A New Iron Boro-carbide

Carroll, K. G.; Darken, L. S.; Filer, E. W.; Zwell, L.

doi:10.1038/174978a0

Cited by 39 publications

(9 citation statements)

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“…Accordingly, the observed borocarbides are iron-borocarbides Fe23(B,C)6 , this is in good agreement with what had been reported by other investigators [1,6,7]. Boron stabilises the hypothetical phase FeEaC 6 which would be isomorphous of Mn23C 6 and Cr23C 6 carbides [6]. A size histogram of Fe 23 (B, C)6 precipitates was drawn from our observations on thin foils, giving an average diameter of 0.7 #m. These iron-borocarbides Fe23(B,C)6 are still observed in samples austenitized at 850 ~ in the form of rather coarse intragranular spherical particles.…”

Section: Dissolution Of Boron In Austenite A) Microstructural Charactsupporting

confidence: 93%

“…Energy dispersive X-ray spectra indicate that the metallic fraction M is in fact Fe. Accordingly, the observed borocarbides are iron-borocarbides Fe23(B,C)6 , this is in good agreement with what had been reported by other investigators [1,6,7]. Boron stabilises the hypothetical phase FeEaC 6 which would be isomorphous of Mn23C 6 and Cr23C 6 carbides [6].…”

Section: Dissolution Of Boron In Austenite A) Microstructural Charactsupporting

confidence: 89%

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Microprecipitation in boron-containing high-carbon steels

Lanier¹,

Métauer²,

Moukassi³

1994

Mikrochim Acta

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Abstract. The dissolution and precipitation of boron have been studied in a high-carbon steel. Boron was found in different states: boron oxides, boron carbonitrides and iron-borocarbides Fe23(B,C)6. The dissolution of ironborocarbides in austenite is complete at 1100 ~ and precipitation along 7 grain boundaries of this boron-bearing phase was observed after water-quenching from high austenitizing temperature. Therefore, boron precipitates along 7 grain boundaries before pearlite nucleation.Key words: boron, carbon steel, borocarbides.Boron is an important microalloying element in steels because even small quantities can have a strong effect. This effect has been studied mainly in low-carbon steels in which it is well known that boron retards the nucleation of ferrite and bainite and thereby increases hardenability [1,2]. It is generally agreed that the effect of boron on hardenability results from a segregation of boron atoms at grain boundaries which lowers the strain energy in these regions and thereby retards the formation of high temperature transformation products I-3]. Nevertheless, boron steels tend to retain a reputation for inconsistency and there is still a lack of knowledge about the mechanisms by which boron imparts these remarkable improvements in mechanical properties of steels.In general, the boron treatment of hardenable steels is restricted to compositions containing up to about 0.4~o C because it was shown that as the carbon content increases the effect of boron is reduced and above certain critical levels of carbon, boron has a detrimental effect on hardenability [4]. Accordingly, very few studies have been carried out concerning high-carbon steels.The present investigation was initiated on the basis that a knowledge of the behaviour of boron in high-carbon steels might provide interesting information for understanding the mechanism by which minute percentages of boron improve the hardenability of steels and more generally to clarify various aspects of the boron

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Section: Dissolution Of Boron In Austenite A) Microstructural Charactsupporting

confidence: 93%

Section: Dissolution Of Boron In Austenite A) Microstructural Charactsupporting

confidence: 89%

Microprecipitation in boron-containing high-carbon steels

Lanier¹,

Métauer²,

Moukassi³

1994

Mikrochim Acta

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“…3. As one can see the diffraction peaks of the Fe-based alloys with a large C/B content ratio of 5/2 containing RE metals are very broad and nanoscale primary c-Fe 36 and Fe 48 Cr 15 Mo 14 C 6 B 15 Tm 2 alloys were indexed using the cF116 Fe 23 (C,B) 6 (a ¼ 1059.1 pm) phase lattice [48]. As the Fe 21 Mo 2 C 6 phase [49] has a structure similar to the Fe 23 (B,C) 6 phase, one can suggest possible dissolution of Mo and Cr in the Fe 23 (B,C) 6 phase as well.…”

Section: Resultsmentioning

confidence: 99%

“…As for the truncated pyramidal-shape bulk samples prepared by casting, the entire bulk Fe 48 Table 1. Fig.…”

Section: Resultsmentioning

confidence: 99%

Crystallization behavior of Fe- and Co-based bulk metallic glasses and their glass-forming ability

Louzguine-Luzgin

Базлов

Ketov

et al. 2015

Materials Chemistry and Physics

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“…It is known that boron can substitute for carbon in M 23 C 6 crystal lattice. [24] Delargy et al [25] reported using field ion microscopy analysis; a significant concentration of boron was detected in the M 23 C 6 that precipitated during aging heat treatment of cast IN 939, which is similar in composition to IN 738 alloy. Therefore, based on the aforementioned and considering the relatively high boron concentration of 120 ppm in IN 738 superalloy used in the present study, it is not unreasonable to expect interfacial boron segregation to cause the surrounding of the M 23 X 6 type particle, which is often referred to as M 23 C 6 in IN 738, to be enriched with B atoms or the particle itself to contain a significant amount of boron.…”

Section: Liquation Of Microconstituent Containing M 23 X 6 Particlesmentioning

confidence: 96%

Liquation Microfissuring in the Weld Heat-Affected Zone of an Overaged Precipitation-Hardened Nickel-Base Superalloy

Ojo

Chaturvedi

2007

Metall Mater Trans A

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The effect of preweld overaging heat treatment on the microstructural response in the heataffected zone (HAZ) of a precipitation-hardened nickel-base superalloy INCONEL 738LC subjected to the welding thermal cycle (i.e., rapid) was investigated. The overaging heat treatment resulted in the formation of an interfacial microconstituent containing M 23 X 6 particles and coarsening of primary and secondary c¢ precipitates. The HAZ microstructures around welds in the overaged alloy were simulated using the Gleeble thermomechanical simulation system. Microstructural examination of simulated HAZs and those present in tungsten inert gas (TIG) welded specimens showed the occurrence of extensive grain boundary liquation involving liquation reaction of the interfacial microconstituents containing M 23 X 6 particles and MC-type carbides. In addition, the coarsened c¢ precipitate particles present in the overaged alloy persisted well above their solvus temperature to temperatures where they constitutionally liquated and contributed to considerable liquation of grain boundaries, during continuous rapid heating. Intergranular HAZ microfissuring, with resolidified product formed mostly on one side of the microfissures, was observed in welded specimens. This suggested that the HAZ microfissuring generally occurred by decohesion across one of the solid-liquid interfaces during the grain boundary liquation stage of the weld thermal cycle. Correlation of simulated HAZ microstructures with hot ductility properties of the alloy revealed that the temperature at which the alloy exhibited zero ductility during heating was within the temperature range at which grain boundary liquation was observed. The on-cooling ductility of the alloy was significantly damaged by the on-heating liquation reaction, as reflected by the considerably low ductility recovery temperature (DRT). Important characteristics of the intergranular liquid that could influence HAZ microfissuring of the alloy in overaged condition are also discussed.

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A New Iron Boro-carbide

Cited by 39 publications

References 0 publications

Microprecipitation in boron-containing high-carbon steels

Microprecipitation in boron-containing high-carbon steels

Crystallization behavior of Fe- and Co-based bulk metallic glasses and their glass-forming ability

Liquation Microfissuring in the Weld Heat-Affected Zone of an Overaged Precipitation-Hardened Nickel-Base Superalloy

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