Planar dislocation structure during creep-fatigue interactions of TP347H heat-resistant austenitic steel at 600 °C

Zhou, Hongwei; Zhang, Hongyan; Bai, Fengmei; Song, Meng; Chen, Yan; Zhang, Liqiang; Fang, Xudong; He, Yizhu

doi:10.1016/j.msea.2020.139141

Cited by 17 publications

(11 citation statements)

References 37 publications

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“…In our previous research work 9 , it was found that the PSBs and cellar structures coexist in Nb-bearing ASS during LCF. Nb, as an important alloy element in new austenitic heat-resistant steel can easily form NbX (X=C,N) particles during high temperature aging or deformation 9,22 , which plays a role for precipitation strengthening. Meanwhile, the strong binding force between Nb and C reduces the precipitation of M 23 C 6 at grain boundary.…”

Section: Introductionmentioning

confidence: 88%

“…Figures 5-6 show the highly non-uniform distribution of PSBs and cell structures, indicating high strain localization in the fatigue samples. The regions of cells 21 and PSBs zone 9,37 are easy to result in fatigue crack initiation.…”

Section: Gnd Density and The Size Of Dislocation Microstructuresmentioning

confidence: 99%

“…The main factors which influence the slip modes are alloying elements and content, stacking fault energy, deformation temperature and deformation strain rate. According to the previous literature reports [2][3][4][7][8][9][10] , cells and planar structures are mainly formed by dislocation cross slip and dislocation planar slip respectively.…”

Section: Introductionmentioning

confidence: 95%

“…Austenitic stainless steels (ASS) exhibit complex dislocation structures under fatigue, creep, and creep-fatigue interaction condition, which are mainly the cellular structure [1][2][3][4] , channel/wall structure, persistent slip bands 5,6 , vein/labyrinth dislocation structures 7 , ladder structure 8 , planar slip bands 9 , the corduroy structure 10 . There are two main slip modes of dislocation in ASS under plastic deformation known as the cross slip and the planar slip.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Characterization of Dislocation Structure in a Nb-bearing Austenitic Stainless Steel After Low Cycle Fatigue via TEM and EBSD

Fang

Wei

et al. 2022

Mat. Res.

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In this paper, the relationship between Kernel average misorientation (KAM), geometrically necessary dislocation (GND) density and dislocation structures of Nb-bearing austenitic stainless steel under low cycle fatigue (LCF) was studied at 600°C at the total strain amplitude ranged from 0.3% to 1.0%. The results based on EBSD analysis show that the GND density in fatigue specimens gradually increases with the increase of strain amplitude. Under LCF loading, the dislocation structures are mainly planar slip bands (PSBs) and the cell structures. With the increase of strain amplitude, the number of PSBs increases with decrease in width, and the average diameter of cells also decreases. The PSBs originate due to the dynamic strain aging (DSA) effect, and DSA is more significant under high strain amplitude. The average diameter of cell structures has a specific relationship with GND density.

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Section: Introductionmentioning

confidence: 88%

Section: Gnd Density and The Size Of Dislocation Microstructuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterization of Dislocation Structure in a Nb-bearing Austenitic Stainless Steel After Low Cycle Fatigue via TEM and EBSD

Fang

Wei

et al. 2022

Mat. Res.

Self Cite

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“…Alsmadi et al [ 55 ] proposed that crack cavities along grain boundary and transgranular fatigue cracks accelerate the crack growth rate and decrease the time of crack initiation. Zhou et al [ 56 ] investigated that dislocation pills up in planer slip bands zone and leads to form stress concentration adjacent to grain boundary and cavities at grain boundary. In addition, the interaction of plan slip band‐grain boundary and plan slip band–twin boundary also forms cavities and crack initiation at grain boundary in TP347H.…”

Section: Properties At Elevated Temperaturesmentioning

confidence: 99%

Precipitation and Properties at Elevated Temperature in Austenitic Heat‐Resistant Steels—A Review

Wang

Wei

et al. 2020

steel research int.

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The austenitic heat‐resistant steels are significant materials used in boilers and nuclear reactors, owing to the excellent creep, fatigue, corrosion resistance, and mechanical properties. The precipitation and properties degenerate with the increasing temperature. It is necessary to clarify the main precipitation and properties under the service situation. Herein, the characteristic of main precipitation and the potential degraded mechanism of creep, fatigue, oxidation resistance, and corrosion resistance at high temperature are briefly reviewed. The main secondary phases under prolonged service environment include MX phase, M23C6 carbide, Z phase, Laves phase, and σ phase. Precipitation scattered uniformly is conductive to strength properties of steel and vice versa. Coarsening precipitation and the decrease of dislocation density are critical reason for the deteriorated mechanical properties at high temperature. The protective oxide films destroyed after exposure to boiler gas lead to failure of materials.

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Effect of Rare Earth/Stable Element Oxides on High Temperature Mechanical Properties of Low Chromium Nickel Ferritic Stainless Steel

Ma,

Guo,

et al. 2024

Lecture Notes in Mechanical Engineering

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Planar dislocation structure during creep-fatigue interactions of TP347H heat-resistant austenitic steel at 600 °C

Cited by 17 publications

References 37 publications

Characterization of Dislocation Structure in a Nb-bearing Austenitic Stainless Steel After Low Cycle Fatigue via TEM and EBSD

Characterization of Dislocation Structure in a Nb-bearing Austenitic Stainless Steel After Low Cycle Fatigue via TEM and EBSD

Precipitation and Properties at Elevated Temperature in Austenitic Heat‐Resistant Steels—A Review

Effect of Rare Earth/Stable Element Oxides on High Temperature Mechanical Properties of Low Chromium Nickel Ferritic Stainless Steel

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