scholarly journals Evolution of Texture and Yield Locus of AISI 409 Ferritic Stainless Steel

1993 ◽  
Vol 21 (4) ◽  
pp. 207-217 ◽  
Author(s):  
N. Mingolo ◽  
A. Pochettino ◽  
C. Vial-Edwards
Keyword(s):  
Plastic Deformation ◽  
Stainless Steel ◽  
Strain Rate ◽  
Strain Hardening ◽  
Ferritic Stainless Steel ◽  
Texture Evolution ◽  
Rate Sensitivity ◽  
Yield Locus ◽  
Slip Systems ◽  
Hardening Process

The evolution of texture and yield locus of AISI 409 ferritic stainless steel under different deformation paths was analyzed.Texture evolution with plastic deformation was predicted by two models: Taylor (TPG), assuming pencil glide in {hkl}〈111〉 slip systems and Viscoplastic under the relaxed constraint assumption (VRC), considering the following slip systems: {110}〈111〉, {112}〈111〉, and {123}〈111〉, selected according to a strain rate sensitivity law. TPG model tends to predict some stronger developments of texture than the VRC model.Predictions of stress–strain curves along different loading paths with TPG and VRC models were very close to experimental results. Texture evolution did not have a significant effect to modify the rate and the isotropy of the strain hardening process of AISI 409 ferritic stainless steel.

Strain Rate Sensitivity, Strain Hardening, and Yield Behavior of 304L Stainless Steel

1986 ◽  
Vol 108 (4) ◽  
pp. 344-353 ◽  
Author(s):  
M. G. Stout ◽  
P. S. Follansbee
Keyword(s):  
Stainless Steel ◽  
Strain Rate ◽  
Strain Hardening ◽  
Strain Rate Sensitivity ◽  
Work Hardening ◽  
Rate Sensitivity ◽  
Yield Locus ◽  
304L Stainless Steel ◽  
Strain Rates ◽  
Yield Behavior

Sheet and rod stock of 304L stainless steel were tested in uniaxial tension and compression at strain rates between 10−4 s−1 and 104 s−1. To evaluate the yield locus behavior of the sheet material, multiaxial experiments were performed at a strain rate of 10−3 s−1. We have analyzed these results in terms of existing strain-rate sensitivity, work hardening, and yield locus models. Strain-rate sensitivity was found to follow a thermal activation law over the entire range of strain rates used in this investigation. The best description of strain hardening did depend on the strain range to which the data were fit. The Voce law was the most accurate at large strains (ε > 0.40), whereas at small strains, in the vicinity of yield, the laws of either Swift or Ludwik were the most accurate. A simple power law description of work hardening was inadequate over all levels of strain. We examined a number of yield criteria, both isotropic and anisotropic, with respect to the biaxial yield behavior. Bassani’s yield criterion gave the best fit to our experimental results. However, the simple von Mises yield function also gave an acceptable prediction of yield strength and direction of current plastic strain rate. The yield criteria of Hill, both the quadratic and nonquadratic versions, did not match the experimental data. We feel that these results have direct application to the selection of the proper constitutive laws for the finite element modeling of the deformation of 304L stainless steel.

scholarly journals Deformation Texture Evolution in Flat Profile AlMgSi Extrusions: Experiments, FEM, and Crystal Plasticity Modeling

2021 ◽  
Vol 8 ◽  
Author(s):  
Tomas Manik ◽  
Knut Marthinsen ◽  
Kai Zhang ◽  
Arash Imani Aria ◽  
Bjørn Holmedal
Keyword(s):  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Crystal Plasticity ◽  
Texture Evolution ◽  
Rate Sensitivity ◽  
Deformation Texture ◽  
Fiber Texture ◽  
Electron Back Scatter Diffraction ◽  
Slip Systems ◽  
Flat Profile

In the present work, the deformation textures during flat profile extrusion from round billets of an AA6063 and an AA6082 aluminium alloy have been numerically modeled by coupling FEM flow simulations and crystal plasticity simulations and compared to experimentally measured textures obtained by electron back-scatter diffraction (EBSD). The AA6063 alloy was extruded at a relatively low temperature (350°C), while the AA6082 alloy, containing dispersoids that prevent recrystallization, was extruded at a higher temperature (500°C). Both alloys were water quenched at the exit of the die, to maintain the deformation texture after extrusion. In the center of the profiles, both alloys exhibit a conventional β-fiber texture and the Cube component, which was significantly stronger at the highest extrusion temperature. The classical full-constraint (FC)-Taylor and the Alamel grain cluster model were employed for the texture predictions. Both models were implemented using the regularized single crystal yield surface. This approach enables activation of any number and type of slip systems, as well as accounting for strain rate sensitivity, which are important at 350°C and 500°C. The strength of the nonoctahedral slips and the strain-rate sensitivity were varied by a global optimization algorithm. At 350°C, a good fit could be obtained both with the FC Taylor and the Alamel model, although the Alamel model clearly performs the best. However, even with rate sensitivity and nonoctahedral slip systems invoked, none of the models are capable of predicting the strong Cube component observed experimentally at 500°C.

scholarly journals Strain Rate Sensitivity Behaviour of a Chrome-Nickel Austentic-Ferritic Stainless Steel and its Constitutive Modelling

2018 ◽  
Vol 58 (10) ◽  
pp. 1840-1849 ◽  
Author(s):  
Amit Kumar ◽  
Aman Gupta ◽  
Rajesh Kisni Khatirkar ◽  
Nitish Bibhanshu ◽  
Satyam Suwas
Keyword(s):  
Stainless Steel ◽  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Ferritic Stainless Steel ◽  
Rate Sensitivity ◽  
Constitutive Modelling

scholarly journals Description of Texture and Yield Locus Evolution Under Different Deformation Paths of Copper Sheet

1995 ◽  
Vol 23 (4) ◽  
pp. 237-248
Author(s):  
N. Mingolo ◽  
C. Vial-Edwards
Keyword(s):  
Texture Evolution ◽  
Rate Sensitivity ◽  
Yield Locus ◽  
Slip Systems ◽  
Copper Sheet ◽  
Deformation Path ◽  
Loading Paths ◽  
Self Consistent ◽  
Consistent Approach ◽  
Active Slip

The evolution of texture with plastic deformation along different loading paths has been studied for a commercial DHP copper sheet metal. Two models have been utilized to predict the evolution of textures: Viscoplastic under Relaxed Constraints conditions (VRC) and a Self Consistent approach (SC) with viscoplastic conditions, where the {111}<110> active slip systems were selected according to a strain rate sensitivity law.The stress-strain curves along different loading paths were calculated taking into account the texture evolution predicted by VRC and SC models. Predictions with the SC formulation were very close to experimental results. Texture evolution depended on the deformation path.

Evaluation of Creep Constitutive Equations for Type 304 Stainless Steel Under Repeated Multiaxial Loading

1982 ◽  
Vol 104 (3) ◽  
pp. 159-164 ◽  
Author(s):  
Y. Ohashi ◽  
N. Ohno ◽  
M. Kawai
Keyword(s):  
Stainless Steel ◽  
Strain Rate ◽  
Strain Hardening ◽  
Deviatoric Stress ◽  
304 Stainless Steel ◽  
Multiaxial Loading ◽  
Mixed Hardening ◽  
Principal Axes ◽  
Type 304 ◽  
Type 304 Stainless Steel

Four kinds of creep constitutive models, i.e., strain-hardening, modified strain-hardening, kinematic-hardening, and mixed-hardening theory, are evaluated on the basis of creep-test results on type 304 stainless steel at 650°C under repeated multiaxial loading. The predictions of the four models are compared with the experimental results. It is shown that substantial differences appear among these predictions under large rotations of the principal axes of the deviatoric stress tensor, and that none of them can describe with sufficient accuracy the transient increase of strain-rate and the noncollinearity between the deviatoric stress and creep strain-rate vectors which are observed just after the stress-rotations.

Finite Deflections of a Rigid-Viscoplastic Strain-Hardening Annular Plate Loaded Impulsively

1968 ◽  
Vol 35 (2) ◽  
pp. 349-356 ◽  
Author(s):  
Norman Jones
Keyword(s):  
Strain Rate ◽  
Strain Hardening ◽  
Strain Rate Sensitivity ◽  
Annular Plate ◽  
Dominant Role ◽  
Plate Thickness ◽  
Rate Sensitivity ◽  
Finite Deflections ◽  
Analytical Treatment ◽  
Rigid Plastic

A relatively simple analytical treatment of the behavior of a rigid-plastic annular plate subjected to an initial linear impulsive velocity profile is presented. The influence of finite deflections has been included in addition to strain-hardening and strain-rate sensitivity of the plate material. It is shown, for deflections up to the order of twice the plate thickness, that strain-hardening is unimportant, strain-rate sensitivity has somewhat more effect, while membrane forces play a dominant role in reducing the permanent deflections.

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