A new critical point on the stress-strain curve: Delineation of dynamic recrystallization from grain growth. (15th February 2017)

• Record Type: Journal Article
• Authors: Aashranth, B; Arvinth Davinci, M; Samantaray, Dipti; Borah, Utpal; Albert, Shaju K.
• Is Part Of: Materials & design. Volume 116(2017)
• Page Start: 495
• Page End: 503
• Publication Date: 2017-02-15
• Subjects: Hot deformation -- Dynamic recrystallization -- Grain growth -- Thermodynamics of plasticity; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2016.12.053
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: A new critical point termed 'stabilisation stress' ( σ stab ) is identified in high temperature stress-strain curves. σ stab represents the beginning of a stage in the hot working process where grain growth becomes the dominant microstructural phenomenon. This point is detected using an irreversible thermodynamics approach. Predicted correlations between σ stab and grain growth are experimentally validated for structural steels, enabling the delineation of dynamic recrystallization from grain growth based on stress-strain curves. Graphical abstract: Highlights: Grain growth outpaces dynamic recrystallization (DRX) in steels if a new critical condition is met. Flow stress data alone is sufficient to determine a parameter denoting this critical condition. Final grain size is correlated with the parameter across several hot working domains. The parameter shares a fixed and material-independent relationship with onset of DRX.