Effect of MC Type Carbides on Age Hardness and Thermal Expansion of Fe–36 wt%Ni–0.2 wt%C Alloy

Nakama, Kazuo; Sugita, Kazuki; Shirai, Yoshihito

doi:10.1007/s13632-013-0101-9

Cited by 11 publications

(4 citation statements)

References 6 publications

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“…as carbides' alloys [5][6][7] . Tantalum carbides are also used to strengthen copper-based alloys 8 , alloyed steels 9,10 , titanium-based 11 and molybdenum-based 12 alloys. Besides coating techniques and sintering route, TaC carbides can precipitate during solidification, and are in equiaxed alloys and even in directionally solidified alloys 13 .…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and experimental study of 30 wt-%Cr-containing {Co, Fe or Ni}-based alloys with very high contents in Ta and C

Berthod

Corona

2016

Canadian Metallurgical Quarterly

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TaC carbides are among the most efficient particles for reinforcing cast refractory alloys and superalloys against mechanical stresses at temperature as high as 1000°C and over. The most common TaC-strengthened superalloys contain less than 0.5 wt.%C and 5wt.%Ta. Enriching alloys in C and Ta may lead to higher fractions in TaC and therefore possibly to higher mechanical properties for service in hot conditions. The present work explores the microstructures achievable in a cobalt alloy, a nickel one and an iron one, by the introduction of 1 wt.%C and 15wt.%Ta, first using thermodynamic calculations and second by real elaboration. High fractions in TaC were effectively obtained, script-like eutectic ones, but also blocky preeutectic ones less efficient for reinforcement. These blocky TaC, the formation of which was explained by thermodynamic calculations, tend to aggregate together in some locations, with an overconsumption of Ta. However, some disagreements were noticed between predictions with thermodynamic calculations and as-cast microstructures.

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Section: Introductionmentioning

confidence: 99%

Thermodynamic and experimental study of 30 wt-%Cr-containing {Co, Fe or Ni}-based alloys with very high contents in Ta and C

Berthod

Corona

2016

Canadian Metallurgical Quarterly

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“…It has been reported that the tensile strength of Invar can be increased up to 650 MPa by precipitation of Cr carbides [ 4 ]. Some studies have shown that the strengthening of Invar alloy through carbide-forming elements, Ti, V, Zr, Nb, and Ta, achieved 1100 MPa tensile strength after heat treatment [ 22 , 23 ]. The strengthening of Invar alloys can be improved by precipitation of some intermetallic compounds, such as Ni 3 Ti, Ni 3 Al, Ni 4 Mo, and by Al or Mo alloying [ 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Invar/WC Composite Compacts Obtained by Spark Plasma Sintering from Mechanically Alloyed Powders

et al. 2022

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The composite materials are used on an increasingly large scale in top fields, such as the automotive, aerospace, and nuclear industries, due to the combination of the specific properties of the composite components. Invar/WC nanocrystalline composite compacts were successfully obtained by spark plasma sintering from mechanical milled composite powder. The influence of the amount of tungsten carbide (WC) on sintering, coefficient of thermal expansion (CTE), and hardness has been investigated. The relative density and hardness of Invar/WC composite compacts increases with increasing the WC content up to 10 vol.%. At higher amount of WC (15% vol.), the relative density and hardness of the Invar/WC composite compacts decreases. The temperature up to which CTE remains at a low value (0.6–1) × 10−6 °C−1 is influenced by the WC content and decreases with the WC amount of increase.

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“…The strengthening of Invar alloy can be achieved primarily through three methods: grain refinement [5], plastic deformation (and severe plastic deformation, SPD) [6], and precipitation hardening [4,[7][8][9]. Vingradov et al [8] reported that the tensile strength of Fe-36Ni Invar alloy can be increased to 912 MPa by refining the grain size to 180 nm using equal channel angular pressing (ECAP).…”

Section: Introductionmentioning

confidence: 99%

“…The strengthening of Invar alloy through the precipitation of MC-type carbides, such as TiC, VC, and Mo 2 C, or intermetallics, such as γ'-type Ni 3 Ti and Ni 3 Al, was reported to be highly effective. Nakama et al reported a Fe-Ni-V-C Invar alloy reaches a tensile strength of 1000 MPa after a combination of solutionization, aging, which produces VC precipitates, and cold working [7,9]; the same author reported the strengthening of Invar alloy containing Ti, V, and C through TiC and VC precipitation, and achieved 1100 MPa tensile strength at peak aging condition [6]. Yahagi et al reported a Fe-Ni-Co-Ti Invar alloy strengthened by the precipitation of γ'-type Ni 3 Ti intermetallics exhibits a tensile strength of 1313 MPa after cold working [10].…”

Section: Introductionmentioning

confidence: 99%

Fe–Ni Invar alloy reinforced by WC nanoparticles with high strength and low thermal expansion

et al. 2019

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Invar is a solid solution alloy that offers high-dimensional stability. It is challenging for traditional methods to strengthen Invar alloys without a significant increase in the coefficient of thermal expansion (CTE). In this work, WC nanoparticlereinforced Invar nanocomposite was manufactured. The microstructures, mechanical properties, and thermal expansion behavior were investigated. It was found that the Invar alloy was effectively strengthened by WC nanoparticle reinforcement without significant elevation of its CTE. The Invar-WC nanocomposite exhibits an enhanced yield and tensile strength of 440 and 795 MPa, an increase of 60% and 77% from commercial Invar alloy, and a moderate ductility of 22.7% in annealed state. In cold-rolled state, The Invar-WC nanocomposite exhibits a high tensile strength of 1050 MPa, an increase of 46% from commercial Invar alloy, while retaining 4.5% ductility. A record low CTE value of 2.61 × 10 −6 /°C and an enhanced Young's modulus of 185 GPa, up from 140 GPa, were also achieved. It was found that WC leads to a lower CTE at higher temperature compared to unreinforced Invar.

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Effect of MC Type Carbides on Age Hardness and Thermal Expansion of Fe–36 wt%Ni–0.2 wt%C Alloy

Cited by 11 publications

References 6 publications

Thermodynamic and experimental study of 30 wt-%Cr-containing {Co, Fe or Ni}-based alloys with very high contents in Ta and C

Thermodynamic and experimental study of 30 wt-%Cr-containing {Co, Fe or Ni}-based alloys with very high contents in Ta and C

Invar/WC Composite Compacts Obtained by Spark Plasma Sintering from Mechanically Alloyed Powders

Fe–Ni Invar alloy reinforced by WC nanoparticles with high strength and low thermal expansion

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