Enhanced tensile properties of a reversion annealed 6.5Mn-TRIP alloy via tailoring initial microstructure and cold rolling reduction

Cai, Minghui; Huang, Hongshou; Su, Junhua; Ding, Hua; Hodgson, Peter

doi:10.1016/j.jmst.2017.12.008

Cited by 30 publications

(15 citation statements)

References 36 publications

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“…Kim et al [ 22 ] showed that the partially recrystallized ferrite grains contribute to the high yield strength of MMnSs due to the low mobility of screw dislocations. Accordingly, partial recrystallization provides an opportunity to achieve a heterogeneous microstructure in MMnS as well with the matrix consisting of both the recrystallized ferrite and non-recrystallized martensite that contributes to the enhancement of yield strength via heterogeneous deformation-induced hardening [ 22 , 41 , 42 , 43 ].…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Multiphase Microstructure Formation through Partial Recrystallization of a Warm-Deformed Medium Mn Steel during High-Temperature Partitioning

et al. 2022

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A novel processing route is proposed to create a heterogeneous, multiphase structure in a medium Mn steel by incorporating partial quenching above the ambient, warm deformation, and partial recrystallization at high partitioning temperatures. The processing schedule was implemented in a Gleeble thermomechanical simulator and microstructures were examined by electron microscopy and X-ray diffraction. The hardness of the structures was measured as the preliminary mechanical property. Quenching of the reaustenitized sample to 120 °C provided a microstructure consisting of 73% martensite and balance (27%) untransformed austenite. Subsequent warm deformation at 500 °C enabled partially recrystallized ferrite and retained austenite during subsequent partitioning at 650 °C. The final microstructure consisted of a heterogeneous mixture of several phases and morphologies including lath-tempered martensite, partially recrystallized ferrite, lath and equiaxed austenite, and carbides. The volume fraction of retained austenite was 29% with a grain size of 200–300 nm and an estimated average stacking fault energy of 45 mJ/m2. The study indicates that desired novel microstructures can be imparted in these steels through suitable process design, whereby various hardening mechanisms, such as transformation-induced plasticity, bimodal grain size, phase boundary, strain partitioning, and precipitation hardening can be activated, resulting presumably in enhanced mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Heterogeneous Multiphase Microstructure Formation through Partial Recrystallization of a Warm-Deformed Medium Mn Steel during High-Temperature Partitioning

et al. 2022

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“…The main focus is currently put on TRIP steels (transformation induced plasticity) containing retained austenite in their microstructure which can transform to martensite during cold plastic deformation. This phenomenon contributes to the increase of homogenous deformation and thus increase in strength and total elongation [1,2]. The so-called third generation of advanced high strength steels tends to combine the exceptional mechanical properties of previous generations with relatively low costs [3,4].…”

Section: Introductionmentioning

confidence: 99%

Comparison of high strength steels with different aluminium and manganese contents using dilatometry

Hajšman¹,

Kučerová²,

Burdová³

2020

Manufacturing Technology

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In this paper, the properties of three low carbon steels containing different percentage of manganese (1.5 or 3 wt %) and aluminium (1.5 or 2 wt %) were tested using dilatometric analysis and metallography. The steels had chemical compositions typical for TRIP (Transformation induced plasticity) steels and the two steels with an increased manganese content already belonged to the third generation of AHS (advanced high strength) steels. The dilatometric measurement was employed not only to determine the characteristic transformation temperatures but also to simulate the heat treatment procedure commonly used for TRIP steels. Resulting microstructures obtained through this simulation were evaluated and compared. The two main alloying elements were proved to have a significant effect on the transition temperatures and thus on the processability and overall resulting properties of the material.

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“…One of the typical features of advanced high-strength steel (AHSS) is the ultra-fine grain which improves the strength and ductility simultaneously [1][2][3]. In general, the main strategies for grains refinement can be divided into two types [4]: one is the severe plastic deformation (SPD), and the other is the advanced thermo-mechanical process (ATP).…”

Section: Introductionmentioning

confidence: 99%

Ultra-fine-Grained Ferrite Prepared from Dynamic Reversal Austenite During Warm Deformation

Chen

Yaqiang

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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The ultra-fine-grained ferrite (UFGF) with the size of less than 1 μm is often difficult to be obtained for low-alloyed steel in practical production processing. In this study, considering the rod and wire production process, a new method for preparing the UFGF with submicron scale is proposed by warm deformation of six passes with total strain of 2.6, followed by the cooling process in Gleeble-3500 thermo-mechanical simulator. The results show that the UFGF with an average size of 0.64 μm could be obtained via the phase transformation from austenite grains with an average size of 3.4 μm, which are achieved by the deformation-induced reversal austenization during the high strain rate warm deformation. The main driving force for the reversal transformation is the stress. And the interval between the passes also plays an important role in the reversal austenization.

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Enhanced tensile properties of a reversion annealed 6.5Mn-TRIP alloy via tailoring initial microstructure and cold rolling reduction

Cited by 30 publications

References 36 publications

Heterogeneous Multiphase Microstructure Formation through Partial Recrystallization of a Warm-Deformed Medium Mn Steel during High-Temperature Partitioning

Heterogeneous Multiphase Microstructure Formation through Partial Recrystallization of a Warm-Deformed Medium Mn Steel during High-Temperature Partitioning

Comparison of high strength steels with different aluminium and manganese contents using dilatometry

Ultra-fine-Grained Ferrite Prepared from Dynamic Reversal Austenite During Warm Deformation

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