Carbon – Chromium – Iron

Bondar, A. А.; Ivanchenko, Volodymyr; Kozlov, Artem; Tedenac, Jean‐Claude

doi:10.1007/978-3-540-74196-1_3

Cited by 11 publications

(1 citation statement)

References 132 publications

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“…The solidification to room temperature during casting would lead to the formation of a carbide network, which is in agreement with the observations in as-cast HP-MA. Although M 7 C 3 (30 at%) contains more carbon than M C 6 (21 at%), M C 3 can form at low carbon level and similarly M C 6 can form at very high carbon level when chromium content is high enough [37][38][39]. Gregolin and Alcantara [39] developed a solidification model for Fe-14.7wt%Cr-1.0wt%Nb-2.1wt%C alloys, where MC is the first phase to form when cooled from the liquid (Nb and Ti are strong carbide formers [41]), and the presence of MC is followed by the reaction L → γ + !…”

Section: Discussionmentioning

confidence: 99%

Primary carbide transformation in a high performance micro-alloy at 1000 °C

Wang

Flahaut

Zhu

et al. 2019

Journal of Alloys and Compounds

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The transformation from M 7 C 3 → M 23 C 6 in a high performance micro alloy (HP-MA) was studied using different techniques. Following the cooling during the centrifugal casting, the as-cast HP-MA alloy consists of an austenitic matrix with the primary carbide network consisting of a combination of M 7 C 3 (M being mainly chromium) and MC (M being mainly niobium). During the heat treatment at 1000 o C, the primary chromium carbides transform from M 7 C 3 to M 23 C 6. The incompletely transformed primary carbide consists of an outer shell of M 23 C 6 carbide (coherent with the austenitic matrix) and a core of M 7 C 3 type carbide. The experimentally determined M23C6 shell thickness agrees reasonably well with the estimated diffusion distance of carbon in M 23 C 6 based on Zener's relation implying that the M 7 C 3 → M 23 C 6 transformation is mainly controlled by the diffusion of the carbon from M 7 C 3 to the matrix through the M 23 C 6 shell. This mechanism is discussed vis-à-vis the literature reported mechanism on the transformation.

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