Abstract：Dealing with the 900 MPa grade hot rolled steel with precipitation strengthening, the hot deformation behavior was investigated with a compression test on Gleeble-3800 simulator with a temperature range of 950－1 150 ℃ and strain rate range of 0.01-10.0 s-1. The accurate values of peak stress were obtained from the stress-strain curve. A hyperbolic sine equation was employed to describe the relationship between the peak stress and Zener-Hollomon parameter, in which the activation energy of deformation and other constants were obtained using regression analysis. The flow stress constitutive equation by hot compression was obtained and it was tested and verified. The results show that the flow stress predicted by the proposed models agrees well with the experimental results．This can provide reference for the limited load during the process of forming and for the choosing of equipment.
Nagao A, Ito T, Obinata T.Development of YP 960 and 1100MPa class ultra-high strength steel plates with excellent toughness and high resistance to delayed fracture for construction and industrial machinery[J][J].JFE Tech Rep, 2008, -(11):13-18
[2]
Nagao A, Ito T, Obinata T.Development of YP 960 and 1100MPa class ultra-high strength steel plates with excellent toughness and high resistance to delayed fracture for construction and industrial machinery[J][J].JFE Tech Rep, 2008, -(11):13-18
Sellars C.M.,Tegart WJ. McG. On the mechanism of hot deformation[J].Acta Metallurgical, 1966, 14(9):1136--
[6]
Sellars C.M.,Tegart WJ. McG. On the mechanism of hot deformation[J].Acta Metallurgical, 1966, 14(9):1136--
[7]
Jonas J.J.,Sellars CM.,Tegart W. J. McG. Strength and structure under Hot-Working conditions[J].Metal Reviews, 1969, 14(130):1--
[7]
Jonas J.J.,Sellars CM.,Tegart W. J. McG. Strength and structure under Hot-Working conditions[J].Metal Reviews, 1969, 14(130):1--
[8]
Sellars C.M.,Tegart WJ. McG. Hot workability[J].International Metallurgical Reviews, 1972, 17(158):1--
[8]
Sellars C.M.,Tegart WJ. McG. Hot workability[J].International Metallurgical Reviews, 1972, 17(158):1--
[9]
Zener C.Hollomon JH.. Effect of strain rat upon the plastic of steel[J].J. Appl. Phys, 1944, 15(1):22-27
[9]
Zener C.Hollomon JH.. Effect of strain rat upon the plastic of steel[J].J. Appl. Phys, 1944, 15(1):22-27
[10]
Medina S.F.,Hernandez CA.. General expression of Zener-Hollomon parameter as a function of the chemical composition of low alloy and microalloy steels[J].Acta. Mater, 1996, 44(1):137-140
[10]
Medina S.F.,Hernandez CA.. General expression of Zener-Hollomon parameter as a function of the chemical composition of low alloy and microalloy steels[J].Acta. Mater, 1996, 44(1):137-140
2015, Vol. 50 
