TY - JOUR
T1 - Modelling of hardening due to grain growth for a superplastic alloy
AU - Cheong, Boon
AU - Lin, Jianguo
AU - Ball, Alan
PY - 2001/12/20
Y1 - 2001/12/20
N2 - Combined analytical and numerical optimisation procedures have been developed to determine the material constants in superplastic constitutive equations. The conventional grain growth rate equation has been modified to enable accurate modelling of the isothermal and plastic-strain-induced grain growths for different microstructures of a titanium alloy. A set of unified viscoplastic constitutive equations for Ti-6Al-4V at 927degreesC, which incorporates isotropic hardening and grain growth, has been fully determined from experimental data for different initial grain sizes and strain rates. Close agreement between the predicted and experimental stress-strain relationships has been achieved. In addition, the contributions of hardening constituents, such as strain-rate hardening, isotropic hardening and the hardening due to grain growth have been modelled. (C) 2001 Elsevier Science B.V All rights reserved.
AB - Combined analytical and numerical optimisation procedures have been developed to determine the material constants in superplastic constitutive equations. The conventional grain growth rate equation has been modified to enable accurate modelling of the isothermal and plastic-strain-induced grain growths for different microstructures of a titanium alloy. A set of unified viscoplastic constitutive equations for Ti-6Al-4V at 927degreesC, which incorporates isotropic hardening and grain growth, has been fully determined from experimental data for different initial grain sizes and strain rates. Close agreement between the predicted and experimental stress-strain relationships has been achieved. In addition, the contributions of hardening constituents, such as strain-rate hardening, isotropic hardening and the hardening due to grain growth have been modelled. (C) 2001 Elsevier Science B.V All rights reserved.
KW - material hardening
KW - superplasticity
KW - grain growth
UR - http://www.scopus.com/inward/record.url?scp=0035924644&partnerID=8YFLogxK
U2 - 10.1016/S0924-0136(01)00929-3
DO - 10.1016/S0924-0136(01)00929-3
M3 - Article
VL - 119
SP - 361
EP - 365
JO - Journal of Materials Processing Technology
JF - Journal of Materials Processing Technology
ER -