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Hot Deformation Behavior and Processing Map of 40MnBH Alloy Steel
Author(s) -
Chai RongXia,
Zhang ChuanWei,
Guo Wei,
Zhang Feng
Publication year - 2017
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201600281
Subject(s) - materials science , deformation (meteorology) , strain rate , isothermal process , flow stress , compression (physics) , microstructure , alloy , constitutive equation , metallurgy , stress (linguistics) , composite material , structural engineering , finite element method , thermodynamics , linguistics , philosophy , physics , engineering
The hot deformation behavior of the 40MnBH alloy is investigated by isothermal compression tests at the temperature of 900–1200 °C with the strain rate of 0.05, 0.5, and 5s −1 , and the degree of compression ranging from 15 to 60%. The effects of deformation parameters are studied through the true stress–strain curve under different deformation conditions. The processing maps are constructed based on the dynamic material model. Microstructures of 40MnBH steel at different deformation conditions are observed. The results show that the stress of the alloy has a dependence on strain rate and deformation temperature. A constitutive model is built, which described the flow stress behavior of the alloy. The processing maps reveal that with the increase in the degree of compression, the instability regions decrease. The results of processing maps have been verified through the microstructures of the 40MnBH steel.