Low-cycle fatigue behaviors of a new type of 10% Cr martensitic steel and welded joint with Ni-based weld metal

Zhang, Qunbing; Zhang, Jianxun; Zhao, Pengfei; Huang, Yuanyuan; Yu, Zhou; Fang, Xiuyang

doi:10.1016/j.ijfatigue.2016.03.003

Cited by 42 publications

(24 citation statements)

References 43 publications

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“…The occurrence of fatigue striations was due to a repeated plastic blunting sharpening process arising from the slip of dislocations in the plastic zone of the fatigue crack tip [12]. However, the weldments could easily form fatigue striations and undergo quasi-cleavage facets due to their higher stress-strain interaction and being more brittle than that of the base metal [13]. Figure 14 shows typical micrographs of the Alloy 617 base metal crack initiation site.…”

Section: Failure Location Propagation Regionmentioning

confidence: 99%

Understanding Low Cycle Fatigue Behavior of Alloy 617 Base Metal and Weldments at 900 °C

Dewa

Kim

et al. 2016

Metals

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Abstract:In order to better understand the high temperature low cycle fatigue behavior of Alloy 617 weldments, this work focuses on the comparative study of the low cycle fatigue behavior of Alloy 617 base metal and weldments, made from automated gas tungsten arc welding with Alloy 617 filler wire. Low cycle fatigue tests were carried out by a series of fully reversed strain-controls (strain ratio, R ε =´1), i.e., 0.6%, 0.9%, 1.2% and 1.5% at a high temperature of 900˝C and a constant strain rate of 10´3/s. At all the testing conditions, the weldment specimens showed lower fatigue lives compared with the base metal due to their microstructural heterogeneities. The effect of very high temperature deformation behavior regarding cyclic stress response varied as a complex function of material property and total strain range. The Alloy 617 base weldments showed some cyclic hardening as a function of total strain range. However, the Alloy 617 base metal showed some cyclic softening induced by solute drag creep during low cycle fatigue. An analysis of the low cycle fatigue data based on a Coffin-Manson relationship was carried out. Fracture surface characterizations were performed on selected fractured specimens using standard metallographic techniques.

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Section: Failure Location Propagation Regionmentioning

confidence: 99%

Understanding Low Cycle Fatigue Behavior of Alloy 617 Base Metal and Weldments at 900 °C

Dewa

Kim

et al. 2016

Metals

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“…As a consequence, the corresponding cyclic stress-strain response obtained from each WM specimen was taken as that of the welded metal in this paper. The similar situation and handling method also existed in the research works carried out by Cheng et al [2], Wang et al [5], and Zhang et al [20].…”

Section: The Cyclic Loading Testsmentioning

confidence: 53%

“…The strain-controlled low cycle fatigue (LCF) and the stress-controlled ratcheting are the major cyclic deformation phenomena under cyclic loadings [5]. In the last several decades, extensively research works on the strain-controlled LCF behavior of welded joints have been published [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Taking the joints as bulk material, the cyclic hardening/softening features and the fatigue strength of several homogenous welded joints (with base metal of Ti6Al4V [6], 9-12% Cr steel [7][8], 7075Al alloy [9], Ni based alloy 617 [4], etc.)…”

Section: Introductionmentioning

confidence: 99%

“…It is shown in most works that the welded joints exhibit lower fatigue strength than that of the base metal due to the heterogeneity and welding defects [15,16]. Further, in the consideration of the heterogeneity of welded joints, the strain-controlled LCF tests of the individual zones, such as the of BM, WM and HAZ materials have been carried out for different welded joints [2,[17][18][19][20]. For example, Cheng et al [2] and Chen et al [18] investigated the cyclic deformation phenomenon and fatigue lives of the BM, WM and HAZ for the 16MnR and coke drum welded joints, respectively.…”

Section: Introductionmentioning

confidence: 99%

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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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“…ULCF failure is caused by the ductile failure of steel under high strain cyclic load after a cyclic plastic deformation of less than 100 cycles, and the fracture mechanism is ductile failure [8][9][10][11][12]. The fracture mechanism of steel with ULCF is different from that of LCF [13,14]. Thus, the damage prediction method suitable for LCF cannot be directly applied to ULCF.…”

Section: Introductionmentioning

confidence: 99%

Study on the Prediction Method of the Ultra-Low-Cycle Fatigue Damage of Steel

et al. 2020

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Cyclic void growth model (CVGM) and continuum damage mechanics (CDM) model are suitable for predicting the damage of ultra-low-cycle fatigue (ULCF) theoretically. However, studies on the prediction of ultra-low-cycle fatigue (ULCF) damage is lacking. To determine which method is better, we used the two methods to predict the damage of ULCF. Firstly, uniaxial tensile and large strain cycle tests were performed on the base metal, weld metal and heat-affected zone and the material parameters were calibrated respectively. The uniaxial plastic strain threshold and toughness parameter of weld metal were minimum, and the dispersion was maximum. The finite element models of the base metal and weld specimens were established based on the calibrated parameters, and the ULCF damage was predicted. Compared with the CVGM model, the CDM model can predict the fatigue life and the relationships among the fatigue and fracture lives, the post-fracture path and the number of cycles to initial damage. The parameter calibration is simple. CDM is superior to CVGM in predicting the ULCF damage of steel and its weld joints.

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Low-cycle fatigue behaviors of a new type of 10% Cr martensitic steel and welded joint with Ni-based weld metal

Cited by 42 publications

References 43 publications

Understanding Low Cycle Fatigue Behavior of Alloy 617 Base Metal and Weldments at 900 °C

Understanding Low Cycle Fatigue Behavior of Alloy 617 Base Metal and Weldments at 900 °C

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

Study on the Prediction Method of the Ultra-Low-Cycle Fatigue Damage of Steel

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