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The Microstructure and Mechanical Properties of Welded Joints of Hot-Rolled and Post-Weld Solution-Treated Fe-12.5Mn-9.8Al-1.0C Low-Density Steel

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Abstract

In this study, the microstructural evolutions, phase equilibrium, mechanical properties and fracture mechanism of hot-rolled and post-weld solution-treated Fe-12.5Mn-9.8Al-1.0C(wt.%) low-density steel welded joints were investigated. Optical microscopy (OM), scanning electron microscope (SEM), eelectron backscatter diffraction (EBSD) and x-ray diffraction (XRD) were used to analyze microstructure and phases of the weld metal. Tensile test and microhardness test were inspected to determine the mechanical properties. Tensile fracture morphology was also determined by SEM. The results illustrated that welded joint was composed of austenite and annealing twins. Compared with the hot-rolled experimental steel, the strength and hardness of the post-weld solution-treated steel were reduced, but the elongation was increased. Especially, when the solution temperature was 950 °C, the elongation increased to 10.6%, which improved the plasticity and the quality of the welded joint.

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Acknowledgments

The authors gratefully acknowledge the National Natural Science Fund (No. 51674004), and Anhui Provincial Natural Science Foundation (No. 2108085ME143), and Anhui Provincial Universities Natural Science Research Project (No. KJ2021ZD0045).

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Authors and Affiliations

  1. Anhui Province Key Laboratory of Metallurgical Engineering & Resources Recycling, Anhui University of Technology), Ma’anshan, 243002, People’s Republic of China

    **ng Mei, Zhang **ao-feng, Lin Fang-min & Zhang Peng-yan

  2. School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan, 243002, People’s Republic of China

    **ng Mei, Wan Ya-xiong, Zhang **ao-feng, Lin Fang-min, Zhang Peng-yan, Yang Yong, Wang Yong-jian & Huang Zhen-yi

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  1. **ng Mei
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Mei, X., Ya-xiong, W., **ao-feng, Z. et al. The Microstructure and Mechanical Properties of Welded Joints of Hot-Rolled and Post-Weld Solution-Treated Fe-12.5Mn-9.8Al-1.0C Low-Density Steel. J. of Materi Eng and Perform 32, 4892–4901 (2023). https://doi.org/10.1007/s11665-022-07455-3

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