Constitutive modelling and microstructure evolution of 40Cr alloy steel during hot compression deformation. (July 2013)

• Record Type: Journal Article
• Authors: Teng, L.; Guo, C.; Wang, L. Z.
• Is Part Of: Materials research innovations. Volume 17(2013)Supplement 1
• Page Start: 135
• Page End: 143
• Publication Date: 2013-07
• Subjects: 40Cr alloy steel, -- Hot deformation, -- Flow stress, -- Microstructure, -- Constitutive equation; Materials -- Research -- Periodicals; Matériaux -- Recherche -- Périodiques; 620.1105
• DOI: 10.1179/1432891713Z.000000000204
• Languages: English
• ISSNs: 1432-8917

Abstract

Abstract : Hot deformation behaviour of 40Cr was investigated by conducting hot compression tests at the temperature range of 750–1050°C and the strain rate range of 0·01–10 s −1 on a Gleeble 1500 thermal mechanics simulator. Most true stress–strain curves show that the flow stress increases until a peak value and then decreases with the increasing of the strain, which ends up with a stationary stage. Further microstructural observation confirms the occurrence of dynamic recrystallisation behaviour of 40Cr. The experimental data were used to develop a constitutive equation on the basis of the Arrhenius equation. In the constitutive equation, the effect of strain on deformation behaviour is incorporated, and the flow stress correction parameters p 1, p 2, p 3, p 4 and p 5 are represented by the Zener–Holloman parameter. The flow stresses predicted by the constitutive equation show good agreement with the experimental stresses, with the mean error <4·86%.