, M<sub>23</sub>C<sub>6</sub> carbides were almost entirely dissolved, while the other three types partially dissolved into the matrix. The volume-weighted geometric mean size of carbides (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\overline{x}\)</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mi>x</mi> <mo>¯</mo> </mover> </math></EquationSource> </InlineEquation> <sub>geo,3</sub>) increased from 5.43 to 15.15&#xa0;μm, and the weight percentage decreased from 13.03% to 5.01%. Small-sized carbides (below 5&#xa0;μm) dissolved more readily, which primarily accounted for the reduction in carbide weight percentage during quenching. In contrast, the weight percentage of large-sized carbides (greater than 10&#xa0;μm) varies less. DICTRA computations indicated that M<sub>7</sub>C<sub>3</sub> carbides smaller than 7&#xa0;μm can completely dissolve into the matrix after holding at 1060&#xa0;°C for 2&#xa0;h. The findings provide an effective reference for optimizing carbide control during the heat treatment process of DC53 steel.</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

High-temperature dissolution behavior of carbides in DC53 steel during quenching process

  • 期刊论文

  • 发表日期：

    2026年2月10日

查看全文
  • Chong-Sheng Ma,
  • Yu-Long Cao,
  • Zhong-Xin Zhang,
  • Guang-Qiang Li,
  • Zheng-Rong Zhao,
  • Pei-Qi Zhou

摘要

The high-temperature dissolution behavior of carbides during the quenching process significantly influences grain growth, mechanical properties, and secondary carbide precipitation, thereby playing a major role in the heat treatment process of die steel. This study investigated the changes in carbide type, particle size distribution, and weight percentage in DC53 steel after holding at 1060 °C for 2 h, followed by oil quenching. The analysis was conducted using Thermo-Calc, DICTRA computations, and experimental methods including electron backscatter diffraction, transmission electron microscopy and laser particle size analysis. The experimental results showed that four types of carbides (M7C3, M6C, M23C6, and MC) existed in DC53 steel before quenching. After quenching, M23C6 carbides were almost entirely dissolved, while the other three types partially dissolved into the matrix. The volume-weighted geometric mean size of carbides ( \(\overline{x}\) x ¯ geo,3) increased from 5.43 to 15.15 μm, and the weight percentage decreased from 13.03% to 5.01%. Small-sized carbides (below 5 μm) dissolved more readily, which primarily accounted for the reduction in carbide weight percentage during quenching. In contrast, the weight percentage of large-sized carbides (greater than 10 μm) varies less. DICTRA computations indicated that M7C3 carbides smaller than 7 μm can completely dissolve into the matrix after holding at 1060 °C for 2 h. The findings provide an effective reference for optimizing carbide control during the heat treatment process of DC53 steel.