Low Cycle Fatigue Properties of Alloy 617 base Metal and Weld Joint at Room Temperature

Choi, Piljoo; Dewa, Rando Tungga; Kim, Woo‐Gon; Kim, Min-Hwan

doi:10.1016/j.mspro.2014.06.356

Cited by 17 publications

(12 citation statements)

References 10 publications

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“…Therefore, Figure 7 shows the ratio of cyclic hardening measured by the ratio of the maximum stress amplitude (σ peak ) to the stress amplitude of the first cycle (σ initial ). From the figure, it is obvious that the ratio of cyclic hardening increases along with the transformation of LCF test environment from previous work [4,5] at room temperature to the present investigation at 800˝C. As in the literature survey [11], they also acknowledged that the DSA occurs in the temperature range of about 650-900˝C for this Alloy 617.…”

Section: Low Cycle Fatigue Behaviors Of Alloy 617 Weldmentssupporting

confidence: 62%

“…Nowadays, the Korea Atomic Energy Research Institute (KAERI) is developing a nuclear hydrogen development and demonstration plant with a capacity of 200 MW th with thermal and core outlet temperature of 950˝C [1,2,4,5]. The components have a projected plant design service life of 40-60 years operation and 3-8 MPa in He impurities.…”

Section: Introductionmentioning

confidence: 99%

“…The components have a projected plant design service life of 40-60 years operation and 3-8 MPa in He impurities. The most important consideration is the creep-fatigue and fatigue behavior of the materials, especially in welded structure [3][4][5]. The Alloy 617 for the IHX and other components is expected to operate at room temperature, which is assumed as a start-up condition, and at temperatures between 800-950˝C.…”

Section: Introductionmentioning

confidence: 99%

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Low Cycle Fatigue Behaviors of Alloy 617 (INCONEL 617) Weldments for High Temperature Applications

Dewa

Kim

et al. 2016

Metals

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Abstract:In this study, we comparatively investigate the low cycle fatigue behavior of Alloy 617 (INCONEL 617) weldments by gas tungsten arc welding process at room temperature and 800˝C in the air to support the qualification in high temperature applications of the Next Generation-IV Nuclear Plant. Axial total-strain controlled tests have been performed with the magnitude of strain ranges with a constant strain ratio (R ε =´1). The results of fatigue tests consistently show lower fatigue life with an increase in total strain range and temperature at all testing conditions. The reduction in fatigue life may result from the higher cyclic plastic strain accumulation and the material ductility at high temperature conditions. A constitutive behavior of high temperature by some cyclic hardening was observed. The occurrence of serrated yielding in the cyclic stress response was also observed, suggesting the influence of dynamic strain aging during high temperature. We evaluated a well-known life prediction model through the Coffin-Manson relationship. The results are well matched with the experimental data. In addition, low cycle fatigue cracking occurred in the weld metal region and initiated transgranularly at the free surface.

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Section: Low Cycle Fatigue Behaviors Of Alloy 617 Weldmentssupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Low Cycle Fatigue Behaviors of Alloy 617 (INCONEL 617) Weldments for High Temperature Applications

Dewa

Kim

et al. 2016

Metals

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“…It is well known that the strain-based approach can better characterize the fatigue behavior in the low-cycle region of a material than the stress-based approach [15,16]. The first procedure in the strain-based approach is to obtain the cyclic stress-strain curve of the specified material.…”

Section: Strain-based Approachmentioning

confidence: 99%

Effect of Cryogenic Temperature on Low-Cycle Fatigue Behavior of AISI 304L Welded Joint

Song

Kim

et al. 2018

Metals

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Abstract:The aim of this study is to investigate the low-cycle fatigue (LCF) properties of an AISI 304L welded joint based on experimental data. The influential parameters on the LCF such as the specimen thickness, strain ratio and cryogenic temperature were considered in this experimental study. In order to investigate the thickness effect on the LCF behavior, two types of specimens with thicknesses of 5 mm and 10 mm were used in an LCF test. In addition, the fatigue tests were conducted under strain control with three different strain ratios of R = −1, 0, and 0.5 at room and cryogenic temperatures. Based on the results obtained by this experimental study, no significant effect involved with the thickness and the strain ratio were observed. However, it was clearly observed that LCF performance at room temperature is lower than that at cryogenic temperature. Finally, an LCF design curve that can be used in design of the liquefied natural gas (LNG) applications is suggested.

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“…Hence, welded joints are generally considered as the weak regions in the engineering structures. During the service time, the welded structures will unavoidably experience cyclic loadings from the equipment start-up and shut-down process as well as different kinds of dynamic loadings [3,4]. Increased understanding of the cyclic plastic deformation and low cycle fatigue behavior of welded joints is of great importance for the life prediction and safety design of the welded structures.…”

Section: Introductionmentioning

confidence: 99%

A comparative study on the cyclic plasticity and fatigue failure behavior of different subzones in CrNiMoV steel welded joint

Guo

Wang

Chen³

et al. 2019

International Journal of Mechanical Sciences

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The cyclic plasticity and the low cycle fatigue failure behavior of the weld metal (WM) and base metal (BM) of the CrNiMoV steel welded joint under the strain and stress-control modes were investigated respectively. Significant cyclic softening was observed for both the WM and BM under the low cycle fatigue tests with the two control modes. Besides, obvious ratcheting happened in the WM and BM under the stress-controlled cyclic loading conditions. It is shown that both the WM and BM exhibited lower fatigue strength at the stress control mode than that at the strain control mode due to the influence of tension-compression asymmetry. Meanwhile, the WM showed larger cyclic softening rate, lower ratchetting deformation and fatigue strength than the BM under the same loading levels. The failure location of the WM specimens shifted from BM region (nearby the heat affected zone) to the center of WM with the increasing of strain amplitude under the strain-controlled tests, which can be explained with the similar maximum equivalent plastic strain amplitude location shifting behavior observed from the corresponding finite element simulations.

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Low Cycle Fatigue Properties of Alloy 617 base Metal and Weld Joint at Room Temperature

Cited by 17 publications

References 10 publications

Low Cycle Fatigue Behaviors of Alloy 617 (INCONEL 617) Weldments for High Temperature Applications

Low Cycle Fatigue Behaviors of Alloy 617 (INCONEL 617) Weldments for High Temperature Applications

Effect of Cryogenic Temperature on Low-Cycle Fatigue Behavior of AISI 304L Welded Joint

A comparative study on the cyclic plasticity and fatigue failure behavior of different subzones in CrNiMoV steel welded joint

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