Journal ArticleDOI
Stretchability of Prior Cold Worked AISI Type 304 Stainless Steel Sheet.
C. Ravishankar,R. Krishna Kumar +1 more
TLDR
In this paper, the authors investigated the effect of prior cold work on the stretchability of type 304 stainless steel sheet and showed that for a substantial range of strain ratios from plane strain towards equibiaxial, sheets with lower levels of prior work show sharply increasing ductility.Abstract:
The article presents the results of an investigation of the effect of prior cold work on the stretchability of type 304 stainless steel sheet. The forming limit diagrams show decreased levels with increasing prior work. However, when the limits are plotted as total equivalent strain as a function of strain ratio, the ductility increases with prior cold work. Also, for a substantial range of strain ratios from plane strain towards equibiaxial, sheets with lower levels of prior cold work show sharply increasing ductility. The first observation is explained in terms of the adiabatic temperature rise and the temperature sensitivity of the strain-induced transformation (that occurs in type 304 stainless steel), which influences the strain hardening in the material. The second observation is understood in terms of the kinetics of the transformation, which depends on the state of stress. Finite element simulations using a model taking into account the strain-induced transformation also reveal many of the trends ...read more
Citations
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Journal ArticleDOI
Effect of Prior Deformation Above Md Temperature on Tensile Properties of Type 304 Metastable Austenitic Stainless Steel
C. Teena Mouni,C. Teena Mouni,C. Ravishankar,Shaju K. Albert,Shaju K. Albert,Pradyumna Kumar Parida +5 more
TL;DR: In this article, the room temperature tensile properties of type 304, a metastable austenitic stainless steel, prior rolled above room temperature (200 °C and 300 °C) are compared with mill-annealed and material prior rolled at room temperature.
References
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Journal ArticleDOI
A theoretical sensitivity analysis for full- dome formability tests: parameter study for n, m, r, and μ
TL;DR: In this article, an axisymmetric version of the full-dome cup test was analyzed using SHEET-3 [a 3D finite element method (FEM) program] to determine the sensitivity of the test to parametersn,m, r, and μ.
Journal ArticleDOI
The effect of temperature and deformation rate on transformation-dependent ductility of a metastable austenitic stainless steel
C.P. Livitsanos,P.F. Thomson +1 more
TL;DR: The maximum elongation temperature (MET), the temperature at which the major principal strain is maximum, determined from tests in uniaxial tension, is usually quoted The authors confirm that formation of sufficient martensite in the region of incipient instability close to the instability strain is responsible for increased tensile ductility, but there is no unique MET for a given steel It depends, critically, on the rate of loading.
Journal ArticleDOI
The effect of grain size on the bulk formability and tensile properties of austenitic stainless steel types 304 and 316
E. Ulvan,A. Koursaris +1 more
TL;DR: In this article, the formabilities and tensile properties of stainless steel types 304 and 316 of various grain sizes were measured by means of tensile and compression tests, and it was found that variation in grain size had no significant effect on formability, but that the tensile property of the materials varied slightly.
Journal ArticleDOI
Sheet stretching: A theoretical-experimental comparison
TL;DR: In this article, numerical solutions of axisymmetric sheet stretching employing an experimentally determined stress-strain curve and measured overall coefficient of friction along the punch-sheet interface are presented.
Journal ArticleDOI
Forming limit analysis of hemispherical-punch stretch forming
Tung-Sheng Yang,Tze-Chi Hsu +1 more
TL;DR: In this article, the authors combine elastic-plastic membrane finite elements and forming limit theory to determine the limiting dome height of axisymmetric stretch forming, which is based on the flow rule associated with Hill's quadratic yield criterion for anisotropic material.
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