Carbon partitioning to austenite from martensite or bainite during the quench and partition (Q&amp;P) process: A critical assessment

Clarke, Amy J.; Speer, John G.; Miller, M.K.; Hackenberg, Robert E.; Edmonds, David; Matlock, David K.; Rizzo, F.; Clarke, Kester D.; Moor, Emmanuel De

doi:10.1016/j.actamat.2007.08.051

Cited by 372 publications

(196 citation statements)

References 16 publications

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“…From an annealing process control perspective, it should be recognised that some Q&P thermal signatures may require careful control of both the quenching and partitioning temperatures, which may be mitigated through alloying in some instances, in comparison to conventional dual-phase and carbide-free bainitic TRIP steels where the overaging or austempering temperature is most critical, although some early modeling and experimental results suggest less sensitivity to quench temperature than initially expected. 9,10,19 Complex microstructures envisioned for the future will require continued efforts to minimise variability, and perhaps facility developments tailored specifically to overcome the sensitivity of microstructure and properties to process variations. Specific sensitivities are also dependent on the particular metallurgical approach of interest, creating further complications and opportunities.…”

Section: Industrial Implementationmentioning

confidence: 99%

“…Theoretical calculations informed by atom probe tomography (APT) and X-ray diffraction suggest that carbon partitioning from martensite to austenite better explains experimental austenite fractions, rather than solely bainite formation during the partitioning step. 19 In lieu of direct experimental evidence of carbon partitioning to austenite from martensite in low alloy compositions, high alloy compositions designed to suppress M s temperature and bainite formation now afford studies of austenite/martensite mixtures during the quenching and partitioning steps. Austenite and martensite/ferrite lattice parameter changes and phase fractions in a 0?64C-4?57Mn-1?30Si (wt-%) alloy after quenching and during the partitioning step have been monitored by in situ neutron diffraction, and austenite lattice dilations during partitioning support the mechanism of carbon partitioning to austenite from initially carbon supersaturated martensite.…”

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confidence: 99%

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Critical Assessment 7: Quenching and partitioning

Speer

Moor

Clarke

2015

Materials Science and Technology

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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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Section: Industrial Implementationmentioning

confidence: 99%

mentioning

confidence: 99%

Critical Assessment 7: Quenching and partitioning

Speer

Moor

Clarke

2015

Materials Science and Technology

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134

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“…Studies conducted by several researchers 3,4 proved the possibility of achieving fractions of retained austenite through quenching and partitioning heat treatments in silicon containing steels. In these studies, it was possible to observe the dependence between the fractions of retained austenite (as well as its final carbon content) and the heat treatment conditions.…”

Section: Introductionmentioning

confidence: 99%

Quenching and partitioning heat treatment in ductile cast irons

Silva¹,

Goldenstein

Guesser

et al. 2014

Mat. Res.

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A commercial ductile iron alloy was submitted to a quenching and partitioning heat treatment. Samples were austenitized at 900 °C for two hours, quenched at 160 °C and kept at this temperature for 2 minutes and finally were re-heated at temperatures between 300 and 450 °C during time intervals between 2 and 180 minutes. The microstructural evaluation was performed with SEM and X-ray diffraction and the mechanical properties were measured using tensile strength and Charpy tests. In general, the quenching and partitioning treatment is viable to achieving expressive fractions of retained austenite in ductile cast irons. Generally, higher partitioning temperatures produce a higher fraction of retained austenite after shorter times. This behavior can be explained by the increase on diffusion rate of carbon at higher temperatures. For all tested conditions it was possible to see a well-defined process window and the combination of mechanical properties is very similar to the austempered ductile irons.

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“…A taxa de deformação nominal em ambos os casos foi de 0,5 s -1 , o que está dentro da faixa das taxas de deformação encontradas durante ensaios convencionais de estampagem a quente [3]. Os parâmetros posteriores de têmpera e partição, realizados após austenitização intercrítica (QP -Figura 2c) ou deformação (HSQP -Figura 2d), de temperatura de têmpera (QT), tempo de têmpera (Qt), temperatura de partição (PT) e de tempo de partição (Pt), estão baseados no trabalho de Clarke et al [4]. O trabalho desses autores foi realizado em um aço TRIP de composição similar ao aço em estudo e, mostrou, após avaliação do processo de têmpera e partição com dois patamares (ou de dois steps, como é comumente encontrado na literatura), que temperaturas de têmpera na faixa dos 200°C aos 260°C (mantidos por 10s), e tempos de partição de 10, 30, 100 e 1000s (todos realizados com PT=400°C), que a maior fração de austenita foi obtida para as temperaturas de têmpera de 260°C e 240°C com tempos de partição 100 s e 30s, respectivamente.…”

Section: Materiais E Métodosunclassified

Avaliação Das Propriedades Mecânicas Para Um Aço Trip Submetido Aos Processos De Têmpera E Partição E Estampagem a Quente

Echeverri¹,

Nishikawa²,

Goldenstein³

et al. 2018

ABM Proceedings

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ResumoO aumento das exigências para reduzir o consumo de combustível e aumentar a segurança dos passageiros tem estimulado o desenvolvimento da nova geração de aços de alta resistência. Esses objetivos tornam-se atingíveis com a redução do peso dos componentes de aço do veiculo, pelo uso de chapas mais finas e resistentes, mas não menos dúcteis. Com esse propósito, no presente trabalho pretendeu-se analisar os efeitos de diferentes rotas de processamento: estampagem a quente, têmpera e partição e o inovador processo que combina a deformação a quente com a têmpera e partição. Os ciclos térmicos foram projetados para obter a maior fração de austenita retida, além de ferrita e martensita. Para cada amostra tratada, amostras de tração de tamanho reduzido foram extraídas de amostras previamente tratadas em simulador termomecânico avançado Gleeble 3S50. A microestrutura foi analisada por microscopia óptica e eletrônica de varredura. Com o novo processo combinado acredita-se que seja possível atingir uma boa associação de propriedades para a nova geração de aços de alta resistência pela transformação da austenita retida metaestável em martensita induzida por deformação, contribuindo para a absorção de energia durante impacto. Palavras-chave: Estampagem a Quente; Têmpera e Partição, aço TRIP. EVALUATION OF THE MECHANICAL PROPERTIES OF A TRIP-STEEL TREATED BY QUENCHING AND PARTITIONING AND HOT STAMPING PROCESSES AbstractIncreased requirements for low fuel consumption and improved safety in the automotive industry have stimulated the development of new generations of high strength steels. To reduce fuel consumption, weight reduction of the steel car body is required by using thinner and therefore stronger but not less ductile materials. With this purpose, the present work aims to analyze the effect of different processing routes: hot stamping, quenching and partitioning and a novel combined process of hot stamping and quenching and partitioning. The thermal cycles have been designed in order to obtain the maximum fraction of retained austenite combined with ferrite and martensite after the process. From each heat treated specimen, subsize tensile specimens were extracted from the samples previously treated in an advanced thermomechanical simulator Gleeble 3S50. The microstructure was analyzed by optical and SEM. The newly developed combined process is believed to be a promising heat treatment for the new generation of AHSS, given that metastable retained austenite is beneficial due to occurrence of TRIP phenomenon during deformation, contributing to impact energy absorption.

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Carbon partitioning to austenite from martensite or bainite during the quench and partition (Q&P) process: A critical assessment

Cited by 372 publications

References 16 publications

Critical Assessment 7: Quenching and partitioning

Critical Assessment 7: Quenching and partitioning

Quenching and partitioning heat treatment in ductile cast irons

Avaliação Das Propriedades Mecânicas Para Um Aço Trip Submetido Aos Processos De Têmpera E Partição E Estampagem a Quente

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