Dislocation and twinning mechanisms for dynamic recrystallization of as-cast Mn18Cr18N steel

Qin, Fengming; Zhu, Hua; Wang, Zhenxing; Zhao, Xiaodong; He, Wei; Chen, Huiqin

doi:10.1016/j.msea.2016.12.095

Cited by 64 publications

(14 citation statements)

References 36 publications

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“…This was in agreement with the continuous softening mechanism observed on the flow curves in Figure 2a. Accordingly, the formation of new equiaxed grains was mainly associated with the rearrangement or annihilation of dislocations [28,29]. Meanwhile, further straining was accompanied by an acceleration of the transformation of low to high angle grain boundaries resulting from the recovery-assisted absorption of dislocations in the existing sub-boundaries.…”

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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“…Equation (1) is commonly used to describe the adiabatic-temperature rise (DT) caused by deformation 12 where s is the flow stress, e is the true strain, and r is the material density (7.93 g/m 3 ). The specific calorific value C p was selected according to the previous finding from report 10 and h corresponds to the thermal efficiency, calculated with Equation 2 Figure 2 shows the temperature rise at different rates and temperatures at a strain of 0.69. It can be seen that the temperature rise increases with the increasing strain rate and the decreasing deformation temperature.…”

Section: Thermal Effect Due To Deformation Heatingmentioning

confidence: 99%

“…In the process of nonlinear energy consumption, the microscopic mechanism corresponding to different deformation conditions affects the change in the dissipation covariate J. The non-dimensional efficiency index h is the ratio of organizational evolution and ideal linear energy, as shown in Equation (10).…”

Section: P G Jmentioning

confidence: 99%

“…Both dynamic recrystallization and twins promote each other. Qin 10 found that in a metal with a lower stacking-fault energy, twinning is an important dynamic-recrystallization mechanism at a high temperature and strain rate. The white arrows point out that there is a large number of slip lines parallel to each other in some grains in the 304L steel, but the increase in the number of twins in 2.42 % Cu-304L hinders the sliding movement and reduces the slip line.…”

Section: Organization Analysis In Typical Regionsmentioning

confidence: 99%

“…9 The flow curves of the as-cast Mn18Cr18N indicate monotonic work hardening. 10 In this study, the hot-deformation behavior of the ascast 304L austenitic stainless steel and 2.42 % Cu-304L steel were investigated with compression test. The constitutive equation for the production process was developed to evaluate the activation energy.…”

Section: Introductionmentioning

confidence: 99%

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Effect of copper element on hot behavior of 304L stainless steel

Li¹,

Zhao²,

Ma³

et al. 2018

Mater. Tehnol.

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Hot-deformation behavior of the 304L stainless steel containing copper was investigated with compression experiments at temperatures ranging from 1173 K to 1423 K under strain rates of 0.01-20 s-1 up to the true strain of 0.69. The adiabatic heating analysis indicated that the addition of copper to 304L resulted in a temperature rise, which was found to be sensitive to the strain rate. By calculating the constitutive equation, the hot-deformation activation energy of the non-Cu-containing steel was found to be 409 kJ/mol, but it reduced to 376 kJ/mol when 2.42 % copper was added to the steel, which implied that the addition of copper to stainless steel was not conducive to the occurrence of dynamic recrystallization. Furthermore, the true stress-strain curves indicated that the dynamic-recrystallization temperature and strain rate of the 2.42 % Cu-304L steel decreased. The processing maps showed that the unstable region increased and the hot-working area became narrower. The instability region was dominated by the adiabatic-shear zone and local-flow instability. Moreover, the morphological changes of d-ferrite into coarse columnar crystals made the steel more prone to cracking.

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Hot Ring Rolling and Cold Expanding Strengthening of Mn18Cr18N Thick-Wall Hollow Ingots

et al. 2021

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Dislocation and twinning mechanisms for dynamic recrystallization of as-cast Mn18Cr18N steel

Cited by 64 publications

References 36 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

Effect of copper element on hot behavior of 304L stainless steel

Hot Ring Rolling and Cold Expanding Strengthening of Mn18Cr18N Thick-Wall Hollow Ingots

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