Further evidence of tetragonality in bainitic ferrite

Hulme-Smith, Christopher; Peet, M. J.; Lonardelli, I.; Dippel, Ann Christin; Bhadeshia, H. K. D. H.

doi:10.1179/1743284714y.0000000691

Cited by 40 publications

(29 citation statements)

References 17 publications

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“…[38] More recently, the possibility has been investigated using density functional calculations that tetragonality of the bainitic ferrite may also act to stabilize the high carbon content. [39] This is the topic of continuing investigations using synchrotron radiation [40,41] and neutron diffraction.…”

Section: Resultsmentioning

confidence: 99%

Tempering of Low-Temperature Bainite

Peet

Babu

Miller

et al. 2017

Metall Mater Trans A

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Electron microscopy, X-ray diffraction, and atom probe tomography have been used to identify the changes which occur during the tempering of a carbide-free bainitic steel transformed at 473 K (200 °C). Partitioning of solute between ferrite and thin-films of retained austenite was observed on tempering at 673 K (400 °C) for 30 minutes. After tempering at 673 K (400 °C) and 773 K (500 °C) for 30 minutes, cementite was observed in the form of nanometre scale precipitates. Proximity histograms showed that the partitioning of solutes other than silicon from the cementite was slight at 673 K (400 °C) and more obvious at 773 K (500 °C). In both cases, the nanometre scale carbides are greatly depleted in silicon.

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Section: Resultsmentioning

confidence: 99%

Tempering of Low-Temperature Bainite

Peet

Babu

Miller

et al. 2017

Metall Mater Trans A

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“…59,61 There is also the contribution of the dislocation density and that of the Cottrell atmospheres, 59,62,63 as well as an important strengthening due to the solid solution of C in both ferrite and austenite. 64 The fact that nanostructured bainitic ferrite is tetragonal 30,38,52,65,66 allows it to accommodate a bigger amount of C in solid solution, 0.18 wt.%, when compared with the cubic structure. Therefore, its contribution to strength must be not inconsiderable.…”

Section: Nanostructure In Low-temperature Bainitic Steelmentioning

confidence: 99%

“…In a similar manner and given the recent findings, the lattice parameter of bainitic ferrite was calculated assuming that in these nanostructured bainitic steels, this phase has a tetragonal structure. 38,39 Thus, the C content of bainitic ferrite (X a ) was calculated as function of the tetragonal lattice parameters, a a and c a , according to the wellknown expression c a /a a = 1 + 0.045X a . 30,40,41 Further details on the setting of the XRD experiments and data treatment can be found in Ref.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Tensile Response of Two Nanoscale Bainite Composite-Like Structures

Morales-Rivas

Yen

Huang

et al. 2015

JOM

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The present work is concerned with the study of the relationship between microstructure and ductility of nanostructured bainite. The tensile behavior of two steels treated at the same temperature during different times has been analyzed. Special attention has been paid to the role that the retained austenite mechanical stability plays in enhancing the ductility through its contribution to the work-hardening and the damage resistance of these materials. The results have shown that the relative mechanical properties of the phases present affect both the martensitic transformation behavior and the total elongation.

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“…Fe-1.037C-3.89Si-1.97Mn-0.24Mo-1.43Al (wt-%) 54 have also shown a better fit obtained for the data of the BF lattice when lattice tetragonality is assumed. Anisotropy in thermal expansion along unit cell edges of BF during in situ synchrotron studies was also reported recently.…”

Section: Carbon and Lattice Tetragonalitymentioning

confidence: 73%

Critical assessment 20: On carbon excess in bainitic ferrite

Pereloma

2016

Materials Science and Technology

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For several decades, the question of carbon supersaturation in bainitic ferrite has attracted the attention of physical metallurgists. Originally, this was associated with excess carbon due to the displacive nature of phase transformation and its subsequent trapping at defects in bainitic ferrite. The development of advanced experimental techniques, such as atom probe tomography and in situ synchrotron and neutron X-ray diffraction, has provided new insights into carbon distribution within bainitic ferrite. Possible explanations for carbon excess in solid solution are discussed, and the pathways for the future advancement of this research question are suggested.

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Further evidence of tetragonality in bainitic ferrite

Cited by 40 publications

References 17 publications

Tempering of Low-Temperature Bainite

Tempering of Low-Temperature Bainite

Tensile Response of Two Nanoscale Bainite Composite-Like Structures

Critical assessment 20: On carbon excess in bainitic ferrite

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