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.

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.

Creep After Cyclic-Plasticity Under Multiaxial Conditions for Type 316 Stainless Steel at Elevated Temperature

1990 ◽  
Vol 112 (3) ◽  
pp. 346-352 ◽  
Author(s):  
S. Murakami ◽  
M. Kawai ◽  
Y. Yamada
Keyword(s):  
Stainless Steel ◽  
Uniaxial Tension ◽  
Flow Direction ◽  
Cyclic Plasticity ◽  
Total Strain Amplitude ◽  
316 Stainless Steel ◽  
Creep Flow ◽  
History Effects ◽  
Simple Tension ◽  
Strain Paths

History effects of cyclic-plasticity on subsequent creep have been elucidated for type 316 stainless steel at 600°C under multiaxial states of stress. Tension-compression and circular strain paths were specified for the prior cyclic plasticity. Constant stress creep experiments under simple tension, simple torsion, and combined tensiontorsion were first performed after uniaxial tension-compression cycles stabilized under a constant total strain amplitude. Then, in order to elucidate the path shape effects of prior strain cycles, the subsequent creep curves under uniaxial tension were compared for the uniaxial tension-compression and the non-proportional circular strain cycles which stabilized at identical stress amplitudes. The experimental results showed that the prior tension-compression cycles induced the anisotropy in creep behavior; creep resistance which was initially isotropic was enhanced in torsional direction, while it was decreased in tensile one. Another significant observation was that the circular strain cycles showed much larger hardening effect on creep than the tension-compression cycle. Regarding the creep flow direction, the effect of the prior cycles was negligible.

Prediction of the Flow Stress of 00Cr17Ni14Mo2 Steel during Hot Deformation

2011 ◽  
Vol 460-461 ◽  
pp. 802-805
Author(s):  
Nan Hai Hao ◽  
Shao Wei Pan
Keyword(s):  
Stainless Steel ◽  
Elevated Temperature ◽  
Flow Stress ◽  
Hot Deformation ◽  
Flow Behavior ◽  
Strain Rates ◽  
Forming Process ◽  
Proposed Model ◽  
316L Austenitic Stainless Steel ◽  
Deformation Tests

The knowledge of the flow behavior of metals during hot deformation is of great importance in determining the optimum forming conditions. In this paper, the flow stress of 00Cr17Ni14Mo2 (ANSI 316L) austenitic stainless steel in elevated temperature is measured with compression deformation tests. The temperatures at which the steel is compressed are 800-1100°C with strain rates of 0.01-1s-1. A mathematical regression model is proposed to describe the flow stress and the validation of the model is conducted also. The proposed model can be used to predict the corresponding flow stress-strain response of 00Cr17Ni14Mo2 stainless steel in elevated temperature for the numerical simulation and design of forming process.

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