Characterization of Austenite Dynamic Recrystallization under Different Z Parameters in a Microalloyed Steel

Ghazani, Mehdi Shaban; Eghbali, Beitallah

doi:10.1016/s1005-0302(11)60074-1

Cited by 49 publications

(22 citation statements)

References 22 publications

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“…, where ε̇is the strain rate, Q is the deformation activation energy, R is the universal gas constant, and T the deformation temperature [18,19]. At a constant deformation temperature and strain rate, the Z parameter remains constant, and thus the grain size remains unchanged after the completion of dynamic recrystallization.…”

Section: Discussionmentioning

confidence: 99%

Microstructures and mechanical properties of AZ61 magnesium alloy after isothermal multidirectional forging with increasing strain rate

Liu

Cui

2015

Materials Science and Engineering: A

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Section: Discussionmentioning

confidence: 99%

Microstructures and mechanical properties of AZ61 magnesium alloy after isothermal multidirectional forging with increasing strain rate

Liu

Cui

2015

Materials Science and Engineering: A

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“…Addition of alloying elements, such as V, Ti and Nb, could refine PAGS and the final microstructure by grain growth retardation [17,62,63]. Deformation above the non-recrystallisation temperature can help to reduce the austenite grain size by dynamic/static recrystallisation; and deformation below the non-recrystallisation temperature may increase the amount of crystal defects (dislocations, deformation bands) acting as nucleation sites for ferrite formation, which would refine the low temperature microstructure [38,64]. These effects of deformation will be studied in the future taking into account the limitations for strip casting technology with respect to the amount of deformation imparted.…”

Section: The Approaches To Improve Mechanical Propertiesmentioning

confidence: 99%

Microstructures and mechanical properties of TRIP steel produced by strip casting simulated in the laboratory

Xiong

Kostryzhev

Saleh

et al. 2016

Materials Science and Engineering: A

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Conventional transformation induced plasticity (TRIP) steel (0.17C-1.52Si-1.61Mn-0.03Al, wt%) was produced via strip casting technology simulated in the laboratory. Effects of holding temperature, holding time and cooling rate on ferrite formation were studied via analysis of the continuous cooling transformation diagram obtained here. A typical microstructure for conventional TRIP steels consisting of ~ 0.55 fraction of polygonal ferrite with bainite, retained austenite and martensite was obtained. However, coarse prior austenite grain size of ~80 μm led to large polygonal ferrite grain size of ~17 μm, coarse second phase regions of ~21 μm size, small amount of retained austenite (0.02-0.045) and the presence of Widmanstätten ferrite. Optimisation of the microstructure-property relationship was reached via a variation in the isothermal bainite transformation temperature. The highest retained austenite fraction of 0.045±0.003 with medium carbon content of 1.23±0.01 wt% was obtained after holding at 400 °C, resulting in the highest ultimate tensile strength of 590±35 MPa and largest total elongation of 0.27±0.05. The presence of TRIP effect in the studied steel was revealed through the analysis of strain hardening exponent and modified Crussard-Jaoul model. Effect of processing parameters on retained austenite retention and stress-strain behaviour was discussed. Conventional transformation induced plasticity (TRIP) steel (0.17C-1.52Si-1.61Mn-0.03Al, wt. %) was produced via strip casting technology simulated in the laboratory. Effects of holding temperature, holding time and cooling rate on ferrite formation were studied via analysis of the continuous cooling transformation diagram obtained here. A typical microstructure for conventional TRIP steels consisting of ~ 0.55 fraction of polygonal ferrite with bainite, retained austenite and martensite was obtained. However, coarse prior austenite grain size of ~ 80 μm led to large polygonal ferrite grain size of ~ 17 μm, coarse second phase regions of ~ 21 μm size, small amount of retained austenite (0.02 -0.045) and the presence of Widmanstätten ferrite. Optimisation of the microstructure-property relationship was reached via a variation in the isothermal bainite transformation temperature. The highest retained austenite fraction of 0.045±0.003 with medium carbon content of 1.23±0.01 wt. % was obtained after holding at 400 °C, resulting in the highest ultimate tensile strength of 590±35 MPa and largest total elongation of 0.27±0.05. The presence of TRIP effect in the studied steel was revealed through the analysis of strain hardening exponent and modified Crussard -Jaoul model. Effect of processing parameters on retained austenite retention and stress-strain behaviour was discussed.

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“…3(c). Grain size in this region can be expected to decrease rapidly with increasing strain [25], since localized shearing can further be aggravated by possible grain boundary sliding (GBS) of fine DRX grains in this softened region. These dislocation-free DRXed grains were found to form in the heavily sheared regions during the compression test at 300 1C, having extremely fine size less than 5 um as shown Fig.…”

Section: Resultsmentioning

confidence: 99%

Shear band formation during hot compression of AZ31 Mg alloy sheets

Kim

Lee

et al. 2012

Materials Science and Engineering: A

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Characterization of Austenite Dynamic Recrystallization under Different Z Parameters in a Microalloyed Steel

Cited by 49 publications

References 22 publications

Microstructures and mechanical properties of AZ61 magnesium alloy after isothermal multidirectional forging with increasing strain rate

Microstructures and mechanical properties of AZ61 magnesium alloy after isothermal multidirectional forging with increasing strain rate

Microstructures and mechanical properties of TRIP steel produced by strip casting simulated in the laboratory

Shear band formation during hot compression of AZ31 Mg alloy sheets

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