Metallographic Methods for Revealing the Multiphase Microstructure of TRIP-Assisted Steels

Girault, Etienne; Jacques, Pascal; Harlet, Philippe; Mols, Koen; Humbeeck, Jan Van; Aernoudt, Etienne; Delannay, Francis

doi:10.1016/s1044-5803(97)00154-x

Cited by 225 publications

(104 citation statements)

References 8 publications

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“…defined as Microstructures were studied by light microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) after particular preparation routes described elsewhere. 10) Retained austenite contents were measured by Mössbauer spectroscopy. 8) X-ray diffraction was used to determine the lattice parameter (a 0 ) of retained austenite and therefore its carbon content by making use of the relationship 11) : Figure 1 sketches the map giving the evolution of the phases present in the room temperature microstructure of steel LSi after increasing bainite transformation times.…”

Section: Methodsmentioning

confidence: 99%

The Developments of Cold-rolled TRIP-assisted Multiphase Steels. Low Silicon TRIP-assisted Multiphase Steels.

Jacques

Girault

Harlet³

et al. 2001

ISIJ International

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114

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TRIP-assisted multiphase steels are newly developed steels exhibiting an improved balance of strength and ductility very well adapted for the automotive industry. In order to allow the retention of austenite, the steels studied up to now contained high levels of silicon incompatible with the industrial practice. This study shows how the combination of both a composite strengthening effect and the TRIP effect can improve the mechanical properties of a cold-rolled 0.16wt%C-1.3wt%Mn steel containing only 0.4 wt% of silicon. A complete characterisation of the bainite transformation and of the resulting microstructures, tensile properties and mechanical stability of retained austenite has allowed the determination of the factors responsible for the enhanced balance of strength and ductility of this steel well adapted for automotive applications.KEY WORDS: high strength steels; retained austenite; TRIP and multiphase steels; bainite transformation; mechanical properties.

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Section: Methodsmentioning

confidence: 99%

The Developments of Cold-rolled TRIP-assisted Multiphase Steels. Low Silicon TRIP-assisted Multiphase Steels.

Jacques

Girault

Harlet³

et al. 2001

ISIJ International

Self Cite

114

View full text Add to dashboard Cite

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“…The Vickers hardness tester was used to measure the Vickers hardness with 10-kg load. The microstructures of the transverse section of the specimens were examined with an optical microscopy (OM) after a LePera etching 14 and with a scanning electron microscopy (SEM) after conventional 4% Nital etching. Thin specimens were observed in a transmission electron microscopy (TEM) with energy dispersive spectrometry (EDS) facility.…”

Section: Methodsmentioning

confidence: 99%

The Analysis of the Microstructure and Mechanical Properties of Low Carbon Microalloyed Steels after Ultra Fast Cooling

Tian

Wang

et al. 2017

Mat. Res.

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In this paper, two low carbon microalloyed steels, named as steel A and steel B, were fabricated by ultra fast cooling (UFC). In both steels, the microstructures containing quasi polygonal ferrite (QF), acicular ferrite (AF) and granular bainite (GB) can be obtained by UFC process. The amount of AF in steel B is more than that in steel A. The size and distribution of precipitates (Nb/Ti carbonitrides) in steel B are finer and more dispersed than those of in steel A due to relatively low finish cooling temperature. The mechanical properties of both steels are effectively enhanced by UFC process. UFC process produces low-temperature transformation microstructures containing a significant amount of AF. The mechanical properties of steel B were more satisfactory than those of steel A due to the finer average grain size, the greater amount of the volume fractions and smaller size of secondary phases.

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“…Microstructural study was done on samples intermptedly quenched during the thermal cycle. As presented elsewhere [3], a particular sample preparation was carried out prior to SEM observations. The amount of retained austenite on steel A was measured by X-ray diffraction from the integrated intensities of diffraction peaks (200)y, (220)y, (311)y, (200)a, (211)a, and (220)a using Cu K a radiation [4].…”

Section: Methodsmentioning

confidence: 99%

Experimental Characterisation of the Bainitic Transformation Kinetics of Residual Austenite in Mn-Si TRIP-Assisted Multiphase Steels

et al. 1997

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Abstract. Recent studies on TRIP-assisted multiphase steels have emphasised the drastic importance of the bainitic transformation in the optimisation of properties. Bainitic ageing is necessary for the stabilisation of austenite with respect to the martensitic transformation. This metastable retained austenite can still transform to martensite when plastically deformed (TRIP effect). The present work deals with the bainitic reaction kinetics of the austenite obtained by intercritical annealing in two low carbon Mn-Si steels. Bainitic transformation was followed by dilatometry and SEM observations. X-ray diffraction and Mossbauer spectrometry allowed the measurement of the amount of residual austenite and of the carbon enrichment in austenite. The tempering temperature was found to influence the kinetics of austenite transformation and decomposition.

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Metallographic Methods for Revealing the Multiphase Microstructure of TRIP-Assisted Steels

Cited by 225 publications

References 8 publications

The Developments of Cold-rolled TRIP-assisted Multiphase Steels. Low Silicon TRIP-assisted Multiphase Steels.

The Developments of Cold-rolled TRIP-assisted Multiphase Steels. Low Silicon TRIP-assisted Multiphase Steels.

The Analysis of the Microstructure and Mechanical Properties of Low Carbon Microalloyed Steels after Ultra Fast Cooling

Experimental Characterisation of the Bainitic Transformation Kinetics of Residual Austenite in Mn-Si TRIP-Assisted Multiphase Steels

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