Crystallographic Analysis of Isothermally Transformed Bainite in 0.2C–2.0Mn–1.5Si–0.6Cr Steel Using EBSD

Suikkanen, Pasi; Cayron, Cyril; DeArdo, A. J.; Karjalainen, L.P.

doi:10.1016/j.jmst.2013.01.015

Cited by 46 publications

(20 citation statements)

References 28 publications

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“…The scatter of nanohardness distribution in LB is larger than other ferritic phases (Figure 3b). This may be due to the hierarchy structure of LB [25] and possibly a locally inhomogeneous dislocation density. However, the scatter of nanohardness distribution in LB is smaller than that in lath martensite.…”

mentioning

confidence: 99%

On the nanoindentation behaviour of complex ferritic phases

Zhu

Huang

2014

Philosophical Magazine Letters

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mentioning

confidence: 99%

On the nanoindentation behaviour of complex ferritic phases

Zhu

Huang

2014

Philosophical Magazine Letters

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“…This gives less hard impingement and as a result these variants are preferred for growth. The findings of Suikkanen et al 47 support this assertion. Thus, where there is variant selection due to application of external stress and/or strain there is a tendency for more variants to form from one Bain group.…”

Section: Effect Of Variant Selection On Microstructure and Propertiesmentioning

confidence: 84%

CRITICAL ASSESSMENT 1: Outstanding issues in crystallographic variant selection in displacive transformations

Kundu

2014

Materials Science and Technology

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Variant selection has been a well researched subject in metallurgy and materials science in recent decades. The emergence of experimental techniques capable of determining crystallographic orientation at the grain level has provided insight into the fundamental processes underlying variant selection. The theory, however, is far from complete. Fundamental questions, such as the specific roles of stress and strain in variant selection, have yet to be fully resolved. It remains unclear whether variant selection is a nucleation controlled phenomenon or growth controlled. The possibility of using unconventional forces such as magnetic or electrical fields to influence variant selection is of interest, but needs further research. Any phenomenon related to phase transformation gains importance only when it can be controlled to improve material properties, and it is still unclear how variant selection can be applied to this end. The literature is critically assessed and an attempt is made to identify areas for future research with potential to allow effective application of variant selection.

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“…Overall texture intensity of AIR-steel was higher rather than ACC-steel due to the formation of {110}//RD grains accompanied by banded microstructure. Suikkanen et al [40] characterized a {110} plane of the carbide-free bainitic ferrite similar to the martensitic transformation originated from close-packed {111} austenite plane because of the accommodation of transformation strains, enhancing the bainitic transformation. The formation of (211)[011] component could be explained by Shackleton and Kelly works which reported that the habit plane of cementite in lower bainitic ferrite is corresponding to { 001 } // { 211 } [41].…”

Section: Crystallographic Texturementioning

confidence: 99%

Effect of Textures and Microstructures on the Occurrence of Delamination during and after Fracture Toughness Tests of API X80 Steel Plates

Conde¹,

Pinto²,

Masoumi³

et al. 2020

Strength of Materials

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The API 5 L X80 is a high strength microalloyed steel, widely used in the gas and oil industry to fabricate pipelines. This steel presents a combination of elevated strength and toughness. In the present investigation, the microstructural features, fracture toughness and delamination occurrence of two X80 grade steel plates with different processing routes and chemical composition were studied. The first steel depicted a homogenous bainitic matrix and the second steel exhibited a banded microstructure composed of elongated ferrite grains, with macrosegregation in the mid-plane of the plates. Fracture toughness tests were conducted for both steels on 7-mm and 15-mm thick samples. The orientation distribution functions analysis revealed crystallographic intensity distribution of the austenite to ferrite transformation texture, especially the alpha-fiber (< 011 > || rolling direction) which explained the anisotropy and delamination occurrences. Both processed plates of steel presented the alpha-fiber due to hot-rolling of plates. Delaminations occurrences were further investigated and attributed to a strong {100} <011> orientation presence despite microstructure homogeneity. A schematic model was proposed, showing the source of delamination and the reason for the lowest toughness for 45° to the rolling direction.

show abstract

Crystallographic Analysis of Isothermally Transformed Bainite in 0.2C–2.0Mn–1.5Si–0.6Cr Steel Using EBSD

Cited by 46 publications

References 28 publications

On the nanoindentation behaviour of complex ferritic phases

On the nanoindentation behaviour of complex ferritic phases

CRITICAL ASSESSMENT 1: Outstanding issues in crystallographic variant selection in displacive transformations

Effect of Textures and Microstructures on the Occurrence of Delamination during and after Fracture Toughness Tests of API X80 Steel Plates

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