Role of the annealing twin boundary on the athermal α′-martensite formation in a 304 austenitic stainless steel

Sadeghi, Fazlollah; Zargar, Tahereh; Kim, Jong Wan; Heo, Yoon-Uk; Lee, Jae Sang; Yim, Chang Hee

doi:10.1016/j.mtla.2021.101218

Cited by 6 publications

(7 citation statements)

References 43 publications

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“…For the annealed samples, the EBSD measurement showed that all of the martensite phase was removed and only the austenite phase remained. However, the results are not shown here (Sadeghi et al, 2021). The absence of the martensite phase could be explained by the neutron transmission spectra shown in Fig.…”

Section: Samplementioning

confidence: 76%

“…Additionally, it can non-destructively analyze archeological and cultural artifacts (Shiota et al, 2017;Cho et al, 2021). Conventional methods such as electron backscatter diffraction (EBSD) (Sadeghi et al, 2021), neutron and X-ray diffraction (Albertini et al, 2000), and metallographic etching methods have been reliably used for material characterization. These methods are destructive and localized, and provide characteristics for material from a selected sample surface.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and texture analysis of 304 austenitic stainless steel using Bragg edge transmission imaging

Bakhtiari,

Sadeghi,

Sato

et al. 2023

J Appl Cryst

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Bragg edge imaging using pulsed neutrons is a non-destructive technique for studying microstructure and texture of materials. It provides two-dimensional visualization of crystallographic information using a pixelated gas electron multiplier detector and a time-of-flight method. In this work, the properties of type 304 austenitic stainless steel samples were studied via Bragg edge imaging. The samples included hot-rolled, cold-rolled and heat-treated specimens, which were characterized to investigate texture, phase fraction and grain growth. The results showed that the crystallite size increased with increasing annealing temperature. The cold-rolled and annealed samples exhibited strong textures, while the hot-rolled sample showed no preferred orientation. The phase volume fraction of induced martensite in the cold-rolled sample was also obtained. Two-dimensional maps of microstructures and textures were obtained without destructive processes. The results were validated by electron backscatter diffraction and found to be consistent. This work provides valuable information for non-destructive characterization of bulk materials by performing Bragg edge imaging using the Hokkaido University compact accelerator neutron source.

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Section: Samplementioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Microstructure and texture analysis of 304 austenitic stainless steel using Bragg edge transmission imaging

Bakhtiari,

Sadeghi,

Sato

et al. 2023

J Appl Cryst

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“…At this time, the slip continues with the help of twinning, and the twinning deformation process is relatively fast. The shear stress required for twinning deformation is greater than the shear stress required for slip [9]. When the orientation of the crystal is not conducive to slip, twinning deformation occurs.…”

Section: Dislocation Density Evolutionmentioning

confidence: 97%

“…for slip [9]. When the orientation of the crystal is not conducive to slip, twinning deformation occurs.…”

Section: Dislocation Density Evolutionmentioning

confidence: 99%

“…M d temperature is a temperature above which deformation does not induce martensitic transformation. Various studies of MASS plastically deformed at room temperature have shown that dissociated dislocations, laminar dislocations, deformation twins and ε-martensite with an hcp structure occur within the austenite [7][8][9][10]. These microstructures, which can be collectively referred to as shear zones, tend to occur during plastic deformation of materials with low-stacking fault energy, and α'-martensite tends to nucleate and grow at the location of such shear zones and their intersections [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Investigation on Creep Deformation and Age Strengthening Behavior of 304 Stainless Steel under High Stress Levels

Zhan,

Xie,

Yang

et al. 2024

Materials

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The creep deformation behavior and age strengthening behavior of 304 stainless steel under high stress levels were systematically studied by uniaxial creep test, tensile test, XRD diffraction test and transmission electron microscopy. The results show that the total creep strain and the initial creep strain rate increase with the increase in stress level, and the creep strain in the whole aging process is mainly produced in the initial creep stage. The calculated stress exponent shows that the main mechanism of creep deformation of 304 stainless steel at 453 K is dislocation slip. The strength and plasticity of 304 stainless steel after creep aging are improved simultaneously. Microstructural observations indicate an increase in dislocation density and martensite content, as well as austenite and twins, leading to an improvement in strength and plasticity, respectively. In addition, considering the influence of dislocation density on creep behavior, the relative dislocation density increase is introduced into the hyperbolic sine creep model, and a simple mechanism-based creep aging constitutive model is established. The creep strain predicted by the model is in good agreement with the experimental data of 304 stainless steel. The findings can provide theoretical support for the application of creep age forming in 304 stainless steel parts.

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Kinetic Model to Investigate the Effect of Cooling Rate on δ-Ferrite Behavior and Its Application in Continuous Casting of AISI 304 Stainless Steel

et al. 2021

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The prediction of M-shaped δ-ferrite content along the thickness direction of continuously cast 304 austenitic stainless steel slab was performed using a diffusion-controlled phase transformation module of Thermo-Calc software. The surface and center of the slab, which solidified with different cooling rates and secondary dendrite arm spacing, were used for kinetic calculations. Comparison between observations and calculations for slab specimens demonstrated that the moving-boundary model could predict retained δ-ferrite content according to various thermal histories. After this validation, the effects of different cooling rates at liquid and solid-state were analyzed to understand the importance of each stage on the diffusioncontrolled δ → phase transformation. Decrease in solid-state cooling rate generally had a larger effect on the reduction of δ-ferrite during cooling when the solidification rate was fast (27.75 °C/s) than when it was slow (0.075 °C/s). This model can be used to predict and control δ-ferrite behavior under different thermal histories during slab casting and welding practices.

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Role of the annealing twin boundary on the athermal α′-martensite formation in a 304 austenitic stainless steel

Cited by 6 publications

References 43 publications

Microstructure and texture analysis of 304 austenitic stainless steel using Bragg edge transmission imaging

Microstructure and texture analysis of 304 austenitic stainless steel using Bragg edge transmission imaging

Investigation on Creep Deformation and Age Strengthening Behavior of 304 Stainless Steel under High Stress Levels

Kinetic Model to Investigate the Effect of Cooling Rate on δ-Ferrite Behavior and Its Application in Continuous Casting of AISI 304 Stainless Steel

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