Constitutive laws for steady state deformation of metals, a microstructural model

Journal Article · Sat Jul 15 04:00:00 EDT 1995 · Scripta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-716X(95)00103-3· OSTI ID:99259

Nes, E ^[1]

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1. Norwegian Inst. of Technology, Trondheim (Norway). Dept. of Metallurgy

Based on extensive investigations of the steady state conditions for creep and hot working, Sellars and McG. Tegart demonstrated that the flow stress was well represented by the following relation: {sigma}{sub s} = 1/{alpha}{prime} Arc sinh (Z/A{prime}){sup 1/n} where {alpha}{prime}, A{prime}, n are temperature independent constants and Z is the Zener-Hollomon parameter, Z = {dot {var_epsilon}} exp U/kT, where {dot {var_epsilon}} is the applied strain rate and U is an activation energy. This relationship is widely used in the modelling of metal forming processes such as hot rolling, forging and extrusion. The objective this work is to explore the possibilities for deriving an alternative, physically based, relationship which is capable of correlating the steady state flow stress both to the alloy condition and the microstructural characteristics of steady state deformation.

• OSTI ID: 99259
• Journal Information: Scripta Metallurgica et Materialia, Journal Name: Scripta Metallurgica et Materialia Journal Issue: 2 Vol. 33; ISSN SCRMEX; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
ALUMINIUM BASE ALLOYS
CREEP
DEFORMATION
DISLOCATIONS
EXTRUSION
FLOW STRESS
FORGING
FRICTION
HOT WORKING
IRON ADDITIONS
MAGNESIUM ALLOYS
MANGANESE ALLOYS
MATHEMATICAL MODELS
MICROSTRUCTURE
SILICON ADDITIONS
STRAIN RATE