Thermo-mechanical cyclic hardening behavior of 304 stainless steel at large temperature ranges: Experiments and simulations

2018 ◽  
Vol 146-147 ◽  
pp. 517-526 ◽  
Author(s):  
Nobutada Ohno ◽  
Ryohei Yamamoto ◽  
Dai Okumura
Keyword(s):  
Stainless Steel ◽  
Cyclic Hardening ◽  
304 Stainless Steel ◽  
Large Temperature ◽  
Hardening Behavior ◽  
Temperature Ranges

Thermo-Mechanical Cyclic Plastic Behavior of 304 Stainless Steel at Large Temperature Ranges

2016 ◽  
Vol 725 ◽  
pp. 275-280
Author(s):  
Nobutada Ohno ◽  
Ryohei Yamamoto ◽  
Dai Okumura
Keyword(s):  
Stainless Steel ◽  
Cyclic Loading ◽  
Cyclic Hardening ◽  
Cyclic Behavior ◽  
304 Stainless Steel ◽  
Maximum Temperature ◽  
Plastic Behavior ◽  
Temperature Ranges ◽  
Hardening Parameter ◽  
Maximum Temperatures

Thermo-mechanical cyclic experiments on 304 stainless steel were performed at several temperature ranges which had maximum temperatures ranging from 350°C to 1000°C and a minimum temperature of 150 °C. Related isothermal cyclic experiments were also performed. Temperature-history dependent cyclic hardening significantly occurred under thermo-mechanical cyclic loading with maximum temperatures around 600°C, whereas almost no cyclic hardening was observed when the maximum temperature was 1000°C. The observed thermo-mechanical cyclic plastic behavior in the saturated state of cyclic hardening was then simulated using a cyclic viscoplastic constitutive model, leading to the following findings. It was difficult to predict the saturated thermo-mechanical cyclic behavior using only the isothermal cyclic experimental data. The saturated thermo-mechanical cyclic behavior was simulated well by introducing a cyclic hardening parameter depending on the maximum temperature. This means that the cyclic hardening parameter should not change with temperature but depend on the maximum temperature in the saturated state of cyclic hardening under thermo-mechanical cyclic loading.

An Investigation of Cyclic Transient Behavior and Implications on Fatigue Life Estimates

1997 ◽  
Vol 119 (2) ◽  
pp. 161-170 ◽  
Author(s):  
Yanyao Jiang ◽  
Peter Kurath
Keyword(s):  
Stainless Steel ◽  
Fatigue Life ◽  
Cyclic Hardening ◽  
Transient Behavior ◽  
Fatigue Tests ◽  
304 Stainless Steel ◽  
Deformation History ◽  
Life Estimation ◽  
Fatigue Life Estimation ◽  
Track Deformation

Current research focuses on proportional cyclic hardening and non-Massing behaviors. The interaction of these two hardenings can result in the traditionally observed overall softening, hardening or mixed behavior exhibited for fully reversed strain controlled fatigue tests. Proportional experiments were conducted with five materials, 304 stainless steel, normalized 1070 and 1045 steels, and 7075-T6 and 6061-T6 aluminum alloys. All the materials display similar trends, but the 304 stainless steel shows the most pronounced transient behavior and will be discussed in detail. Existing algorithms for this behavior are evaluated in light of the recent experiments, and refinements to the Armstrong-Frederick class of incremental plasticity models are proposed. Modifications implemented are more extensive than the traditional variation of yield stress, and a traditional strain based memory surface is utilized to track deformation history. Implications of the deformation characteristics with regard to fatigue life estimation, especially variable amplitude loading, will be examined. The high-low step loading is utilized to illustrate the effect of transient deformation on fatigue life estimation procedures, and their relationship to the observed and modeled deformation.

Nonproportional Low Cycle Fatigue Criterion for Type 304 Stainless Steel

1995 ◽  
Vol 117 (3) ◽  
pp. 285-292 ◽  
Author(s):  
Takamoto Itoh ◽  
Masao Sakane ◽  
Masateru Ohnami ◽  
Darrell F. Socie
Keyword(s):  
Stainless Steel ◽  
Low Cycle Fatigue ◽  
Cyclic Hardening ◽  
304 Stainless Steel ◽  
Cycle Fatigue ◽  
Nonproportional Loading ◽  
Loading Tests ◽  
Strain Paths ◽  
Type 304 ◽  
Type 304 Stainless Steel

This paper describes a multiaxial low cycle fatigue parameter for correlating Hues under nonproportional loadings. Constant amplitude low cycle fatigue tests were carried out under 14 proportional and complex nonproportional cyclic strain paths using type 304 stainless steel hollow cylinder specimens at room temperature. In nonproportional loading tests, fatigue lives are decreased by as much as a factor of 10 in comparison with those in proportional loading tests with the same strain range. Reduction in fatigue life due to nonproportional loading is closely related to additional nonproportional cyclic hardening. The product of the maximum principal stress and strain ranges correlated the nonproportional fatigue data. A nonproportional cyclic hardening parameter computed from the strain path is also proposed that allows life estimates to be obtained directly from the strain history without the need for a cyclic plasticity model.

Effect of Temperature Variation on Cyclic Elastic-Plastic Behavior of SUS 304 Stainless Steel

1990 ◽  
Vol 112 (2) ◽  
pp. 152-157 ◽  
Author(s):  
Y. Niitsu ◽  
K. Ikegami
Keyword(s):  
Stainless Steel ◽  
Temperature Variation ◽  
Cyclic Hardening ◽  
Experimental Results ◽  
304 Stainless Steel ◽  
Effect Of Temperature ◽  
Plastic Behavior ◽  
Elastic Plastic ◽  
Temperature Conditions ◽  
Hardening Models

The cyclic elastic-plastic behavior of SUS 304 stainless steel was investigated experimentally under various temperatures and temperature-changing conditions. The specimens were cyclically loaded between fixed axial strain limits at constant temperatures in the range from room temperature to 600°C. The effects of the cyclic strain amplitude on the saturation property of cyclic hardening were obtained at various temperatures. The effects of temperature variations on the cyclic hardening were examined under the temperature conditions of changing between two different temperatures. From these experimental results, the effects of the temperature variation on the saturation properties were found under several temperature conditions. The three different hardening models accounting for these cyclic hardening properties were proposed. The experimental results were compared with the results calculated by those three cyclic hardening models.

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