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<p>This study investigated the quenching-induced residual stress (RS) in the large cuboid Mg-Gd-Y-Zr-Ag alloy forging generated during manufacturing. To mitigate the detrimental effects of high RS levels, cold pressing (CP) was employed under various compression ratios. The research further systematically examined the interdependencies between RS reduction, hardness change and microstructural evolution. The results show that the RS transitioned sharply within 100 ~ 200&#xa0;mm from the edge of the forging, while the directional RS was ranged from − 40 to − 65&#xa0;MPa at the stress platform in the central region. It was optimal to apply a CP ratio of 1% to reduce RS, and the reduction ratio of RS on the surface layer was 77.30 ~ 97.33%. Reducing the RS by CP had barely an effect on the grain size of the forging, only the <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\beta^{\prime }\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mi>β</mi> <mo>′</mo> </msup> </math></EquationSource> </InlineEquation> precipitated phase during aging changed from dense and uniform distribution to uniform chain distribution, thus slightly increasing the hardness after aging.</p>

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Study of Influence of Cold Pressing on the Quenching Residual Stress, Hardness and Microstructure of the Large Cuboid Mg-Gd-Y-Zr-Ag Alloy Forging

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Qiumin Xie,
  • Yuanzhi Wu,
  • Yunxin Wu

摘要

This study investigated the quenching-induced residual stress (RS) in the large cuboid Mg-Gd-Y-Zr-Ag alloy forging generated during manufacturing. To mitigate the detrimental effects of high RS levels, cold pressing (CP) was employed under various compression ratios. The research further systematically examined the interdependencies between RS reduction, hardness change and microstructural evolution. The results show that the RS transitioned sharply within 100 ~ 200 mm from the edge of the forging, while the directional RS was ranged from − 40 to − 65 MPa at the stress platform in the central region. It was optimal to apply a CP ratio of 1% to reduce RS, and the reduction ratio of RS on the surface layer was 77.30 ~ 97.33%. Reducing the RS by CP had barely an effect on the grain size of the forging, only the \(\beta^{\prime }\) β ′ precipitated phase during aging changed from dense and uniform distribution to uniform chain distribution, thus slightly increasing the hardness after aging.