Journal ArticleDOI
Theory of the effect of dynamic strain aging on mechanical properties
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In this paper, the authors described dynamic strain aging (DSA) in solid solutions as diffusion of solute atoms to mobile dislocations, temporarily arrested at obstacles, and calculated the dependence of the flow stress on strain rate, temperature, and strain in the presence of DSA.Abstract:
Dynamic strain aging (DSA) in solid solutions is described as diffusion of solute atoms to mobile dislocations, temporarily arrested at obstacles. As a consequence the solute concentration experienced locally by the dislocations depends on the time of arrest and the solute diffusion coefficient. Starting from this idea the dependence of the flow stress on strain rate, temperature, and strain in the presence of DSA is calculated. A criterion for the onset of serrated yielding is formulated. Finally the change in strain rate sensitivity due to DSA is calculated. The theory allows a qualitative and in some respects a quantitative comparison with experimental results of which some examples are given.read more
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Book ChapterDOI
Plastic Deformation and Strain Localizations
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Crystal Orientation Dependence of the Portevin–Le Chatelier Effect in Instrumented Indentation: A Case Study in Twinning-Induced Plasticity Steels
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Book ChapterDOI
Mechanical Properties of Solid Solutions and Related Topics
TL;DR: A general overview of the mechanisms of dislocation motion in solid solutions can be found in this paper, where the authors consider the dislocation overcoming a single obstacle and then a random field of obstacles, first at zero, then at finite temperatures, and discuss the correlated motion of a dislocation group in more concentrated short-range ordered solid solutions.
Journal ArticleDOI
Accurate finite element modeling of the mechanical behavior of SS304 across the peak dynamic strain aging temperatures
TL;DR: In this article , a constitutive model of DSA was proposed by performing necessary augmentations to a conventional material model, which could accurately capture the DSA behaviour of austenitic stainless steel 304 for different strain rates over a range of temperatures across the peak DSA temperatures.
Dissertation
The effect of nitrogen and inclusions on fracture and fatigue of steel.
TL;DR: In this paper, a modified Ashby model is presented which enables engineering evaluations of the effect of volume fraction of MnS inclusions (V[f]), and free interstitial content (N[f]) on the strain to fracture from 20°C to 300°C.
References
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Journal ArticleDOI
A model for the Portevin-Le Chatelier effect in substitutional alloys
TL;DR: In this article, the authors derived a model for the onset of the Portevin-Le Chatelier effect in substitutional alloys, based on the solute locking of dislocations temporarily arrested at obstacles in the glide path.
Journal ArticleDOI
Mathematics of the portevin-le chatelier effect
TL;DR: In this article, it is shown mathematically that the strain rate at any point in the tensile material must make jumps as a function of time, whenever the stress as the function of strain rate, for given strain, goes through a maximum and minimum.
Journal ArticleDOI
Serrated yielding and inhomogeneous deformation in Au(14at%Cu)
A. Wijler,J.Schade van Westrum +1 more
Journal ArticleDOI
The onset of serrated yielding in Au(Cu) alloys
TL;DR: In this article, the onset of serrated yielding in Au(Cu) alloys has been investigated as a function of strain rate, temperature, Cu concentration and initial state of order both in prequenched and furnace cooled specimens.