METALS AND METAL MATRIX COMPOSITES |
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Construction and Optimization of Hot Deformation Constitutive Equation of 30Cr4MoNiV Ultra-high-strength Steel |
CHEN Gang1,*, YAO Yuanchao1, JIA Yuzhen2,3, SU Bin1, LIU Guoyue2,3, ZENG Bin4
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1 College of Materials Science and Engineering, Hunan University, Changsha 410082, China 2 Sawing Engineering Research Center of Hunan Province, Changsha 410200, China 3 Bichamp Cutting Technology (Hunan) Co., Ltd., Changsha 410200, China 4 Hunan Valin Lianyuan Iron and Steel Co., Ltd., Loudi 417000, Hunan, China |
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Abstract In this work, the hot deformation behavior of 30Cr4MoNiV ultra-high-strength (UHS) steel is investigated by isothermal compression tests using the Gleeble-3500 thermal simulation machine at 1 173—1 373 K under the strain rate of 0.01—10 s-1, and the optimized constitutive equation with strain-dependent constants suitable for 30Cr4MoNiV UHS steel is established. The results show that the flow stress increases with the increase of the strain rate and the decrease of the deformation temperature. The constitutive equation constructed by hyperbolic sine function has the highest accuracy among the three constitutive equations constructed by power law function, exponential function and hyperbolic sine function. Based on the hyperbolic sine function and the strain-dependent constants, the optimized constitutive equation can accurately predict the flow stress of 30Cr4MoNiV UHS steel in the process of hot processing.
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Published: 10 November 2022
Online: 2022-11-03
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Fund:National Natural Science Foundation of China (51971091). |
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