Microstructural development during the quenching and partitioning process in a newly designed low-carbon steel

Santofimia, M.J.; Zhao, L.; Petrov, Roumen; Kwakernaak, C.; Sloof, W.G.; Sietsma, Jilt

doi:10.1016/j.actamat.2011.06.014

Cited by 275 publications

(112 citation statements)

References 21 publications

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“…Increasing PT can accelerate the carbon partitioning from martensite to austenite (Santofimia et al, 2008). For example, it was reported in Santofimia et al (2011b), that for the same QT and Pt, the maximum RA volume fraction is reached at shorter times for higher PTs, i.e. carbon diffusion during partitioning is controlled more effectively by PT rather than Pt.…”

Section: Influence Of Ptmentioning

confidence: 98%

“…Therefore, after yielding the amount of UM, which contributes to the material's strength, is increased. This martensite will be different to that previously formed as it will normally be expected to inherit a higher carbon concentration (Edmonds et al, 2006;Santofimia et al, 2011b). For this reason, the σ UTS value for the 244-350-500 sample might be the highest one.…”

Section: Influence Of Qtmentioning

confidence: 99%

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

Diego-Calderón¹,

Knijf²,

Molina-Aldareguia³

et al. 2015

REVMETAL

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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.

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Section: Influence Of Ptmentioning

confidence: 98%

Section: Influence Of Qtmentioning

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

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“…Further evidence that the change in lattice parameter is the result of carbon partitioning is supported by literature reports that nickel decreases the austenite lattice parameter. [2][3][4] Nickel is an austenite stabilizer, thus it would tend to partition into austenite (not out of it). Therefore, nickel partitioning into austenite cannot be used to explain the increase in the lattice parameter of austenite.…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

“…The austenite lattice parameter for each sample was calculated based on the positions of the {220}γ and {311}γ peaks. The carbon content of the austenite was estimated using the expression given by Santofimia et al 3) which combines data from van Dijk et al 4) and Dyson and Holmes, 5) and goes as:…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Carbon Atom Re-Distribution during Quenching and Partitioning

et al. 2014

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Quenched and Partitioned (Q&P) steels have been shown in previous literature to exhibit attractive mechanical properties due to austenite and martensite present in the microstructure. However, questions have remained regarding the mechanisms at work during the partition step. In this work, x-ray diffraction and atom probe tomography were utilized to gain insights into phenomena that occur (such as carbon partitioning from martensite to austenite, carbon atom clustering/dislocation trapping, and carbide formation). Evidence of all of these mechanisms was observed.KEY WORDS: quench and partition; carbon diffusion; martensite; austenite; atom probe tomography.

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“…This is because measured dilatometric expansions at low partitioning temperatures during Q&P may signify low interface mobility and little migration, bainitic growth, and/or isothermal martensite formation (below M s ), whereas dilatometric contractions at higher partitioning temperatures may correspond to reduced ferrite growth, austenite growth, and/or martensite tempering effects. 14,24,[27][28][29][30][31] Electron backscatter diffraction of Q&P microstructures has revealed mobile austenite/martensite interfaces that migrate toward martensite in a high Mn steel and stationary interfaces in a high Ni steel (containing plate martensite), 24 suggesting that martensite morphology may influence the partitioning behaviours. Local chemistry variations, such as Mn enrichment in the austenite near the austenite/martensite interface, are also possible after Q&P. 22 Tempering of a maraging TRIP steel at 450uC for 48 h has been found to result in Mn diffusion to the austenite and growth of a new austenite layer adjacent to the existing austenite, 32 which could presumably affect mechanical properties.…”

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

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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.

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Microstructural development during the quenching and partitioning process in a newly designed low-carbon steel

Cited by 275 publications

References 21 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

Carbon Atom Re-Distribution during Quenching and Partitioning

Critical Assessment 7: Quenching and partitioning

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