scholarly journals A Numerical Study of Slip System Evolution in Ultra-Thin Stainless Steel Foil

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1819 ◽  
Author(s):  
Zhongkai Ren ◽  
Wanwan Fan ◽  
Jie Hou ◽  
Tao Wang
Keyword(s):  
Stainless Steel ◽  
Slip System ◽  
Numerical Study ◽  
Three Dimensional ◽  
304 Stainless Steel ◽  
Slip Systems ◽  
Deformation Degree ◽  
Engineering Strain ◽  
Stainless Steel Foil ◽  
Grain Orientations

In order to quantitatively describe the effect of the initial grain orientation on the inhomogeneous deformation of 304 austenitic stainless steel foil during tension, a three-dimensional uniaxial tension model was established, based on the crystal plasticity finite element method (CPFEM) and Voronoi polyhedron theory. A three-dimensional representative volume element (RVE) was used to simulate the slip deformation of 304 stainless steel foil with five typical grain orientations under the same engineering strain. The simulation results show that the number and characteristics of active slip systems and the deformation degree of the grain are different due to the different initial grain orientations. The slip systems preferentially initiate at grain boundaries and cause slip system activity at the interior and free surface of the grain. The Brass, S, and Copper oriented 304 stainless steel foil exhibits a high strain hardening index, which is beneficial to strengthening. However, the Cube and Goss oriented 304 stainless steel foil has a low deformation resistance and is prone to plastic deformation.

Multiscale Crystal Plasticity Simulation with Pseudo-Three-Dimensional Model on Ultrafine-Graining Based on Evolution of Dislocation Structures

2008 ◽  
Vol 584-586 ◽  
pp. 1057-1062 ◽  
Author(s):  
Yoshiteru Aoyagi ◽  
Naohiro Horibe ◽  
Kazuyuki Shizawa
Keyword(s):  
Slip System ◽  
Dislocation Structure ◽  
Crystal Plasticity ◽  
Three Dimensional ◽  
Slip Rate ◽  
Dislocation Cell ◽  
Reaction Diffusion Equations ◽  
Slip Systems ◽  
Dimensional Model ◽  
Three Dimensional Model

In this study, we develop a multiscale crystal plasticity model that represents evolution of dislocation structure on formation process of ultrafine-grained metal based both on dislocation patterning and geometrically necessary dislocation accumulation. A computation on the processes of ultrafine-graining, i.e., generation of dislocation cell and subgrain patterns, evolution of dense dislocation walls, its transition to micro-bands and lamellar dislocation structure and formation of subdivision surrounded by high angle boundaries, is performed by use of the present model. Dislocation patterning depending on activity of slip systems is reproduced introducing slip rate of each slip system into reaction-diffusion equations governing self-organization of dislocation structure and increasing immobilizing rate of dislocation with activation of the secondary slip system. In addition, we investigate the effect of active slip systems to the processes of fine-graining by using the pseudo-three-dimensional model with twelve slip systems of FCC metal.

Study of Static Recrystallization Microstructure Evolution of 304 Stainless Steel

2012 ◽  
Vol 152-154 ◽  
pp. 672-677
Author(s):  
Xiao Dong Zhao ◽  
Jian Sheng Liu ◽  
Hui Qin Chen ◽  
Xing Wang Duan ◽  
Wen Wu He
Keyword(s):  
Stainless Steel ◽  
Microstructure Evolution ◽  
Deformation Temperature ◽  
Static Recrystallization ◽  
Scientific Basis ◽  
304 Stainless Steel ◽  
Total Deformation ◽  
Deformation Degree ◽  
Grain Sizes ◽  
Metallographic Method

The effect of various deformation degree and temperature on static recrystallization of 304 stainless steel during two-passes hot compression deformation with the strain rate of 0.1s-1 was investigated by use of Gleeble-1500D thermo-mechanical simulation. It is indicated that deformation degree is the most obvious factor to static recrystallization. Besides, the grain sizes after deformation were also measured by metallographic method. The results show that the grain sizes decreased dramatically with the conditions of deformation temperature (1050°C), holding time (30s) and total deformation degree (0.35). The result has provides the corresponding scientific basis for the quality forecast of 304 stainless steel during hot thermoplastic deformation.

scholarly journals e EXPERIMENTAL & NUMERICAL STUDY OF BUCKLING BEHAVIOR FOR STAINLESS STEEL 304 ALLOY COLUMNS UNDER DYNAMIC LOADS

2019 ◽  
Vol 19 (4) ◽  
pp. 369-380
Author(s):  
Hussain Jasim AL Akawai ◽  
Khalid Mershid Aweed ◽  
Shawthab Ali Jaber
Keyword(s):  
Stainless Steel ◽  
Numerical Study ◽  
Compressive Load ◽  
Dynamic Loads ◽  
304 Stainless Steel ◽  
Column Length ◽  
Buckling Behavior ◽  
Stainless Steel 304 ◽  
Fixed End ◽  
The Mathematical Model

    In the present research the effect of corrosion on buckling behavior of 304 stainless steel with increasing of compressive dynamic loads was studied. There are long types of the columns were used. For compression test, there are 24 columns specimens were used in the dynamic axis, 12 columns tests were carried out with increasing in the dynamic axis of compressive load, while for the corrosion test was performed by using 12 specimens were buried for two months under the ground before tested them. The digital gauge was employed at the distance about 0.7 for the column length at the fixed end of column. has alarm system was used to define critical buckling and to avoid the failure of the specimen and installed at the distance equal to 0.7 of the column length from fixed end. The empirical results showed that the effect of negatively corrosion on mechanical properties of alloys with 2.53% reduction of ultimate tensile strength comparing with non-corroded specimens, in the other hand the corrosion will reduce the critical buckling load by 6% for two months. The experimental results comparing with the standard theories of the buckling behavior and with the finite element (ANSYS)  results to verify the mathematical model.

Numerical Study on the Laser Bending of Stainless Steel Foil with Pre-Stresses

2008 ◽  
Vol 35 (8) ◽  
pp. 1265-1270
Author(s):  
刘杰 Liu Jie ◽  
孙胜 Sun Sheng ◽  
管延锦 Guan Yanjin
Keyword(s):  
Stainless Steel ◽  
Numerical Study ◽  
Laser Bending ◽  
Stainless Steel Foil

Irradiation-induced precipitates in a neutron irradiated 304 stainless steel studied by three-dimensional atom probe

2011 ◽  
Vol 418 (1-3) ◽  
pp. 62-68 ◽  
Author(s):  
T. Toyama ◽  
Y. Nozawa ◽  
W. Van Renterghem ◽  
Y. Matsukawa ◽  
M. Hatakeyama ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Three Dimensional ◽  
Atom Probe ◽  
304 Stainless Steel

A Comparison of Grain Boundary Character Distributions between Grain Boundary Engineered Austenitic Stainless Steel and Pb-Ca Based Alloy

2013 ◽  
Vol 753 ◽  
pp. 83-86
Author(s):  
Wei Guo Wang ◽  
Xiao Ying Fang ◽  
Hong Guo
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Grain Boundary ◽  
304 Stainless Steel ◽  
Orientation Relationships ◽  
Boundary Character ◽  
Grain Boundary Character ◽  
Stainless Steel 304 ◽  
Grain Orientations ◽  
Austenitic Stainless Steel 304

Though there developed same concentrations of special grain boundaries (SBs) in grain boundary engineered (GBE) austenitic stainless steel (304 stainless steel) and a Pb-Ca based alloy, the makeup of SBs, size distribution of clusters of grains with ∑3n (n=1,2,3) orientation relationships (∑3n CG), and grain orientations (textures) are quite different between the two specimens, suggesting there have two different mechanisms separately governing the evolution of grain boundary character distributions (GBCDs) in the two types of materials during GBE processing.

Effects of Cold Working Under Pressure on Subsequent Yield

1972 ◽  
Vol 94 (3) ◽  
pp. 575-580 ◽  
Author(s):  
J. G. Hoeg ◽  
R. L. Davis
Keyword(s):  
Stainless Steel ◽  
Yield Surface ◽  
Cold Working ◽  
Axial Stress ◽  
Fluid Pressure ◽  
Three Dimensional ◽  
304 Stainless Steel ◽  
Compression Tests ◽  
Subsequent Yield Surface ◽  
Longitudinal Strains

A method utilizing high pressure fluid environments is described whereby a three-dimensional subsequent yield surface was determined for 304 stainless steel. Cylindrical parent specimens of this material were prestrained in axial compression under fluid pressure and then small subspecimens were sectioned from these parent specimens. Finite element techniques were used to optimize the parent specimen size so that a zone of uniform axial stress would result during the prestraining. Longitudinal strains in this zone were monitored during the prestraining and the subspecimens were cut from this region in a manner that did not allow the machining to appreciably affect the properties of the specimens. Following this, conventional tension and compression tests were performed on the subspecimens in various fluid pressure environments to determine the yield strengths for the cold-worked material in the direction of the principal axis of prestrain and the two transverse axes. These data are used to construct the three-dimensional subsequent yield surface which clearly illustrates the effects on 304 stainless steel, of cold working under pressure.

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