Mechanical stability of individual austenite grains in TRIP steel studied by synchrotron X-ray diffraction during tensile loading

Blondé, R.; Jimenez-Melero, Enrique; Zhao, L.; Wright, Jonathan P.; Brück, E.; Zwaag, Sybrand van der; Dijk, NH van

doi:10.1016/j.msea.2014.09.008

Cited by 51 publications

(31 citation statements)

References 41 publications

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“…It has also already been shown in previous works that the transformation stability of RA is affected by many factors, among other its morphology [38,39]. The largest "blocky type" austenite grains usually show a relatively low mechanical stability during tensile testing [40,41]. This morphology tends to transform to martensite under a small strain and contributes little to the TRIP effect [8,38,42,43], as it is 'consumed' during the early stage of plastic deformation [9,44].…”

Section: Microstructure Of the Qandp Processed Steels Before Cyclic Defmentioning

confidence: 89%

“…It should be noted that Q&P processing leads to formation of a very complex multi-phase microstructure, where there are numerous other factors affecting transformation stability of RA, such as the carbon concentration in the RA grains [25,41], the constraining effect of the surrounding phases [54], etc. The stability of a given RA grain is always determined by interplay of all those factors, and it is an extremely complicated task to determine the contribution of each individual factor [44].…”

Section: Effect Of Crystallographic Orientation Of Ra On Its Stabilitmentioning

confidence: 99%

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Effect of microstructure on fatigue behavior of advanced high strength steels produced by quenching and partitioning and the role of retained austenite

Diego-Calderón

Calvillo

Lara

et al. 2015

Materials Science and Engineering: A

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Section: Microstructure Of the Qandp Processed Steels Before Cyclic Defmentioning

confidence: 89%

Section: Effect Of Crystallographic Orientation Of Ra On Its Stabilitmentioning

confidence: 99%

Effect of microstructure on fatigue behavior of advanced high strength steels produced by quenching and partitioning and the role of retained austenite

Diego-Calderón

Calvillo

Lara

et al. 2015

Materials Science and Engineering: A

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“…In fact, similar behaviour has also been reported (De Diego-Calderón et al, 2014;De Knijf et al, 2014a) in Q&P steels. It has also been already shown in literature that transformation stability of austenite is affected by many factors, among others the carbon concentration in the austenite grains (van Dijk et al, 2005;Blondé et al, 2014), its grain size (Jimenez-Melero et al, 2007), the constraining effect of the surrounding phases (Jacques et al, 2001a) and its morphology (Xiong et al, 2013). In our case, carbon content, grain size and the surrounding phases of RA (fractions of TM and UM) are very similar for the 224-350-500, 244-350-500 and 264-350-500 samples.…”

Section: Influence Of Qtmentioning

confidence: 91%

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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“…The higher stability of HT2I steel could be attributed, among other factors, to a more efficient carbon partitioning from bainite to austenite and, therefore, carbon enrichment of RA during the isothermal holding at the BIT stage . Moreover, the larger RA particles of HT3I steel along with the higher M s σ temperature may explain the reduced mechanical stability against transformation compared with HT2I steel, since the stability of RA is controlled not only by the local carbon level but also by the RA grain size . In the investigation, the morphology of RA has been taken into account by examination of the RA‐grain aspect ratio.…”

Section: Mechanical Behavior and Ra Transformationmentioning

confidence: 99%

Effect of retained austenite stability on cyclic deformation behavior of low‐alloy transformation‐induced plasticity steels

Christodoulou

Kermanidis

Haidemenopoulos

et al. 2019

Fatigue Fract Eng Mat Struct

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The retained austenite (RA) characteristics of Al‐containing TRIP700 steels have been manipulated using varying bainitic isothermal transformation (BIT) processing. The microstructural evolution was investigated using optical microscopy and quantitative image analysis, while the amount of transformed RA was evaluated with the saturation magnetization (SM) technique. Cyclic behavior is found to depend on the applied strain amplitude and stability of RA. At strain amplitudes with comparable elastic and plastic strain components, cyclic softening prevails, facilitated by more stable RA microstructures and Low Cycle Fatigue (LCF) performance benefits from a lower RA stability, which controls the amount of cyclic softening rate. With increasing plastic strain component, a transition to cyclic hardening is observed, and the transition strain increases with increasing RA stability. LCF performance deteriorates because of excessive cyclic strain hardening promoting martensitic transformation. The effect is accompanied by a transition from mixed dimple/cleavage to cleavage‐type fracture characteristics.

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Mechanical stability of individual austenite grains in TRIP steel studied by synchrotron X-ray diffraction during tensile loading

Cited by 51 publications

References 41 publications

Effect of microstructure on fatigue behavior of advanced high strength steels produced by quenching and partitioning and the role of retained austenite

Effect of microstructure on fatigue behavior of advanced high strength steels produced by quenching and partitioning and the role of retained austenite

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

Effect of retained austenite stability on cyclic deformation behavior of low‐alloy transformation‐induced plasticity steels

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