Dislocation structure evolution in 304L stainless steel and weld joint during cyclic plastic deformation

Wang, Hao; Jing, Hongyang; Zhao, Lei; Han, Yongdian; Lv, Xiaoqing; Xu, Lianyong

doi:10.1016/j.msea.2017.02.090

Cited by 64 publications

(14 citation statements)

References 61 publications

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“…As shown in Figure A,B, a large number of dislocation lines were tangled, indicating a high dislocation density for virgin material, which is consistent with the result in Figure A. The dislocation channel, which has a low dislocation density and dislocation walls formed by dislocation tangles, can form the dislocation cells in Figure A . In addition to the dislocation tangles, some dislocation lines and interactions between dislocations and precipitates with different sizes are presented in Figure B.…”

Section: Resultssupporting

confidence: 83%

“…The dislocation channel, which has a low dislocation density and dislocation walls formed by dislocation tangles, can form the dislocation cells in Figure 11A. 43 In addition to the dislocation tangles, some dislocation lines and interactions between dislocations and precipitates with different sizes are presented in Figure 11B. It is known that the G115 steel contains several kinds of precipitate, such as MX, M 23 C 6 , Cu-rich, and Laves phase, after heat treatment or high-temperature testing.…”

Section: Comparisons Of the Dislocation Structures And Precipitatesmentioning

confidence: 99%

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Stress state and stress‐induced microstructural evolution around the crack tip of G115 steel after dwell‐fatigue crack propagation

Tang

Jing

Zhao

et al. 2019

Fatigue Fract Eng Mat Struct

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Many components operate under creep‐fatigue loading causing an increasing need to learn the knowledge about creep‐fatigue crack growth (CFCG). The stress and microstructural evolution around the crack tip of G115 steel after CFCG were investigated. According to the finite element simulations, the variations of equivalent stress and stress triaxiality in the crack tip zone are presented. Furthermore, the evolutions of martensitic laths, dislocations, and precipitates were systematically studied through electron backscatter diffraction and transmission electron microscopy observations. The laths at the crack tip or under a larger hold time are wider than those remote from the crack tip or under a shorter dwell time. Meanwhile, the dislocation densities reduced significantly at the crack tip or under a larger hold time. The different variations of laths' width and dislocation densities resulted from the different stress triaxiality and creep strain. W‐rich Laves and Cu‐rich phases appeared during CFCG. The Laves phase coarsened rapidly because of the stress‐accelerated diffusion.

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Section: Resultssupporting

confidence: 83%

Section: Comparisons Of the Dislocation Structures And Precipitatesmentioning

confidence: 99%

Stress state and stress‐induced microstructural evolution around the crack tip of G115 steel after dwell‐fatigue crack propagation

Tang

Jing

Zhao

et al. 2019

Fatigue Fract Eng Mat Struct

Self Cite

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“…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].…”

Section: Introductionmentioning

confidence: 99%

“…It is desirable to study the ratcheting behavior of welded joints and to explore the difference of the cyclic deformation and fatigue features for welded joints under the stress and strain control modes [22]. For the stress-controlled ratcheting behavior of welded joints, Wang et al [5,26] conducted a series of tests for the 304L base metal and ER308L weld metal of the 304L stainless steel welded joint under the stress cycles with various magnitudes of mean stress, in which the BM and WM showed cyclic hardening and cyclic softening ratchetting strain evolution process, respectively. Nevertheless, limited research works were reported in the past on the ratchetting test and its contribution to the fatigue life for the welded joints, the comparative study on the cyclic deformation and fatigue behavior of welded joints under the stress and strain control modes has not been examined in literature.…”

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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“…It should be pointed out that damage accumulation has such an important impact on the performance and service life of structure [14][15][16][17][18][19], and even several studies have focused on the damage detection of the construction structure and material [20][21][22][23][24], but there is little consideration of the weld damage accumulation in the study of seismic performance of steel tubular truss structure joints [25][26][27][28], and the difference of the constitutive relation between the welding material and base metal is often neglected. For instance, the research results of Wang [29] revealed that the welding material and its parent material of 304 L steel have different hardening laws and damage evolution laws under cyclic loading. In addition, the size and shape of the yield surface of material will change continuously under cyclic loading, which is quite different from the constitutive behavior under a monotonic load.…”

Section: Introductionmentioning

confidence: 99%

Study on Hysteresis Model of Welding Material in Unstiffened Welded Joints of Steel Tubular Truss Structure

2018

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The weld form of intersecting joints in a steel tubular truss structure changes with the various intersecting curves. As the key role of joints in energy dissipation and seismic resistance, the weld is easy to damage, as a result the constitutive behavior of the weld is different from that of the base metal. In order to define the cumulative damage characteristic and study the constitutive behavior of welded metal with the influence of damage accumulation, low-cycle fatigue tests were carried out to evaluate overall response characteristics and to quantify variation of cyclic stress amplitude, unloading stiffness and energy dissipation capacity. The results show that the cyclic softening behavior of welding materials is apparent, however, the steel shows hardening behavior with the increase of cyclic cycles, while the cyclic stress amplitude, unloading stiffness, and energy dissipation capacity of the welding materials degenerate gradually. Based on the Ramberg–Osgood model and introducing the damage variable D, a hysteretic model of welding material with the effect of damage accumulation was established, including an initial loading curve, cyclic stress-strain curve, and hysteretic curve model. Further, the evolution equation of D was also built. The parameters reflecting the damage degradation were fitted by the test data, and the simulation results of the model were proved to be in good agreement with the test results.

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Dislocation structure evolution in 304L stainless steel and weld joint during cyclic plastic deformation

Cited by 64 publications

References 61 publications

Stress state and stress‐induced microstructural evolution around the crack tip of G115 steel after dwell‐fatigue crack propagation

Stress state and stress‐induced microstructural evolution around the crack tip of G115 steel after dwell‐fatigue crack propagation

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

Study on Hysteresis Model of Welding Material in Unstiffened Welded Joints of Steel Tubular Truss Structure

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