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<p>The Fe–Mn damping alloys possess considerable damping capacity, but their yield strength is rather low. The 800&#xa0;MPa Fe–Mn alloy with expected damping capacity was designed by the combination of grain refinement and ε-martensite introduction. The yield strength can be greatly raised to around 700&#xa0;MPa by refining grain size from 88.4 to 1.8&#xa0;μm. Although there exist numerous stacking faults in the fine-grained alloy, the damping capacity is strongly deteriorated due to the suppression of thermally activated ε-martensite. We demonstrate that the stacking faults cannot provide effective contribution to damping capacity and hence introduce a considerable volume fraction of stress/strain-induced ε-martensite to raise damping sources, including ε-martensite and γ/ε interfaces, etc., by a small pre-strain. From this, the damping capacity can be improved, and the yield strength can be further enhanced from nearly 700&#xa0;MPa to around 800&#xa0;MPa. Thus, the combination of high yield strength and good damping capacity is realized.</p>

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800 MPa Fe–Mn alloy with expected damping capacity by coupling grain refinement and ε-martensite introduction

  • 期刊论文

  • 发表日期：

    2025年1月6日

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  • Xiao-guang Xie,
  • Jun Chen,
  • Guang-ming Cao

摘要

The Fe–Mn damping alloys possess considerable damping capacity, but their yield strength is rather low. The 800 MPa Fe–Mn alloy with expected damping capacity was designed by the combination of grain refinement and ε-martensite introduction. The yield strength can be greatly raised to around 700 MPa by refining grain size from 88.4 to 1.8 μm. Although there exist numerous stacking faults in the fine-grained alloy, the damping capacity is strongly deteriorated due to the suppression of thermally activated ε-martensite. We demonstrate that the stacking faults cannot provide effective contribution to damping capacity and hence introduce a considerable volume fraction of stress/strain-induced ε-martensite to raise damping sources, including ε-martensite and γ/ε interfaces, etc., by a small pre-strain. From this, the damping capacity can be improved, and the yield strength can be further enhanced from nearly 700 MPa to around 800 MPa. Thus, the combination of high yield strength and good damping capacity is realized.