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<p>In this study, the changes in precipitation behavior and mechanical properties of Fe−17Mn-0.88C high-manganese steel under different aging times are studied using SEM, EPMA, and TEM, combined with complementary micromechanical characterization techniques such as nanoindentation. There is no significant change in micron-sized precipitates, but the amount of nano-sized V<sub>2</sub>C precipitates increases obviously and the distribution is more uniform as the aging time (AT) increases. The improvement of mechanical properties of the tested steel can be ascribed to precipitation strengthening. The variation of yield strength (from 484 to 548&#xa0;MPa) with AT (from 1 to 24&#xa0;h) is mainly attributed to the increase of volume fraction and homogeneous distribution of the nano-sized V<sub>2</sub>C precipitates. The optimum AT is considered as 24&#xa0;h, it obtains the maximum hardness (250 HWB) and better impact toughness (81&#xa0;J). Moreover, the yield strength increment caused by precipitation strengthening and peak work-hardening rate of AT24 steel are up to 27.8&#xa0;MPa and 65 GPa, respectively. The entire mechanical properties are characterized by NanoBlitz three-dimensional (3D) maps, and the values of nano-hardness and Young's modulus of AT24 steel are greater than 16.86 GPa and 370 GPa.</p>

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Precipitation Behavior and Mechanical Properties of High-Manganese Steel During Aging

  • 期刊论文

  • 发表日期：

    2025年12月29日

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  • Zhihai Wu,
  • Hao Fu,
  • Xiedong Huang,
  • Ru Ge,
  • Tongtao Wei,
  • Jihua Li,
  • Youxiao Cai,
  • Xinyu Shen,
  • Zulai Li,
  • Quan Shan

摘要

In this study, the changes in precipitation behavior and mechanical properties of Fe−17Mn-0.88C high-manganese steel under different aging times are studied using SEM, EPMA, and TEM, combined with complementary micromechanical characterization techniques such as nanoindentation. There is no significant change in micron-sized precipitates, but the amount of nano-sized V2C precipitates increases obviously and the distribution is more uniform as the aging time (AT) increases. The improvement of mechanical properties of the tested steel can be ascribed to precipitation strengthening. The variation of yield strength (from 484 to 548 MPa) with AT (from 1 to 24 h) is mainly attributed to the increase of volume fraction and homogeneous distribution of the nano-sized V2C precipitates. The optimum AT is considered as 24 h, it obtains the maximum hardness (250 HWB) and better impact toughness (81 J). Moreover, the yield strength increment caused by precipitation strengthening and peak work-hardening rate of AT24 steel are up to 27.8 MPa and 65 GPa, respectively. The entire mechanical properties are characterized by NanoBlitz three-dimensional (3D) maps, and the values of nano-hardness and Young's modulus of AT24 steel are greater than 16.86 GPa and 370 GPa.