Characterization of the microstructure obtained by the quenching and partitioning process in a low-carbon steel

Santofimia, M.J.; Zhao, L.; Petrov, Roumen; Sietsma, Jilt

doi:10.1016/j.matchar.2008.04.004

Cited by 144 publications

(81 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…'Dynamic stabilisation' of austenite may occur during quenching, 33 associated with carbon partitioning from martensite during cooling or carbon enrichment of austenite during epitaxial ferrite growth upon cooling after intercritical annealing. 14,15,34,35 Quenching to room temperature or perhaps to an intermediate temperature below M s for Q&P may also produce carbon clustering in the martensite, setting the initial microstructural condition for subsequent tempering or partitioning reactions. 36 In situ neutron diffraction during heating to the partitioning temperature at a lower rate than typically encountered in other Q&P studies revealed reductions of bct and bcc martensite lattice parameters, without commensurate austenite lattice parameter increases, suggesting that a significant amount of carbon was unavailable for partitioning to the austenite, presumably due to carbon trapping at energetically favourable sites (e.g.…”

Section: Austenite/martensite Interfacial Migration and Martensite Tementioning

confidence: 99%

Critical Assessment 7: Quenching and partitioning

Speer

Moor

Clarke

2015

Materials Science and Technology

134

View full text Add to dashboard Cite

Quenching and partitioning is a relatively new heat treatment concept to generate microstructures containing retained austenite stabilised by carbon partitioning from martensite. Research on quench and partitioning has been conducted by numerous groups, and this critical assessment provides some of the authors’ perspectives on progress and understanding in the field, with particular focus on the physical metallurgy and transformation mechanisms, process variations, mechanical behaviour, and industrial implementation. While much progress has been made, the field provides rich opportunity for further understanding and development.

show abstract

Section: Austenite/martensite Interfacial Migration and Martensite Tementioning

confidence: 99%

Critical Assessment 7: Quenching and partitioning

Speer

Moor

Clarke

2015

Materials Science and Technology

134

View full text Add to dashboard Cite

show abstract

“…In particular, the past few decades have witnessed a significant research effort directed towards the development of Advanced High-Strength Steel (AHSS) grades, as they provide an opportunity for the development of cost-effective and light-weight parts with improved safety and optimized environmental performance for automotive applications (Bhadeshia, 1999;De Moor et al, 2010;Caballero et al, 2013;Rodríguez et al, 2014). These research strategies are based on the development of microstructures consisting of ultrafine microconstituents formed in non-equilibrium conditions, such as martensite or bainite, in combination with Retained Austenite (RA) (Santofimia et al, 2008;Caballero et al, 2009;Garcia-Mateo et al, 2012). Harder microconstituents contribute to a simultaneous increase of strength and toughness whereas RA provides the improvement of strength and ductility through the Transformation Induced Plasticity (TRIP) effect (Speer et al, 2005;Santofimia et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…These research strategies are based on the development of microstructures consisting of ultrafine microconstituents formed in non-equilibrium conditions, such as martensite or bainite, in combination with Retained Austenite (RA) (Santofimia et al, 2008;Caballero et al, 2009;Garcia-Mateo et al, 2012). Harder microconstituents contribute to a simultaneous increase of strength and toughness whereas RA provides the improvement of strength and ductility through the Transformation Induced Plasticity (TRIP) effect (Speer et al, 2005;Santofimia et al, 2008). The strain induced transformation to martensite provides an additional deformation and strainhardening mechanism, thereby suppressing strain localization and enhancing formability (Speer and Matlock, 2002;Gutiérrez et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Effect of Q&P parameters on microstructure development and mechanical behaviour of Q&P steels

Diego-Calderón¹,

Knijf²,

Molina-Aldareguia³

et al. 2015

REVMETAL

View full text Add to dashboard Cite

Steel with a nominal composition of 0.25C-1.5Si-3Mn-0.023Al (mass %) was subjected to Quenching and Partitioning (Q&P) with varying parameters (quenching temperature, partitioning temperature and partitioning time) resulting in formation of multi-phase microstructure, which was thoroughly studied using X-ray (XRD) and Electron Backscatter Diffraction (EBSD). Mechanical properties of the Q&P steel were measured by tensile tests. Plastic deformation of Q&P steel at micro-scale was investigated by in situ tensile testing and digital image correlation analysis. The effect of Q&P parameters on the microstructure (phase composition, size and volume fraction of micro constituents, texture and carbon content in retained austenite) is discussed. After analyzing the mechanical properties, plastic deformation at the micro-scale and the microstructure, it is shown that the strain partitioning between phases strongly depends on the microstructure of the Q&P steel, which, in turn, can be tuned via manipulation with Q&P parameters. RESUMEN: Efecto de los parámetros de procesado en el desarrollo microestructural y en las propiedades mecánicas en aceros Q&P.Con el objetivo de evaluar el efecto de los parámetros de procesado en un acero con una composición nominal de 0,25C-1,5Si-3Mn-0,023Al (% masa), éste ha sido sometido a un tratamiento térmico denominado "Quenching and Partitioning" (Q&P), en el que se han variado la temperatura de "quenching", la temperatura de "partitioning" y el tiempo de "partitioning". Como resultado se ha obtenido una microestructura multifásica, la cual ha sido analizada en detalle utilizando difracción de rayos-X (XRD) y de electrones retrodispersados (EBSD). Asimismo, se han medido las propiedades mecánicas de los aceros Q&P mediante ensayos de tracción. La deformación plástica de los aceros Q&P a nivel micrométrico ha sido estudiada mediante ensayos "in situ" en el microscopio electrónico de barrido y la posterior aplicación de la técnica de correlación digital de imágenes. Se ha determinado el efecto de los parámetros de procesado en la microestructura (composición de fases, tamaño y fracción en volumen de los distintos micro constituyentes, textura y contenido en carbono en la austenita retenida). Una vez se han relacionado las propiedades mecánicas, la deformación plástica a nivel micrométrico y la microestructura, se concluye que la partición de la deformación entre fases depende en gran medida de la propia microestructura del acero Q&P, que a su vez puede ser ajustada a través de la manipulación de los parámetros de procesado.

show abstract

“…Only the magnetic measurements are applicable to bulk specimens without prior preparation. Moreover, none of the methods is used at elevated temperatures, direct evidence on the microstructure evolution during the processing is hence lacking so far [14,15]. In the present work the in situ characterization of heat treatment processes by diffraction experiments with high--energy synchrotron radiation is discussed.…”

Section: Introductionmentioning

confidence: 96%

Monitoring of Heat Treatment Processes by High Energy Synchrotron Radiation

et al. 2012

View full text Add to dashboard Cite

Advanced engineering materials are frequently based on multiphase microstructures, where the decisive step is the heat treatment adjusting the desired microstructure. A typical example are transformation-induced plasticity assisted steels, where the steel grades depend on the phase composition and the deformation-induced transformation of retained austenite into martensite. Usually methods for microstructural characterization are only applied after completion of the heat treatment process and comprise typically microscopy and X-ray analysis with laboratory tubes. Both methods can suffer from artefacts and probe a relatively small surface or volume, respectively. However, in the last decade synchrotron facilities have become available that offer very hard X-rays, which open up new possibilities for the observation of heat treatment processes owing to the unique combination of extremely high intensities with large penetration depths (mm scale). Sophisticated sample environments allow for complex in situ experiments, currently with a time resolution on the order of seconds. Only recently a commercial dilatometer of type Bähr Dil805AD has become available at the HARWI-2 beamline at the HASYLAB. This experimental setup was used for the in situ investigation of the quenching and partitioning process in transformation-induced plasticity steels. The experiments were performed in transmission at a wavelength of 0.0124 nm. The Debye-Scherrer rings were observed arising from statistical grain distributions characteristic for each microstructure. The time-resolved measurements allow conclusions about the phases present in the sample, their lattice parameters, texture and grain size.

show abstract

Characterization of the microstructure obtained by the quenching and partitioning process in a low-carbon steel

Cited by 144 publications

References 13 publications

Critical Assessment 7: Quenching and partitioning

Critical Assessment 7: Quenching and partitioning

Effect of Q&P parameters on microstructure development and mechanical behaviour of Q&P steels

Monitoring of Heat Treatment Processes by High Energy Synchrotron Radiation

Contact Info

Product

Resources

About