Study on the dynamic recrystallization model and mechanism of nuclear grade 316LN austenitic stainless steel

Wang, Shenglong; Zhang, Mingxian; Wu, Huanchun; Yang, Bin

doi:10.1016/j.matchar.2016.05.015

Cited by 109 publications

(24 citation statements)

References 45 publications

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“…This suggests that DRV played an important role during hot compression in the high strain rate domain (e.g., 10 s −1 ) at higher temperatures, which was also in accordance with the steady flow stress with strain in Figure 2c. As schematically displayed in Figure 8d, the new grain evolution involved the development of strain-induced HAGBs resulting from an increase in the misorientations of individual LAGBs and progressive subgrain rotation [30,31] upon further straining.…”

Section: Experimental Verification and Mechanism Analysismentioning

confidence: 99%

Physically-Based Modeling and Characterization of Hot Flow Behavior in an Interphase-Precipitated Ti-Mo Microalloyed Steel

Cai

Yang

et al. 2018

Metals

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Abstract:In this contribution, a series of hot compression tests was conducted on a typical interphase-precipitated Ti-Mo steel at relatively higher strain rates of 0.1~10 s −1 and temperatures of 900~1150 • C using a Gleeble-2000 thermo-mechanical simulator. A combination of Bergstrom and Kolmogorov-Johnson-Mehl-Avrami models was first used to accurately predict the whole flow behaviors of Ti-Mo steel involving dynamic recrystallization, under various hot deformation conditions. By comparing the characteristic stresses and material parameters, especially at the higher strain rates studied, the dependence of hot flow behavior on strain rate and deformation temperature was further clarified. The hardening parameter U and peak density ρ p exhibited an approximately positive linear relationship with the Zener-Hollomon (Z) parameter, while the softening parameter Ω dropped with increasing Z value. The Avrami exponent n A varied between 1.2 and 2.1 with lnZ, implying two diverse nucleation mechanisms of dynamic recrystallization. The experimental verification was performed as well based on the microstructural evolution and mechanism analysis upon straining. The proposed constitutive models may provide a powerful tool for optimizing the hot working processes of high performance Ti-Mo microalloyed steels with interphase precipitation.

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Section: Experimental Verification and Mechanism Analysismentioning

confidence: 99%

Physically-Based Modeling and Characterization of Hot Flow Behavior in an Interphase-Precipitated Ti-Mo Microalloyed Steel

Cai

Yang

et al. 2018

Metals

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“…However, discontinuous DRX phenomenon could not be observed, as shown in Figure 3b. From these, it could be concluded that the driving force of discontinuous DRX was the reduction of storage energy [35], and high strain rate could promote discontinuous DRX of austenite in 2707 HDSS. Besides, the existence of DRX grains in 2707 HDSS deformed at 1050 °C and 10 s −1 observed by TEM is shown in Figure 9.…”

Section: Analysis Of Microstructure Evolutionmentioning

confidence: 97%

Deformation Characteristic and Constitutive Modeling of 2707 Hyper Duplex Stainless Steel under Hot Compression

Jiao

Feng

et al. 2016

Metals

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Hot deformation behavior and microstructure evolution of 2707 hyper duplex stainless steel (HDSS) were investigated through hot compression tests in the temperature range of 900-1250 • C and strain rate range of 0.01-10 s −1 . The results showed that the flow behavior strongly depended on strain rate and temperature, and flow stress increased with increasing strain rate and decreasing temperature. At lower temperatures, many precipitates appeared in ferrite and distributed along the deformation direction, which could restrain processing of discontinuous dynamic recrystallization (DRX) because of pinning grain boundaries. When the temperature increased to 1150 • C, the leading softening behaviors were dynamic recovery (DRV) in ferrite and discontinuous DRX in austenite. When the temperature reached 1250 • C, softening behavior was mainly DRV in ferrite. The increase of strain rate was conducive to the occurrence of discontinuous DRX in austenite. A constitutive equation at peak strain was established and the results indicated that 2707 HDSS had a higher Q value (569.279 kJ·mol −1 ) than other traditional duplex stainless steels due to higher content of Cr, Mo, Ni, and N. Constitutive modeling considering strain was developed to model the hot deformation behavior of 2707 HDSS more accurately, and the correlation coefficient and average absolute relative error were 0.992 and 5.22%, respectively.

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“…Therefore, the newly proposed reconstruction criterion enhanced the capacity of characterization of the microstructure around the PAGB. Furthermore, many twins were generated in austenitic materials, which also required high quality of reconstructed boundaries [21]. The map in Figure 6a was reconstructed using only the conventional criterion of ∆θ ave minimization.…”

Section: Determination Of the Local γ Orientationmentioning

confidence: 99%

An Accurate Method for Crystallographic Reconstruction of Parent Austenite from Inherited Martensite in a Low-Alloy Steel

Wang

Jin

et al. 2019

Crystals

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The microstructure of austenite at high temperatures, which cannot be reserved at room temperatures, determines the properties of its transformed phase in low-alloy steels. Consequently, an accurate method is herein developed to reconstruct local orientations of the parent austenite (γ) phase from electron backscatter diffraction maps of the martensite (α ) microstructure. The orientation map of α is cropped into a grid of data squares as the reconstruction unit. The cropped square is then divided into the square inherited from only one γ grain and the square inherited from more than one γ grain. The local orientations around parent γ grain boundaries are more accurately determined using a newly proposed reconstruction criterion. Furthermore, the solution spaces for the orientation relationship and the parent γ orientation are refined, which simultaneously improves the calculation accuracy and efficiency of reconstruction procedure. The validated reconstruction method is applied to obtain local orientations of the deformed γ microstructure accurately.

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Study on the dynamic recrystallization model and mechanism of nuclear grade 316LN austenitic stainless steel

Cited by 109 publications

References 45 publications

Physically-Based Modeling and Characterization of Hot Flow Behavior in an Interphase-Precipitated Ti-Mo Microalloyed Steel

Physically-Based Modeling and Characterization of Hot Flow Behavior in an Interphase-Precipitated Ti-Mo Microalloyed Steel

Deformation Characteristic and Constitutive Modeling of 2707 Hyper Duplex Stainless Steel under Hot Compression

An Accurate Method for Crystallographic Reconstruction of Parent Austenite from Inherited Martensite in a Low-Alloy Steel

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