Theoretical design and advanced microstructure in super high strength steels

Caballero, Francisca G.; Santofimia, M.J.; García‐Mateo, C.; Chao, Jesús; Andrés, Cristhian

doi:10.1016/j.matdes.2008.08.042

Cited by 171 publications

(90 citation statements)

References 21 publications

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“…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%

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: 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

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“…E-mail: tanqibingmatin@126.com high strength-toughness drilling tool steel was systematic researched. Which was on the basis of study on the effects of rare earth elements in this kind of drilling tool steel sub-structure [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Rare Earth on Isothermal Transformation Kinetics in High Strength-toughness Tool Steel

Tan¹,

Lin²

2017

dtcse

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The effect of rare earth on phase transformation kinetics in new high strength-toughness drilling tool steel during isothermal transformation has been investigated systematically, and the TTT diagrams were obtained. The results show that rare earth improves the value of phase transformation activation energy; The TTT diagrams have been shifted to right and down with the increment of rare earth, and nose temperature decreased from 385℃ to 350℃ in drilling tool steel.

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“…Assim, uma possibilidade de amenizar, senão resolver completamente este problema ocorre pela adição de elementos de liga como silício, o qual na quantidade de 1,5%, em peso, de acordo com alguns trabalhos, pode suprimir a precipitação de cementita a partir da austenita, durante a formação da bainita, desde que a força de arraste para a precipitação seja reduzida quando a cementita absorve parte do silício presente na fase original (6) . Em aços com altos teores de silício (acima de 1%), a microestrutura bainítica é constituída de finas placas de ferrita bainí-tica separadas por regiões de austenita enriquecida com carbono, sendo também possível encontrar a presença parcial de martensita (7,8) . Estes aços recebem a denominação de aços bainíticos livres de carbonetos, e a sua microestrutura, bainítica composta, tem demonstrado ser capaz de atingir a melhor combinação entre resistência e tenacidade, dentre os aços bainíticos que foram desenvolvidos até a atual data e, portanto, apresentando um limite de resistência a tração que varia de 1600 MPa até 1800 MPa, mantendo um alongamento total maior do que 10% (5,9) .…”

Section: Introductionunclassified

Análise microestrutural de um aço AISI 4350 submetido a tratamentos térmicos para a formação de bainita

Nogueira¹,

Abdalla²,

Hashimoto³

et al. 2015

RBAV

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Theoretical design and advanced microstructure in super high strength steels

Cited by 171 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

Effect of Rare Earth on Isothermal Transformation Kinetics in High Strength-toughness Tool Steel

Análise microestrutural de um aço AISI 4350 submetido a tratamentos térmicos para a formação de bainita

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