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Thermal stability of retained austenite and mechanical properties of medium-Mn steel during tempering treatment

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Abstract

The thermal stability of retained austenite (RA) and the mechanical properties of the quenched and intercritical annealed 0.1C-5Mn steel with the starting ultrafine lamellar duplex structure of ferrite and retained austenite during tempering within the range from 200 to 500 °C were studied by X-ray diffraction (XRD), transmission electron microscopy (TEM) and tensile testing. The results showed that there was a slight decrease in the RA volume fraction with increasing tempering temperature up to 400 °C. This caused a slight increase in the ultimate tensile strength (UTS) and a slight decrease in the total elongation (TE); thus, the product of UTS to TE (UTS×TE) as high as 31 GPa • % was obtained and remained nearly unchanged. However, a portion of the RA began to decompose when tempered at 500 °C and thus caused a ~35% decrease of the RA fraction and a ~16% decrease of the value of UTS×TE. It is concluded that the ultrafine lamellar duplex structure is rather stable and the excellent combination of strength and ductility could be retained with tempering temperature up to 400 °C. Thus, thermal processes such as galvanization are feasible for the tested steel provided that their temperatures are not higher than 400 °C.

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Authors and Affiliations

  1. School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, 100044, Beijing, China

    Xiao-li Zhao, Yong-jian Zhang, Cheng-wei Shao & Wei-jun Hui Ph.D. (Prof.)

  2. Central Iron and Steel Research Institute, 100081, Beijing, China

    Xiao-li Zhao & Han Dong

Authors
  1. Xiao-li Zhao
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  2. Yong-jian Zhang
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  3. Cheng-wei Shao
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  4. Wei-jun Hui Ph.D.
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  5. Han Dong
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Correspondence to Wei-jun Hui Ph.D..

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Zhao, Xl., Zhang, Yj., Shao, Cw. et al. Thermal stability of retained austenite and mechanical properties of medium-Mn steel during tempering treatment. J. Iron Steel Res. Int. 24, 830–837 (2017). https://doi.org/10.1016/S1006-706X(17)30123-1

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  • DOI: https://doi.org/10.1016/S1006-706X(17)30123-1

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