The modeling of retained austenite in low-alloyed TRIP steels

Reisner, G.; Werner, Ewald; Kerschbaummayr, P.; Papst, I.; Fischer, Franz Dieter

doi:10.1007/bf02914354

Cited by 43 publications

(21 citation statements)

References 9 publications

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“…Since the first observations of the TRIP effect in metastable austenitic steels [14,15], a large volume of modelling [5-6, 10, 11, 16-18] and experimental work [5,15,16,18,19] has been aimed at understanding the mechanism. During the austenite to martensite transformation, the macroscopic plastic strain, arises from the shape change as determined by the preferential selection of favourable crystallographic variants (Magee effect [9]) and from the plastic accommodation processes which occur around the forming martensite grains (the Greenwood-Johnson effect) [6,12,16,19].…”

Section: Transformation-induced Plasticity Effectmentioning

confidence: 99%

“…Just as a fast rate of transformation of the RA with low C content ( <0.6 wt %) during plastic straining does not contribute to an increase in elongation [18], a much higher C content (>1.8 wt .%) results in the incomplete transformation of the RA to martensite and also does not lead to an increase in elongation [33]. In a steel with an average C content of 1.8 % [58], the operation of twinning in austenite has been noted at a strain of 0.17.…”

Section: Overall Chemical Composition and Carbon Contentmentioning

confidence: 99%

See 1 more Smart Citation

Retained Austenite: Transformation-Induced Plasticity

Pereloma¹,

Gazder²,

Timokhina³

2016

Encyclopedia of Iron, Steel, and Their Alloys

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The deformation-induced phase transformation of metastable austenite to martensite is accompanied by macroscopic plastic strain and results in significant work hardening and the delayed onset of necking. Steels that exhibit such transformation-induced plasticity (TRIP) effect possess high strength-ductility ratios and improved toughness. Since the stability of the retained austenite (RA) phase is the rate controlling mechanism for the TRIP effect, the factors affecting the chemical and mechanical stability of RA in CMnSi TRIP steels are discussed. It was suggested that chemical stability plays a more important role at low strains, whereas other factors become responsible for RA behavior at higher strains. The importance of optimizing the processing parameters to achieve the desirable level of austenite stability is highlighted. Finally, the influence of mechanical testing conditions and the interaction between the phases during tensile testing are also detailed. ABSTRACTThe deformation-induced phase transformation of metastable austenite to martensite is accompanied by macroscopic plastic strain and results in significant work hardening and the delayed onset of necking. Steels that exhibit such transformation-induced plasticity (TRIP) effect possess high strength-ductility ratios and improved toughness. Since the stability of the retained austenite phase is the rate controlling mechanism for the TRIP effect, the factors affecting the chemical and mechanical stability of retained austenite in CMnSi TRIP steels are discussed. It was suggested that chemical stability plays a more important role at low strains, whereas other factors become responsible for the RA behavior at higher strains. The importance of optimising the processing parameters to achieve the desirable level of austenite stability was highlighted. Finally, the influence of mechanical testing conditions and the interaction between the phases during tensile testing are also detailed.Eds. R. Colás and G. E. Totten, chapter TRIP effect and retained austenite stability in steels 2

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Section: Transformation-induced Plasticity Effectmentioning

confidence: 99%

Section: Overall Chemical Composition and Carbon Contentmentioning

confidence: 99%

Retained Austenite: Transformation-Induced Plasticity

Pereloma¹,

Gazder²,

Timokhina³

2016

Encyclopedia of Iron, Steel, and Their Alloys

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“…It is well known that the RA is subject to both chemical and mechanical stabilization. [27,56,57] In order for transformation to martensite to take place under the load, the size of the RA should be sufficient for the martensite nuclei to form and its carbon content should be an intermediate one. If the carbon content is too low, then the RA will transform very quickly on initial loading and will not contribute significantly to the work hardening and ability of the steel to withstand the load.…”

Section: Comparison Of the Mechanical Behavior Of Nanobainitic Steelsmentioning

confidence: 99%

Understanding the Behavior of Advanced High-Strength Steels Using Atom Probe Tomography

Pereloma

Beladi

Zhang

et al. 2011

Metall Mater Trans A

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The key evidence for understanding the mechanical behavior of advanced high strength steels was provided by atom probe tomography (APT). Chemical overstabilization of retained austenite (RA) leading to the limited transformation-induced plasticity (TRIP) effect was deemed to be the main factor responsible for the low ductility of nanostructured bainitic steel. Appearance of the yield point on the stress-strain curve of prestrained and bake-hardened transformationinduced plasticity steel is due to the unlocking from weak carbon atmospheres of newly formed during prestraining dislocations.

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“…As various processing schedules result in different microstructures, the focus of many research projects has been on increasing the volume fraction of the RA and its stability during straining [7,9,10]. Chemical (carbon content) and mechanical (size and morphology) stability of the RA are both important parameters that need to be controlled in order to achieve the desired strength-ductility balance in TRIP steels [7,[10][11][12][13][14]. In the present study, the correlation of the mechanical properties with the behaviour of the RA during tensile testing in thermo-mechanically processed TRIP steels is carried out.…”

Section: Introductionmentioning

confidence: 99%

Addressing Retained Austenite Stability in Advanced High Strength Steels

Pereloma

Gazder

Timokhina

2013

MSF

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Advances in the development of new high strength steels have resulted in microstructures containing significant volume fractions of retained austenite. The transformation of retained austenite to martensite upon straining contributes towards improving the ductility. However, in order to gain from the above beneficial effect, the volume fraction, size, morphology and distribution of the retained austenite need to be controlled. In this regard, it is well known that carbon concentration in the retained austenite is responsible for its chemical stability, whereas its size and morphology determines its mechanical stability. Thus, to achieve the required mechanical properties, control of the processing parameters affecting the microstructure development is essential. Abstract. Advances in the development of new high strength steels have resulted in microstructures containing significant volume fractions of retained austenite. The transformation of retained austenite to martensite upon straining contributes towards improving the ductility. However, in order to gain from the above beneficial effect, the volume fraction, size, morphology and distribution of the retained austenite need to be controlled. In this regard, it is well known that carbon concentration in the retained austenite is responsible for its chemical stability, whereas its size and morphology determines its mechanical stability. Thus, to achieve the required mechanical properties, control of the processing parameters affecting the microstructure development is essential.

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The modeling of retained austenite in low-alloyed TRIP steels

Cited by 43 publications

References 9 publications

Retained Austenite: Transformation-Induced Plasticity

Retained Austenite: Transformation-Induced Plasticity

Understanding the Behavior of Advanced High-Strength Steels Using Atom Probe Tomography

Addressing Retained Austenite Stability in Advanced High Strength Steels

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