Effect of prior austenite grain size on the evolution of microstructure and mechanical properties of an intercritically annealed medium manganese steel

Chandan, Avanish Kumar; Bansal, Gaurav; Kundu, Janardan; Chakraborty, Jay; Chowdhury, Sandip Ghosh

doi:10.1016/j.msea.2019.138458

Cited by 55 publications

(37 citation statements)

References 55 publications

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“…It has now been an accepted fact, considering the recent research reports, that the presence of retained austenite in the microstructure suppresses the microcrack propagation and absorbs dislocations from adjacent martensite, leading to improvement in ductility as well as impact toughness. [23][24][25][26] This implies that the amount, size, distribution and morphology of retained austenite would play a determining role in the response to deformation. The present authors, in their earlier study, [11] looked into the effect of quench temperature on the retained austenite content for the same steel investigated in the present work.…”

Section: Discussionmentioning

confidence: 99%

Quench Temperature-Dependent Mechanical Properties During Nonisothermal Partitioning

Bansal

Jena

Ghosh

et al. 2020

Metall Mater Trans A

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The present study demonstrates the role of hot rolling and quench temperature in determining the mechanical properties of low alloy steel processed through quenching and nonisothermal partitioning (Q&P) route. The results indicate that the abrasive wear resistance does not show any significant variation with quench temperature. However, a reduction in tensile strength and an increase in charpy impact toughness and elongation is observed with increasing quench temperature. Interestingly, the retained austenite shows high thermal stability at sub-zero temperature. Furthermore, during deformation through the wear process, the retained austenite experiences the TRIP effect that leads to improvement in wear resistance. The incorporation of hot rolling prior to Q&P led to a significant improvement in strength, energy absorption capability and wear resistance due to a considerable refinement of the microstructural constituents.

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Section: Discussionmentioning

confidence: 99%

Quench Temperature-Dependent Mechanical Properties During Nonisothermal Partitioning

Bansal

Jena

Ghosh

et al. 2020

Metall Mater Trans A

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“…VC particles are generated during the aging process [ 6 , 17 ], wheereas the martensite-to-austenite reverse transformation also occurs [ 18 ], accompanied by prominent C, Mn, and Al partitioning behavior [ 19 ]. The austenite stability is mainly determined by the chemical composition [ 20 ].…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Mechanical Properties of a Medium-Mn Steel with 1.3 GPa-Strength and 40%-Ductility

et al. 2021

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Steel designs with superior mechanical properties have been urgently needed in automotive industries to achieve energy conservation, increase safety, and decrease weight. In this study, the aging process is employed to enhance the yield strength (YS) by tailoring the distribution of V-rich precipitates and to improve ductility by producing high volume fractions of recrystallized ferrite in cold-rolled medium-Mn steel. A reliable method to acquire ultra-high strength (1.0–1.5 GPa), together with ductility (>40%), is proposed via utilizing non-recrystallized austenite and recrystallized ferrite. Similarly to conventional medium-Mn steels, the TRIP effect, along with the mild TWIP effect, is responsible for the main deformation mechanisms during tensile testing. However, the coupled influence of precipitation strengthening, grain refinement strengthening, and dislocation strengthening contributes to an increase in YS. The studied steel, aged at 650 °C for 5 h, demonstrates a YS of 1078 MPa, ultimate tensile strength (UTS) of 1438 MPa, and tensile elongation (TE) of 30%. The studied steel aged at 650 °C for 10 h shows a UTS of 1306 MPa and TE of 42%, resulting in the best product in terms of of UTS and TE, at 55 GPa·%. Such a value surpasses that of the previously reported medium-Mn steels containing equal mass fractions of various microalloying elements.

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“…The presence of retained austenite is due to its high thermal stability revealing during heat treatment. Its stability is influenced by carbon and manganese contents in the austenite, a morphology, dislocation density and the neighborhood of soft or hard phases [7][8][9]. These factors determine the amount of retained austenite present in the microstructure and resulting mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, once hot rolling in the austenitic field has been applied, either coiling [8] or austempering [1,2] is usually applied so austenite is retained in the final microstructure as part of its incomplete transformation on final cooling. On the contrary, the cold-rolled medium-Mn steels require intercritical annealing as a final heat treatment step [6,7]. In such cases, the austenite is formed upon heating conditions.…”

Section: Introductionmentioning

confidence: 99%

Dilatometric Study of Phase Transformations in 5 Mn Steel Subjected to Different Heat Treatments

et al. 2020

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The work presents results of phase transformation kinetics of hot-rolled 5% Mn steel subjected to different heat treatments. Three different schedules were introduced: isothermal holding in a bainite region, coiling simulation and intercritical annealing. The evolution of microstructure components was investigated using dilatometric and metallographic analyses. According to obtained results, the medium-Mn steel exhibits high resistance for γ/α transformation during the bainite transformation and coiling simulation (upon cooling from the austenite region). During 5 h isothermal holding, no bainite and/or ferrite formation was detected. This results in the formation of martensite upon cooling to room temperature. Differently, when the steel was subjected to the intercritical annealing at 720 and 700 °C (upon heating from room temperature), a final microstructure consisted of ferrite, martensite and retained austenite. At 700 °C, no fresh martensite formation was detected upon cooling to room temperature. This means that the austenite was enriched in carbon during the intercritical annealing step enough to keep its thermal stability.

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Effect of prior austenite grain size on the evolution of microstructure and mechanical properties of an intercritically annealed medium manganese steel

Cited by 55 publications

References 55 publications

Quench Temperature-Dependent Mechanical Properties During Nonisothermal Partitioning

Quench Temperature-Dependent Mechanical Properties During Nonisothermal Partitioning

Microstructure and Mechanical Properties of a Medium-Mn Steel with 1.3 GPa-Strength and 40%-Ductility

Dilatometric Study of Phase Transformations in 5 Mn Steel Subjected to Different Heat Treatments

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