Effect of deformation schedule on the microstructure and mechanical properties of a thermomechanically processed C-Mn-Si transformation-induced plasticity steel

Timokhina, Ilana; Hodgson, Peter; Pereloma, Elena V.

doi:10.1007/s11661-003-0305-8

Cited by 65 publications

(33 citation statements)

References 20 publications

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“…[21] X-ray diffraction was performed with a PHILIPS** PW 1130 (40 kV, 25 mA) diffractometer to determine the amount of RA using the direct comparison method, a detailed description of which can be found elsewhere. [22,23] The detailed characterization of the microstructure after TMP and PS/BH was performed with a PHILIPS CM 20 transmission electron microscope operated at 200 kV. Samples for transmission electron microscopy (TEM) analysis were cut perpendicular to the rolling direction.…”

Section: Methodsmentioning

confidence: 99%

Microstructure-Property Relationship in the Thermomechanically Processed C-Mn-Si-Nb-Al-(Mo) Transformation-Induced Plasticity Steels Before and After Prestraining and Bake Hardening Treatment

Timokhina

Enomoto

Miller

et al. 2012

Metall Mater Trans A

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The effect of prestraining and bake hardening (PS/BH) on the development of microstructures and mechanical properties in thermomechanically processed transformation-induced plasticity (TRIP) steels with additions of Nb, Mo, and Al was studied by atom probe tomography (APT) and transmission electron microscopy (TEM). An increase in number density and sizes of clusters and nanoscale precipitates was observed in both steels but was more significant in the Nb-Al-Mo steel than in the Nb-Al steel. This increase could be explained by the possible fast diffusion of Nb and Mo atoms at low temperatures, as was observed for surface diffusivity. The contributions of cluster strengthening and precipitation strengthening to the yield strength increment after PS/BH were estimated.

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Section: Methodsmentioning

confidence: 99%

Microstructure-Property Relationship in the Thermomechanically Processed C-Mn-Si-Nb-Al-(Mo) Transformation-Induced Plasticity Steels Before and After Prestraining and Bake Hardening Treatment

Timokhina

Enomoto

Miller

et al. 2012

Metall Mater Trans A

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“…It was considered that the volume fraction of the RA is a critical feature providing the TRIP effect such that ahigher volume fraction of retained austenite results in an increase in the strain-hardening coefficient which in turn, enhances the total elongation of the steel [25][26][27]. However, further research led to the conclusion that while the volume fraction of RA is an important factor, the RA also had to possess a specific (optimum) stability in order to sustain the TRIP effect over a wide range of strains [28][29][30].…”

Section: Factors Affecting the Retained Austenite Stabilitymentioning

confidence: 99%

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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“…The slip directions, the normal vectors of the slip planes and the normal vectors of the non-glide planes used in the BCC crystal plasticity model are listed in table 3. The parameters for the martensitic transformation model are presented in table 4. The values in this table are representative of an austenite grain with a carbon concentration of 1.4 wt.%, for which the transformation product phase at room temperature is typically a twinned, thin-plate martensite [35,36].…”

Section: Model Parametersmentioning

confidence: 99%

Modelling of the effects of grain orientation on transformation-induced plasticity in multiphase carbon steels

Tjahjanto

Turteltaub

Suiker

et al. 2006

Modelling Simul. Mater. Sci. Eng.

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The effects of grain orientation on transformation-induced plasticity in multiphase steels are studied through three-dimensional finite element simulations. The boundary value problems analysed concern a uniaxiallyloaded sample consisting of a grain of retained austenite surrounded by multiple grains of ferrite. For the ferritic phase, a rate-dependent crystal plasticity model is used that describes the elasto-plastic behaviour of body-centred cubic crystalline structures under large deformations. In this model, the criticalresolved shear stress for plastic slip consists of an evolving slip resistance and a stress-dependent term that corresponds to the projection of the stress tensor on a non-glide plane (i.e. a non-Schmid stress). For the austenitic phase, the transformation model developed by Turteltaub and Suiker (2006 Int. J. Solids Struct. at press, 2005 J. Mech. Phys. Solids 53 1747 is employed. This model simulates the displacive phase transformation of a face-centred cubic austenite into a body-centred tetragonal martensite under external mechanical loading. The effective transformation kinematics and the effective anisotropic elastic stiffness components in the model are derived from lower-scale information that follows from the crystallographic theory of martensitic transformations. In the boundary value problems studied, the mutual interaction between the transforming austenitic grain and the plastically deforming ferritic matrix is computed for several grain orientations. From the simulation results, specific combinations of austenitic and ferritic crystalline orientations are identified that either increase or decrease the effective strength of the material. This information is useful to further improve the mechanical properties of multiphase carbon steels. In order to quantify the anisotropic 1 Author to whom any correspondence should be addressed.

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Effect of deformation schedule on the microstructure and mechanical properties of a thermomechanically processed C-Mn-Si transformation-induced plasticity steel

Cited by 65 publications

References 20 publications

Microstructure-Property Relationship in the Thermomechanically Processed C-Mn-Si-Nb-Al-(Mo) Transformation-Induced Plasticity Steels Before and After Prestraining and Bake Hardening Treatment

Microstructure-Property Relationship in the Thermomechanically Processed C-Mn-Si-Nb-Al-(Mo) Transformation-Induced Plasticity Steels Before and After Prestraining and Bake Hardening Treatment

Retained Austenite: Transformation-Induced Plasticity

Modelling of the effects of grain orientation on transformation-induced plasticity in multiphase carbon steels

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