Critical Assessment 7: Quenching and partitioning

Speer, John G.; Moor, Emmanuel De; Clarke, Amy J.

doi:10.1179/1743284714y.0000000628

Cited by 136 publications

(68 citation statements)

References 94 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Addition of elements, such as Si, retards the formation of carbides and gives rise to the carbon enrichment of austenite (Santofimia et al, 2008;Paravicini Bagliani et al, 2013). Moreover, increased manganese levels have been shown to be effective at reporting significant austenite fractions with improved tensile properties in Q&P steels (De Moor et al, 2011;Speer et al, 2014). Mechanical property studies indicate that Q&P shows significant potential to generate novel property combinations that would otherwise be difficult in low alloy compositions (Speer et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, increased manganese levels have been shown to be effective at reporting significant austenite fractions with improved tensile properties in Q&P steels (De Moor et al, 2011;Speer et al, 2014). Mechanical property studies indicate that Q&P shows significant potential to generate novel property combinations that would otherwise be difficult in low alloy compositions (Speer et al, 2014). Fundamental understanding of the property -microstructure relationships in this type of steels has not been achieved, which is required for further improvement of the properties via intelligent microstructural design.…”

Section: Introductionmentioning

confidence: 99%

“…Although there are already works on characterization of the steel microstructure after Q&P (Santofimia et al, 2008;De Diego-Calderón et al, 2014;De Knijf et al, 2014a;Tan et al, 2014a;Tan et al, 2014b), there is still a lack of knowledge about the strain distribution between the microstructural constituents in Q&P structures during loading in the plastic range. Low carbon TRIP steel compositions have been used to successfully generate martensitic microstructures with substantial RA levels through Q&P processing (Speer et al, 2014). Addition of elements, such as Si, retards the formation of carbides and gives rise to the carbon enrichment of austenite (Santofimia et al, 2008;Paravicini Bagliani et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

show abstract

“…leads to unique mechanical properties. The martensite and bainite constituents contribute to an increase of strength, whereas RA provides an improvement of ductility [1]. The microstructural heterogeneity results also in significant stress and strain partitioning among the micro-constituents during plastic deformation.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Analysis and Mechanical Properties of Low Alloy High Strength Quenched and Partitioned Steel

Forouzan

Gunasekaran

Hedayati

et al. 2016

SSP

View full text Add to dashboard Cite

Abstract. Gleeble study of the quenching and partitioning (Q&P) process has been performed on Domex 960 steel (Fe, 0.08 %C, 1.79 %Mn, 0.23 %Si, 0.184 %Ti, and 0.038 %Al). The effect of different Q&P conditions on microstructure and mechanical properties were investigated. The aim of the process is to produce a fine grained microstructure for better ductility and controlled amounts of different micro-constituents to increase the strength and toughness simultaneously. Three different quenching temperatures, three partitioning temperatures and three partitioning times have been selected to process the 27 specimens by Gleeble® 1500. The specimens were characterized by means of OM, SEM, XRD, hardness and impact tests. It was found that, fine lath martensite with retained austenite is achievable without high amount of Si or Al in the composition although lack of these elements may cause the formation of carbides and decrease the available amount of carbon for partitioning into the austenite. The hardness increases as the quenching temperature is decreased, however, at highest partitioning temperature (640 • C) the hardness increases sharply due to extensive precipitate formation.

show abstract

“…25 Since then, synchrotron X-ray studies of the same have been reported 26 where it is found that carbon first partitions from martensite to austenite during tempering -this, of course, is a widely known phenomenon, 27 reflected also in the design of quenching and partitioning steels. 28 Lejay et al 29 now report results from a combination of synchrotron X-ray analysis and dilatometry where they characterise the dimensional changes and relate them to phase fractions, accounting for the measured lattice parameter changes.…”

Section: H K D H Bhadeshiamentioning

confidence: 99%

Recent developments in bearing steels

Bhadeshia

2016

Materials Science and Technology

View full text Add to dashboard Cite

Critical Assessment 7: Quenching and partitioning

Cited by 136 publications

References 94 publications

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

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

Microstructure Analysis and Mechanical Properties of Low Alloy High Strength Quenched and Partitioned Steel

Recent developments in bearing steels

Contact Info

Product

Resources

About