The effects of the initial microstructure on microstructural evolution, mechanical properties and reversed austenite stability of intercritically annealed Fe-6.1Mn-1.5Si-0.12C steel

Yan, Shu; Li, Xianghua; Liang, Taosha; Zhao, Yang

doi:10.1016/j.msea.2017.11.118

Cited by 41 publications

(17 citation statements)

References 32 publications

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“…The morphology of the final microstructure is composed of lath constituents. When the reverse austenite transformation took place, the morphology of martensite is inherited by austenite and ferrite [23,24]. Moreover, this lath morphology of austenite influences positively its stability [25,26].…”

Section: Discussionmentioning

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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Section: Discussionmentioning

confidence: 99%

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

et al. 2020

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“…The dependence of austenite stability on its morphology is frequently reported in the literature for different steel grades [ 81 , 82 , 83 , 84 , 85 ]. It is generally found that the blocky austenite is less stable as compared with the filmy austenite during plastic deformation [ 22 , 86 ].…”

Section: The Factors Govern Austenite Stabilitymentioning

confidence: 99%

“…The blocky austenite with a larger volume shall have a lower dislocation density. Therefore, the effect of morphology, which is supposed to intrinsically affect the austenite stability, is frequently influenced by the other governing factors, which can be attributed to the complex microstructures derived from phase transformation as well as the macroscopic tensile The dependence of austenite stability on its morphology is frequently reported in the literature for different steel grades [81][82][83][84][85]. It is generally found that the blocky austenite is less stable as compared with the filmy austenite during plastic deformation [22,86].…”

Section: Morphologymentioning

confidence: 99%

On the Factors Governing Austenite Stability: Intrinsic versus Extrinsic

2020

Materials

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In this review, we separate the different governing factors on austenite stability into intrinsic and extrinsic factors, depending on the domain defined by austenite grain boundaries. The different measuring techniques on the effectiveness of the governing factors in affecting the austenite stability are discussed. On the basis of the austenite stability, a new alloy design strategy that involves the competition between the intrinsic and extrinsic factors to control the transformation-induced plasticity (TRIP) effect to realize the stronger the more ductile steel is proposed. The present review may provide new insights into the development of novel thermal-mechanical processing to advance the mechanical properties of steels for industrial applications.

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“…The development of advanced ultrahigh strength steels is promoted by the need for lightweight bodies, and medium-Mn steels with 3–10% Mn are considered one of the most promising materials for automobile mass reduction [ 1 , 2 , 3 ]. When medium-Mn steels were first developed by Miller in 1972 [ 4 ], a substantial amount of research and development work had been carried out.…”

Section: Introductionmentioning

confidence: 99%

Strong Interactions between Austenite and the Matrix of Medium-Mn Steel during Intercritical Annealing

et al. 2020

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The effects of heat treatment on the microstructure evolution was studied in regards to austenite nucleation and grain growth. It was found that the austenite nucleation and matrix recrystallization kinetics of samples annealed at 675 °C for different times were revealed, implying a strong interaction between the ferrite matrix and austenite was revealed. The recrystallization of the matrix during annealing provided favorable conditions for austenite nucleation and growth, and the formation of austenite during this process reduced the matrix recrystallization kinetics, thus delaying the recrystallization process of the matrix around the austenite grains. The statistical results for the austenite grain size under different annealing temperatures indicated that the average grain size of the austenite slightly increases with increasing of the annealing temperature, but the austenite with the largest grain size grows faster at the same temperature. This difference is attributed to the strict Kurdjumov Sachs (KS) orientation relationship (OR) between the austenite grains and the matrix, because the growth of austenite with a strict KS OR with the matrix is often inhibited during annealing. In contrast, the austenite maintains a non-strict KS OR with the matrix and can grow preferentially with increasing annealing temperature and time.

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The effects of the initial microstructure on microstructural evolution, mechanical properties and reversed austenite stability of intercritically annealed Fe-6.1Mn-1.5Si-0.12C steel

Cited by 41 publications

References 32 publications

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

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

On the Factors Governing Austenite Stability: Intrinsic versus Extrinsic

Strong Interactions between Austenite and the Matrix of Medium-Mn Steel during Intercritical Annealing

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