Effects of Prior Plasticity on Subsequent Creep of Type 316 Stainless Steel at Elevated Temperature

1986 ◽  
Vol 108 (1) ◽  
pp. 68-74 ◽  
Author(s):  
Y. Ohashi ◽  
M. Kawai ◽  
T. Momose
Keyword(s):  
Plastic Deformation ◽  
Stainless Steel ◽  
Creep Resistance ◽  
Tensile Direction ◽  
316 Stainless Steel ◽  
Plastic Prestraining ◽  
Axial Tensile ◽  
Thin Walled ◽  
Stress States ◽  
Tubular Specimens

Interaction between creep and plastic deformation was studied experimentally for type 316 stainless steel at 650°C, with special emphasis on creep behavior subsequent to plastic prestraining. In combined creep-plasticity experiments, thin-walled tubular specimens were first prestrained plastically in the axial tensile direction, and were subsequently subjected to constant stress creep under various multiaxial stress states with an identical effective stress. Furthermore, the variation in creep resistance due to the plastic prestrain was compared with that due to the same amount of creep prestrain. From the experimental results, it was found that creep resistance was markedly enhanced by the plastic prestrain and that the increase in the creep resistance depended on the amount and relative direction of the plastic prestrain. The creep resistance was increased more markedly by creep prestrain than the same amount of plastic strain.

Assessment of an Improved Multiaxial Strength Theory Based on Creep-Rupture Data for Type 316 Stainless Steel

1993 ◽  
Vol 115 (2) ◽  
pp. 177-184 ◽  
Author(s):  
R. L. Huddleston
Keyword(s):  
Stainless Steel ◽  
Stress Tensor ◽  
Rupture Life ◽  
Deviatoric Stress ◽  
Biaxial Stress ◽  
304 Stainless Steel ◽  
Strength Theory ◽  
Stress Rupture Life ◽  
316 Stainless Steel ◽  
Stress States

A new multiaxial strength theory incorporating three independent stress parameters was developed and reported by the author in 1984. It was formally incorporated into ASME Code Case N47-29 in 1990. In the earlier paper, the new model was shown to provide significantly more accurate stress-rupture life predictions than the classical theories of von Mises, Tresca, and Rankine, for type 304 stainless steel tested at 593°C under different biaxial stress states. Further assessments for other alloys are showing similar results. The current paper provides additional results for type 316 stainless steel specimens tested at 600°C under tension-tension and tension-compression stress states and shows 2–3 orders of magnitude reduction in the scatter in predicted versus observed lives. A key feature of the new theory, which incorporates the maximum deviatoric stress, the first invariant of the stress tensor, and the second invariant of the deviatoric stress tensor, is its ability to distinguish between life under tensile versus compressive stress states.

Creep Resistance of Additively Manufactured 316 Stainless Steel

2020 ◽  
Author(s):  
T. Byun ◽  
W. Chen ◽  
F. Heidet ◽  
M. Li ◽  
K. Terrani ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Creep Resistance ◽  
316 Stainless Steel

Plastic Deformation Behavior of Type 316 Stainless Steel Subject to Out-of-Phase Strain Cycles

1985 ◽  
Vol 107 (4) ◽  
pp. 286-292 ◽  
Author(s):  
Y. Ohashi ◽  
E. Tanaka ◽  
M. Ooka
Keyword(s):  
Stainless Steel ◽  
Kinematic Hardening ◽  
National Laboratory ◽  
Plastic Behavior ◽  
Hardening Model ◽  
Oak Ridge ◽  
316 Stainless Steel ◽  
Plastic Deformation Behavior ◽  
Series Of Experiments ◽  
Tubular Specimens

To elucidate the plastic behavior of metals under out-of-phase strain cycles, a series of experiments was performed on square strain trajectories in a vector space of deviatoric strain by applying combined axial force and torque to thin-walled tubular specimens of type 316 stainless steel. It was confirmed that strain hardening under out-of-phase cycles is much more significant than that under simple cycles. Though the combined isotropic-kinematic hardening model based on the concept of a nonhardening strain region proposed by Ohno gave qualitatively better predictions than the kinematic hardening model by Oak Ridge National Laboratory, there was still a considerable discrepancy between the former theory and the experiment.

Effect of Residual Stress and Microstructures on 316 Stainless Steel Treated by LSP

2017 ◽  
Vol 898 ◽  
pp. 1261-1265 ◽  
Author(s):  
Yu Qin Li ◽  
X.D. Wang ◽  
F.L. Song ◽  
Y. Jao ◽  
S.H. Luo
Keyword(s):  
Residual Stress ◽  
Plastic Deformation ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Stress Corrosion ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
316 Stainless Steel ◽  
Stress Corrosion Resistance ◽  
Shock Processing

In order to improve the stress corrosion resistance of 316 stainless steel, a new technology was proposed and studied. The 316 stainless steel sample was treated by laser shock processing (LSP). The residual stress and microstructures of 316 stainless steel with and without LSP were measured and compared by the methods of X-ray, transmission electron microscopy (TEM) and Electron Back-ScatteredDiffraction (EBSD), and the strengthening mechanism was discussed. It showed that the high residual compressive stress introduced by laser shock processing was about-112 MPa. The TEM and EBSD results showed that severe plastic deformation and nanocrystals layer were formed by LSP, and the orientation of the grains had evident rotation in the process of plastic deformation. These helped to enhance the stress corrosion resistance of 316 stainless steel.

Creep Resistance of Additively Manufactured 316 Stainless Steel

2020 ◽  
Author(s):  
T. Byun ◽  
W. Chen ◽  
F. Heidet ◽  
M. Li ◽  
K. Terrani ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Creep Resistance ◽  
316 Stainless Steel

Effects of Prior Creep on Subsequent Plasticity of Type 316 Stainless Steel at Elevated Temperature

1983 ◽  
Vol 105 (4) ◽  
pp. 257-263 ◽  
Author(s):  
Y. Ohashi ◽  
M. Kawai ◽  
H. Shimizu
Keyword(s):  
Plastic Deformation ◽  
Stainless Steel ◽  
Elevated Temperature ◽  
Experimental Results ◽  
Marked Influence ◽  
316 Stainless Steel ◽  
History Effects ◽  
Axial Tension ◽  
The One ◽  
Deformation Tests

History effects of prior creep on subsequent plasticity were studied for type 316 stainless steel at 600°C under combined torsion and tension. Following each of three different amounts of prior torsional creep, plastic deformation tests were performed under torsions in the same and opposite directions of the prior creep and axial tension, respectively. The experimental results showed the marked influence of prior creep on subsequent plasticity. That is, the flow stress in the subsequent plastic deformation after creep became larger than the one in the corresponding pure plastic test where the prior creep strain in the combined creep-plasticity test was replaced by a plastic strain of the same amount. Finally, predictions by means of existing separated and unified constitutive equations were discussed on the basis of the experimental results.

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