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<p>The effect of Mo on dual-phase precipitation behavior and tensile properties of Fe26Mn8Al1.2C–(2–3.5&#xa0;wt.%) Mo lightweight austenitic steels after annealing at 700&#xa0;°C was investigated by electron backscatter diffraction, transmission electron microscopy, hardness and tensile tests. Alloying with Mo in the steels promotes the precipitation of Mo<sub>2</sub>C carbides while inhibits the precipitation of κ-carbides. The addition of Mo exceeding 2.5&#xa0;wt.% facilitates the precipitation of intragranular Mo<sub>2</sub>C carbides, whereas with up to 2.5&#xa0;wt.% Mo, only intergranular Mo<sub>2</sub>C carbides precipitate. With containing more Mo in the steels, the strength increases due to enhancement of precipitation strengthening and solid solution strengthening, while ductility gradually decreases. 3Mo steel exhibits excellent overall mechanical properties, with the synergistic increase in strength, ductility, and work-hardening rate, which can be attributed to the precipitation of fine intragranular&#xa0;Mo<sub>2</sub>C distributed uniformly in the matrix and the suppression of the formation of coarsened κ-carbides. However, in 3.5Mo steel, abundant coarsened Mo<sub>2</sub>C precipitation strongly interacts with dislocations to promote crack propagation along non-coherent interfaces, leading to a high initial work-hardening rate but severe ductility loss.</p>

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Effect of Mo on precipitation behavior and tensile properties of Fe26Mn8Al1.2C–xMo lightweight austenitic steels

  • 期刊论文

  • 发表日期：

    2025年5月25日

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  • Xu-yang-fan Qiu,
  • Ying-chun Wang,
  • Kai-lun Zeng,
  • Jin He,
  • Chong Gao,
  • Zhi-ping Xiong,
  • Xing-wang Cheng

摘要

The effect of Mo on dual-phase precipitation behavior and tensile properties of Fe26Mn8Al1.2C–(2–3.5 wt.%) Mo lightweight austenitic steels after annealing at 700 °C was investigated by electron backscatter diffraction, transmission electron microscopy, hardness and tensile tests. Alloying with Mo in the steels promotes the precipitation of Mo2C carbides while inhibits the precipitation of κ-carbides. The addition of Mo exceeding 2.5 wt.% facilitates the precipitation of intragranular Mo2C carbides, whereas with up to 2.5 wt.% Mo, only intergranular Mo2C carbides precipitate. With containing more Mo in the steels, the strength increases due to enhancement of precipitation strengthening and solid solution strengthening, while ductility gradually decreases. 3Mo steel exhibits excellent overall mechanical properties, with the synergistic increase in strength, ductility, and work-hardening rate, which can be attributed to the precipitation of fine intragranular Mo2C distributed uniformly in the matrix and the suppression of the formation of coarsened κ-carbides. However, in 3.5Mo steel, abundant coarsened Mo2C precipitation strongly interacts with dislocations to promote crack propagation along non-coherent interfaces, leading to a high initial work-hardening rate but severe ductility loss.