Thermodynamic modelling of a six component (C-Co-Cr-Ni-Ta-W) system for the simulation of Cobalt based alloys

Cacciamani, G.; Roncallo, Giacomo; Wang, Yao; Vacchieri, E.; Costa, A.

doi:10.1016/j.jallcom.2017.09.327

Cited by 22 publications

(3 citation statements)

References 70 publications

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“…Carbides are desirable precipitates that improve tensile and creep strength and they have better thermal stability than γ′ precipitates, [ 36 , 37 , 38 , 39 ]. In cast Mar-M 509, Cr contributes to the formation of M 23 C 6 carbides at room and intermediate temperatures and M 7 C 3 carbides at higher temperatures during solidification [ 29 , 40 ]. Mixed MC carbides enriched in Ta, W, Ti, and Zr are stable across all temperatures and form in the mushy zone during solidification [ 40 , 41 ].…”

Section: Introductionmentioning

confidence: 99%

“…In cast Mar-M 509, Cr contributes to the formation of M 23 C 6 carbides at room and intermediate temperatures and M 7 C 3 carbides at higher temperatures during solidification [ 29 , 40 ]. Mixed MC carbides enriched in Ta, W, Ti, and Zr are stable across all temperatures and form in the mushy zone during solidification [ 40 , 41 ]. However, the exact carbide phases present from nonequilibrium solidification in LPBF Mar-M 509 are not well characterized.…”

Section: Introductionmentioning

confidence: 99%

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In Situ Reactive Formation of Mixed Oxides in Additively Manufactured Cobalt Alloy

Lopez,

Cerne,

et al. 2023

Materials

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Oxide-dispersion-strengthened (ODS) alloys have long been considered for high temperature turbine, spacecraft, and nuclear reactor components due to their high temperature strength and radiation resistance. Conventional synthesis approaches of ODS alloys involve ball milling of powders and consolidation. In this work, a process-synergistic approach is used to introduce oxide particles during laser powder bed fusion (LPBF). Chromium (III) oxide (Cr2O3) powders are blended with a cobalt-based alloy, Mar-M 509, and exposed to laser irradiation, resulting in reduction–oxidation reactions involving metal (Ta, Ti, Zr) ions from the metal matrix to form mixed oxides of increased thermodynamic stability. A microstructure analysis indicates the formation of nanoscale spherical mixed oxide particles as well as large agglomerates with internal cracks. Chemical analyses confirm the presence of Ta, Ti, and Zr in agglomerated oxides, but primarily Zr in the nanoscale oxides. Mechanical testing reveals that agglomerate particle cracking is detrimental to tensile ductility compared to the base alloy, suggesting the need for improved processing methods to break up oxide particle clusters and promote their uniform dispersion during laser exposure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In Situ Reactive Formation of Mixed Oxides in Additively Manufactured Cobalt Alloy

Lopez,

Cerne,

et al. 2023

Materials

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“…The movable latch is made of stainless steel substrate and Co-based alloy surfacing layer to improve the service life of CRDM [6]. Besides, C and Cr elements are added to the surfacing layer for enhancement of hardness and corrosion, respectively [7,8].…”

Section: Introductionmentioning

confidence: 99%

Wear Characteristics of the Nuclear Control Rod Drive Mechanism (CRDM) Movable Latch Serviced in High Temperature Water

et al. 2022

Chin. J. Mech. Eng.

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The current research of nuclear control rod drive mechanism (CRDM) movable latch only makes a simple measurement of wear mass. The wear volume and difference in various claw surfaces are ignored and the degradation mechanism of each claw surface is not clear. In this paper, a detailed degradation analysis was carried out on each claw surface of movable latch combined with wear result and worn morphology. Results indicate that the boundary of carbide is preferred for corrosion because carbide presents a nobler Volta potential compared to the metal matrix or boundary region. Due to the oscillation of drive shaft between the claw surfaces of movable latch, the dominant wear mechanism on the upper surface of claw (USC) and lower surface of claw (LSC) is plastic deformation caused by impact wear. Mechanical impact wear will cause the fragmentation of carbides because of the high hardness and low ductility of carbides. Corrosion promotes the broken carbides to fall off from the metal matrix. The generated fine carbides (abrasive particles) cause extra abrasive wear on USC when the movable brings the drive shaft upward or downward. As a result, USC has a higher wear volume than LSC. This research proposes a method to evaluate the wear on the whole movable latches using a 3D full-size scanner.

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Characterization of the as-cast microstructure and selected properties of the X-40 Co-based superalloy produced via lost-wax casting

Rakoczy

Grudzień-Rakoczy

Cygan

et al. 2022

Archiv.Civ.Mech.Eng

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Thermodynamic modelling of a six component (C-Co-Cr-Ni-Ta-W) system for the simulation of Cobalt based alloys

Cited by 22 publications

References 70 publications

In Situ Reactive Formation of Mixed Oxides in Additively Manufactured Cobalt Alloy

In Situ Reactive Formation of Mixed Oxides in Additively Manufactured Cobalt Alloy

Wear Characteristics of the Nuclear Control Rod Drive Mechanism (CRDM) Movable Latch Serviced in High Temperature Water

Characterization of the as-cast microstructure and selected properties of the X-40 Co-based superalloy produced via lost-wax casting

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