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Hot Processing Maps and Microstructural Characteristics of A357 Alloy

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Abstract

In this paper, the hot deformation behavior of A357 alloy was investigated by hot compression tests. Isothermal hot compression simulation tests for A357 alloy were carried out at the conditions of deformation temperature of 350-470 °C, strain rate of 0.001-10 s−1 and engineering strain of 50%. Based on the Prasad instability criterion and dynamic material model, the hot processing maps of A357 alloy were constructed. The microstructure of compressed samples at different areas of the hot processing map was characterized by metallographic and scanning electron microscope and transmission electron microscope. The experimental results showed that the unstable processing zone of A357 alloy was mainly distributed in the high strain rate (10 s−1) and low-temperature (350, 380 °C) region. With an increase in the strain, the unstable zone expanded from low temperature to high temperature (470 °C). The ideal deformation conditions were deformation temperatures of 380-410 °C and strain rates of 0.001-0.01 s−1, and deformation temperatures of 440-470 °C and strain rates of 0.01-1 s−1. When the A357 alloy was extruded with the optimal hot processing parameters, the results suggested that hot extrusion could make the microstructure uniform and fine, thereby improving mechanical properties, especially when the elongation was up to 19.5% higher than the as-cast A357 alloy.

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Acknowledgments

This study was funded by the National Natural Science Foundation of China (Grant No. 51901058)

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Authors and Affiliations

  1. School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin, 150040, China

    Fuwei Kang, Shijie Wei, Jimin Zhang, Enhao Wang, Dezhi Fan & Shanshan Wang

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  1. Fuwei Kang
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Correspondence to Enhao Wang.

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Kang, F., Wei, S., Zhang, J. et al. Hot Processing Maps and Microstructural Characteristics of A357 Alloy. J. of Materi Eng and Perform 29, 7352–7360 (2020). https://doi.org/10.1007/s11665-020-05210-0

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