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.

Capability of a Feed-Forward Artificial Neural Network to Predict the Constitutive Flow Behavior of As Cast 304 Stainless Steel Under Hot Deformation

2006 ◽  
Vol 129 (2) ◽  
pp. 242-247 ◽  
Author(s):  
Sumantra Mandal ◽  
P. V. Sivaprasad ◽  
S. Venugopal
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Stainless Steel ◽  
Strain Rate ◽  
Hot Deformation ◽  
Flow Behavior ◽  
304 Stainless Steel ◽  
Compression Tests ◽  
Feed Forward ◽  
Artificial Neural

A model is developed to predict the constitutive flow behavior of as cast 304 stainless steel during hot deformation using artificial neural network (ANN). The inputs of the neural network are strain, strain rate, and temperature, whereas flow stress is the output. Experimental data obtained from hot compression tests in the temperature range 1023-1523K, strain range 0.1-0.5, and strain rate range 10−3-102s−1 are employed to develop the model. A three-layer feed-forward ANN is trained with standard back propagation and some upgraded algorithms like resilient propagation (Rprop) and superSAB. The performances of these algorithms are evaluated using a wide variety of standard statistical indices. The results of this study show that Rprop algorithm performs better as compared to others and thereby considered as the most efficient algorithm for the present study. It has been shown that the developed ANN model can efficiently and accurately predict the hot deformation behavior of as cast 304 stainless steel. Finally, an attempt has been made to quantify the extrapolation ability of the developed network.

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

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.

scholarly journals Three-Dimensional (3D) Microstructure-Based Modeling of a Thermally-Aged Cast Duplex Stainless Steel Based on X-ray Microtomography, Nanoindentation and Micropillar Compression

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 688
Author(s):  
Qingdong Zhang ◽  
Kai Zhu ◽  
Arun Sundar S. Singaravelu ◽  
Weizhao Sun ◽  
Tao Jing ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Three Dimensional ◽  
Compression Tests ◽  
Element Analysis ◽  
X Ray ◽  
3D Microstructure ◽  
Individual Phase ◽  
Micropillar Compression

Finite element analysis was conducted on a thermally-aged cast duplex stainless steel based on the true three-dimensional (3D) microstructure obtained from X-ray microtomography experiments and using the constitutive behavior of each individual phase extracted from nanoindentation on single-crystal and bicrystal micropillar compression tests. The evolution of the phase morphology, the mechanical properties and the boundary deformation behavior during the aging process are highlighted. Quantitative analysis in terms of the distribution and evolution of the stress and strain in both the as received and aged conditions was performed. The experimental results show that aging at an intermediate temperature has a negligible influence on the morphology of the two phases in cast duplex stainless steel (CDSS). Results from simulations reveal that the mechanical behavior of this material were seriously affected by the microstructure and the mechanical properties of the individual phase and the necking deformation tend to form in the area with less large ferrite grains after aging. In addition, stress localization tends to form at the austenite/ferrite interface, in the narrow region of ferrite grains and in the small ferrite grains.

Ambient Temperature Creep of Type 304 Stainless Steel

2011 ◽  
Vol 133 (2) ◽  
Author(s):  
M. E. Kassner ◽  
P. Geantil ◽  
R. S. Rosen
Keyword(s):  
Stainless Steel ◽  
Ambient Temperature ◽  
Cold Working ◽  
Rate Sensitivity ◽  
304 Stainless Steel ◽  
Creep Equation ◽  
Temperature Creep ◽  
Type 304 ◽  
Type 304 Stainless Steel ◽  
High Strain Rate Sensitivity

This study reports the significant ambient temperature creep plasticity at stresses below the conventional 0.2% plastic strain off-set yield stress. This is partially due to the relatively high strain-rate sensitivity of 304 stainless steel. Cold-working significantly increases the creep resistance. Descriptive equations that predict low-stress creep plasticity, which are somewhat different than traditional creep-equation forms, are presented.

Prediction of Welding Distortion in 304 Stainless Steel

2011 ◽  
Vol 137 ◽  
pp. 419-423 ◽  
Author(s):  
Dong Feng Li ◽  
Rui Wang ◽  
Xin Li Han ◽  
Peng Yang ◽  
Jun Han ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Thin Plate ◽  
Material Properties ◽  
Heat Input ◽  
Three Dimensional ◽  
304 Stainless Steel ◽  
Welding Distortion ◽  
Welding Heat Input ◽  
Large Distortion ◽  
Small Distortion

Prediction of welding distortion of stainless steel welding joint in reasonable time is meaningful in welding industry. In this paper, a three dimensional thermo-elastic-plastic finite element method (FEM) is developed to precisely predict welding distortion on bead on plate welding with 304 stainless steel. Meanwhile, the corresponding experiments are carried out to validate the predicted results. Research results show the predicted results by FEM match the experimental results very well. In the condition of different welding heat input, the welding heat input play an important role on welding distortion. While, material properties of stainless steel play a larger role on welding distortion when welding heat input is same. Further, for bead on plate welding of thin plate, both large distortion theory and small distortion theory are computed. The results show that using large distortion theory is more accurate in prediction welding distortion on thin plate welding.

Application of the Hybrid Constitutive Model for Cyclic Plasticity to Sinusoidal Loading

1992 ◽  
Vol 114 (2) ◽  
pp. 172-179 ◽  
Author(s):  
H. Ishikawa ◽  
K. Sasaki
Keyword(s):  
Constitutive Model ◽  
Yield Surface ◽  
Strain Path ◽  
Good Description ◽  
Yield Function ◽  
Cyclic Plasticity ◽  
304 Stainless Steel ◽  
Subsequent Yield Surface ◽  
Type 304 ◽  
Type 304 Stainless Steel

In order to study the applicability of the proposed hybrid constitutive model for cyclic plasticity to nonproportional loading, type 304 stainless-steel specimens subjected to sinusoidal loading that could change the degree of nonproportionality of the strain path were examined in detail. The subsequent yield surface during the loading was discussed in advance because the plastic deformation induced anisotropy coefficient tensor in the yield function had to be determined from the yield surface obtained by the experiment. From the experimental results, the subsequent yield surfaces during the loading could be assumed to be of the quadratic form of stress. The simulations based on the model gave a good description of the sinusoidal loading, irrespective of the degree of nonproportionality of the strain path.

Sign in / Sign up

Export Citation Format

Share Document