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<p>Pre-deformation is a simple and effective method to improve the strength and damping capacity of Fe–Mn damping alloys. Unfortunately, there is still a lack of in-depth understanding of the multiple martensitic transformations and strengthening mechanisms after pre-deformation, especially the exact correspondence between pre-deformation parameters and damping capacity, as well as the damping mechanisms. In this study, Fe−17.2Mn−0.05C−0.45Si−0.36Cr−0.05V alloy after annealing was used as the experimental material. Various microstructural characterization techniques, tensile and damping testing methods were used to reveal the effects of 2 to 8 pct cold rolling pre-deformation on the microstructure, mechanical properties, and damping capacity, attempting to clarify the strengthening and damping mechanisms after cold rolling pre-deformation. The results show that the strength and damping capacity of this alloy are significantly improved after pre-deformation. Dislocation multiplication, deformation-induced stacking faults and <i>γ</i> → <i>ε</i> transformation mainly occur, resulting in the increase of dislocation, stacking faults, and <i>ε</i>-martensite. Additionally, a small amount of<i> α</i>′-martensite is induced due to the <i>ε</i> → <i>α</i>′ transformation. The increment of strength is mainly attributed to dislocation strengthening, grain boundary strengthening, and hardened <i>α</i>′-martensite structure. After appropriate pre-deformation, the multiple martensitic transformations are promoted during tensile deformation, which ensure that the elongation does not significantly decrease. Quantitatively, at cold rolling pre-deformation ratio of 4 pct, this alloy exhibits the best combination of strength and plasticity, with a tensile strength of 1010 ± 8&#xa0;MPa, a yield strength of 627 ± 9&#xa0;MPa, and an elongation of 38.8 ± 0.5 pct. The enhanced damping capacity is mainly due to the increase in damping sources, especially the <i> γ</i>/<i>ε</i> and<i> ε</i>/<i>ε</i> interfaces, while it is closely related to the applied strain amplitude and cold rolling pre-deformation ratio. After 2, 4, and 8 pct pre-deformation, the damping capacities at strain amplitudes of 0.01 and 0.08 pct are increased by 7.6, 16.5, 13.2, and 11.8, 18.1, 22.6 pct, respectively.</p>

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Significant Improvement of Mechanical Properties and Damping Capacity via Cold Rolling Pre-deformation in Fe−17Mn Damping Alloy

  • 期刊论文

  • 发表日期：

    2025年9月23日

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  • Shuai Wang,
  • Yang Feng,
  • Junjun Cui,
  • Yang Zhao,
  • Liqing Chen

摘要

Pre-deformation is a simple and effective method to improve the strength and damping capacity of Fe–Mn damping alloys. Unfortunately, there is still a lack of in-depth understanding of the multiple martensitic transformations and strengthening mechanisms after pre-deformation, especially the exact correspondence between pre-deformation parameters and damping capacity, as well as the damping mechanisms. In this study, Fe−17.2Mn−0.05C−0.45Si−0.36Cr−0.05V alloy after annealing was used as the experimental material. Various microstructural characterization techniques, tensile and damping testing methods were used to reveal the effects of 2 to 8 pct cold rolling pre-deformation on the microstructure, mechanical properties, and damping capacity, attempting to clarify the strengthening and damping mechanisms after cold rolling pre-deformation. The results show that the strength and damping capacity of this alloy are significantly improved after pre-deformation. Dislocation multiplication, deformation-induced stacking faults and γ → ε transformation mainly occur, resulting in the increase of dislocation, stacking faults, and ε-martensite. Additionally, a small amount of α′-martensite is induced due to the ε → α′ transformation. The increment of strength is mainly attributed to dislocation strengthening, grain boundary strengthening, and hardened α′-martensite structure. After appropriate pre-deformation, the multiple martensitic transformations are promoted during tensile deformation, which ensure that the elongation does not significantly decrease. Quantitatively, at cold rolling pre-deformation ratio of 4 pct, this alloy exhibits the best combination of strength and plasticity, with a tensile strength of 1010 ± 8 MPa, a yield strength of 627 ± 9 MPa, and an elongation of 38.8 ± 0.5 pct. The enhanced damping capacity is mainly due to the increase in damping sources, especially the γ/ε and ε/ε interfaces, while it is closely related to the applied strain amplitude and cold rolling pre-deformation ratio. After 2, 4, and 8 pct pre-deformation, the damping capacities at strain amplitudes of 0.01 and 0.08 pct are increased by 7.6, 16.5, 13.2, and 11.8, 18.1, 22.6 pct, respectively.