Scholarlink

<p>This study investigates the quenching-induced residual stress (RS) in Mg-Gd-Y-Zr-Ag alloy conical components generated during manufacturing. To mitigate the detrimental effects of high RS levels, a dual approach combining finite element simulations and experimental validation was employed to optimize heat treatment parameters. The research further systematically examines the interdependencies between RS reduction, microstructural evolution, and mechanical property changes, including hardness and tensile characteristics. The results show that: the RS reduction rate of the cone by 200-250&#xa0;°C heat treatment was 30.98-64.95%, which was almost linear with temperature. The investigated heat treatment methods exhibited negligible influence on grain size evolution. However, peak aging at 250&#xa0;°C induced significant coarsening and coalescence of <i>β</i> and <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({{\varvec{\upbeta}}}^{\mathbf{^{\prime}}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow> <mrow> <mi mathvariant="bold">β</mi> </mrow> </mrow> <mrow /> <mmultiscripts> <mrow /> <mrow /> <mo>′</mo> </mmultiscripts> </mmultiscripts> </math></EquationSource> </InlineEquation> phase precipitates along grain boundaries. This microstructural reorganization substantially diminished the grain-boundary pinning effect. Consequently, the Mg-Gd-Y-Zr-Ag alloy displayed markedly reduced hardness and tensile strength at 250&#xa0;°C compared to treatments at 200&#xa0;°C and 225&#xa0;°C. These findings suggest that prolonged exposure to 250&#xa0;°C should be avoided. Therefore, the RS was reduced by 225&#xa0;°C/24h + 250&#xa0;°C/0.5&#xa0;h two-stage aging heat treatment, and the reduction rate was about 40-50%.</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

Study of Influence of Heat Treatment on the Quenching Residual Stress, Hardness, Tensile Properties, and Microstructure of Mg-Gd-Y-Zr-Ag Alloy Conical Parts

  • 期刊论文

  • 发表日期：

    2025年5月7日

查看全文
  • Qiumin Xie,
  • Yunxin Wu,
  • Yuanzhi Wu

摘要

This study investigates the quenching-induced residual stress (RS) in Mg-Gd-Y-Zr-Ag alloy conical components generated during manufacturing. To mitigate the detrimental effects of high RS levels, a dual approach combining finite element simulations and experimental validation was employed to optimize heat treatment parameters. The research further systematically examines the interdependencies between RS reduction, microstructural evolution, and mechanical property changes, including hardness and tensile characteristics. The results show that: the RS reduction rate of the cone by 200-250 °C heat treatment was 30.98-64.95%, which was almost linear with temperature. The investigated heat treatment methods exhibited negligible influence on grain size evolution. However, peak aging at 250 °C induced significant coarsening and coalescence of β and \({{\varvec{\upbeta}}}^{\mathbf{^{\prime}}}\) β ′ phase precipitates along grain boundaries. This microstructural reorganization substantially diminished the grain-boundary pinning effect. Consequently, the Mg-Gd-Y-Zr-Ag alloy displayed markedly reduced hardness and tensile strength at 250 °C compared to treatments at 200 °C and 225 °C. These findings suggest that prolonged exposure to 250 °C should be avoided. Therefore, the RS was reduced by 225 °C/24h + 250 °C/0.5 h two-stage aging heat treatment, and the reduction rate was about 40-50%.