Investigation on the Microstructural Evolution in a Medium-Mn steel (X10Mn5) after Intercritical Annealing

Steineder, Katharina; Schneider, Reinhold; Križan, Daniel; Béal, Coline; Sommitsch, Christof

doi:10.3139/105.110248

Cited by 9 publications

(12 citation statements)

References 11 publications

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“…The differences in etching behavior are most likely due to the enrichment of the austenite in Mn, with a significantly lower electrochemical potential compared to the adjacent ferrite. [24] The amount of retained austenite was measured by X-ray diffraction according to ASTM E975-03.…”

Section: Methodsmentioning

confidence: 99%

Comparative Investigation of Phase Transformation Behavior as a Function of Annealing Temperature and Cooling Rate of Two Medium‐Mn Steels

Steineder

Schneider

Križan

et al. 2015

steel research int.

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Transformation-induced plasticity (TRIP)-assisted medium-Mn steels with a ferritic matrix containing considerable amounts of retained austenite are a promising candidate to fulfill the requirements for the third-generation of advanced high-strength steels (AHSS), which is currently under development. The influence of the intercritical annealing temperature and cooling rate on the final microstructure of a 0.1C3.5Mn and 0.1C5Mn steel, respectively, was elaborately investigated. Dilatometric experiments were carried out and additionally supported by microstructural observations. During soaking in the two-phase ferriteaustenite region and subsequent slow cooling the C and Mn concentration in the austenite increased and resulted in its chemical stabilization. The variation of the annealing temperature and cooling rate altered the amounts of ferrite, retained austenite, bainite, pearlite, and martensite in the final microstructure. Furthermore, two thermodynamical models for the prediction of the maximum retained austenite content and the optimal annealing temperature have been thoroughly evaluated in this work. It can be stated that the experimental data revealed a shift of the maximum retained austenite to higher annealing temperatures compared to the model calculations. As diffusional transformations were not considered in the applied models, slow cooling rates led to pronounced deviations between calculation and experiment, thereby showing the need for model adaptions.

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Section: Methodsmentioning

confidence: 99%

Comparative Investigation of Phase Transformation Behavior as a Function of Annealing Temperature and Cooling Rate of Two Medium‐Mn Steels

Steineder

Schneider

Križan

et al. 2015

steel research int.

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“…Among new steel grades developed for application to car bodies [1][2][3][4][5], high-manganese austenitic steels are attractive materials for the automotive industry because of their unique combination of high strength, ductility, and formability. High-manganese steels are characterized by a high work-hardening rate resulting from TRIP (transformationinduced plasticity), TWIP (twinning-induced plasticity), or SIP (shear-induced plasticity) effects [6,7].…”

Section: Introductionmentioning

confidence: 99%

Effect of Deformation Temperature on Microstructure Evolution and Mechanical Properties of Low-Carbon High-Mn Steel

Grajcar

Kozłowska

Topolska

et al. 2018

Advances in Materials Science and Engineering

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is work addresses the influence of deformation temperature in a range from −40°C to 200°C on the microstructure evolution and mechanical properties of a low-carbon high-manganese austenitic steel. e temperature range was chosen to cope at the time during sheet processing or car crash events. Experimental results show that yield stress and ultimate tensile strength gradually deteriorate with an increase in the tensile testing temperature. e dominant mechanism responsible for the strain hardening of steel changes as a function of deformation temperature, which is related to stacking fault energy (SFE) changes. When the deformation temperature rises, twinning decreases while a role of dislocation slip increases.

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“…As a consequence of the intercritical heating, in particular when combined with short holding times, inhomogeneous distributions of the alloying elements carbon and manganese occur . The austenite forming within the transformation interval between A c 1 and A c 3 possesses a higher concentration of carbon and other alloying elements than the austenite occurring at higher temperatures toward the end of the transformation .…”

Section: Discussionmentioning

confidence: 99%

The Effect of Intercritical Annealing on the Microstructure and Mechanical Properties of Ferritic–Martensitic Two‐Phase Steels

Wolf¹,

Nürnberger²,

Rodman³

et al. 2016

steel research int.

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Modified press‐hardening processes are very attractive for manufacturing safety‐relevant vehicle body parts from steels with martensitic–ferritic microstructures. In the process developed, the formation of the two‐phase microstructure and the hot sheet forming simultaneously occur subsequently to an intercritical annealing. By contrast, previously used process chains do not integrate setting of a multi‐phase microstructure within the forming step. In order to successfully combine the intercritical annealing with the actual forming, comprehensive knowledge of the microstructural evolution and the resulting mechanical properties is needed. Specifically, different heat‐treating routes are used to obtain different microstructures of ferritic–martensitic dual‐phase steels and partial martensitic steels. As a result of intercritical annealing in the temperature range of Ac1–Ac3, it is possible to vary the martensite volume fractions from 7 to 96 vol%. The data obtained can be employed for numerically describing the microstructural transformation and for designing the heat treatment process. It is demonstrated that this combined process allows for designing steels that feature properties that are similar to complex‐phase steels.

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Investigation on the Microstructural Evolution in a Medium-Mn steel (X10Mn5) after Intercritical Annealing

Cited by 9 publications

References 11 publications

Comparative Investigation of Phase Transformation Behavior as a Function of Annealing Temperature and Cooling Rate of Two Medium‐Mn Steels

Comparative Investigation of Phase Transformation Behavior as a Function of Annealing Temperature and Cooling Rate of Two Medium‐Mn Steels

Effect of Deformation Temperature on Microstructure Evolution and Mechanical Properties of Low-Carbon High-Mn Steel

The Effect of Intercritical Annealing on the Microstructure and Mechanical Properties of Ferritic–Martensitic Two‐Phase Steels

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