Equiaxed Cast Polycristalline Refractory Alloys Designed to Be Strengthened by Mono-carbides: Dependence of the As-Cast Microstructure on the Base Element and on the MC-former Element

Abstract : This work consists in a general exploration of the microstructures which can be obtained after solidification for a wide series of alloys for which the base element and the MC-former element both vary. For given contents in Cr, M and C contents, the compositions of nineteen alloys were considered. They are based on Ni, Co, Fe or Nb while the wished carbides are TiC, TaC, NbC, HfC or ZrC. After solidification and cooling, metallographic samples were prepared and characterized by electron microscopy to discover the obtained microstructures. Results show first that MC carbides are generally successfully obtained at the expense of other possible carbides (e.g. all Co-based alloys) but there also are several exceptions (e.g. some Ni-based alloys). Second, the obtained MC-carbides are on a eutectic origin and script-liked shaped but here too some exceptions may be noted (e.g. HfC in Nb-based alloys). Globally the results of this work demonstrate that the principle of dendritic matrix associated to MC carbides with a script-like morphology is not systematically obtained: the nature of (base element, MC-former element) governs the as-cast microstructures of the alloys for these particular Cr and C compositions and may lead to other carbides and even other microstructures types.
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https://hal.univ-lorraine.fr/hal-02087470
Contributor : Patrice Berthod <>
Submitted on : Tuesday, April 2, 2019 - 10:09:32 AM
Last modification on : Wednesday, September 4, 2019 - 2:06:04 PM
Long-term archiving on: Wednesday, July 3, 2019 - 2:00:32 PM

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Patrice Berthod. Equiaxed Cast Polycristalline Refractory Alloys Designed to Be Strengthened by Mono-carbides: Dependence of the As-Cast Microstructure on the Base Element and on the MC-former Element. 2019. ⟨hal-02087470⟩

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