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Characterization of Hot Deformation Behavior and Pro-cessing Map of Powder Metallurgical High-Tungsten Steel
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1.School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;2.National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing Institute of Technology, Beijing 100081, China

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    Abstract:

    Hot deformation behavior of powder metallurgical high tungsten alloy steel was investigated by Gleeble thermal simulator in a temperature range of 900~1100 °C and a strain rate range of 0.001~1 s-1. The results show that the flow stress decreases with the decrease of strain rate and the increase of deformation temperature. A constitutive equation is derived with Arrhenius hyperbolic sine function, and a processing map is constructed. The activation energy is 377 kJ/mol. The suitable processing regions are 1000~1100 °C/0.001~0.01 s-1. The precipitation of tungsten-rich μ phase occurs during hot deformation process. Microvoids and micro-cracks form in the bulging region of the specimen. The amount of microvoid increases with the increase of strain rate and the decrease of temperature. The μ phase precipitation improves the high temperature strength of the steel.

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[Liu Anjin, Wang Lin, Cheng Xingwang, Xiong Zhiping, Ning Zixuan. Characterization of Hot Deformation Behavior and Pro-cessing Map of Powder Metallurgical High-Tungsten Steel[J]. Rare Metal Materials and Engineering,2021,50(12):4201~4208.]
DOI:10.12442/j. issn.1002-185X.20200733

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History
  • Received:September 20,2020
  • Revised:February 07,2021
  • Adopted:February 09,2021
  • Online: December 30,2021
  • Published: December 24,2021