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Role of the microst...
Role of the microstructure and the residual strains on the mechanical properties of cast tungsten carbide produced by different methods
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- Ciurans Oset, Marina, 1993- (författare)
- Luleå tekniska universitet,Materialvetenskap,Höganäs Sweden AB - Metasphere, Upplagsvägen 28, SE-972 54, Luleå, Sweden
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- Flasar, Petr (författare)
- Dormer Pramet s.r.o, Unicovska 2, 787 53, Sumperk, Czech Republic
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- Jenczyk, Piotr (författare)
- Division of Surface Layers, Department of Mechanics of Materials, Institute of Fundamental Technological Research, Polish Academy of Sciences, 02-106, Warsaw, Poland
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- Jarząbek, Dariusz (författare)
- Division of Surface Layers, Department of Mechanics of Materials, Institute of Fundamental Technological Research, Polish Academy of Sciences, 02-106, Warsaw, Poland
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- Mouzon, Johanne (författare)
- Luleå tekniska universitet,Materialvetenskap,Höganäs Sweden AB - Metasphere, Upplagsvägen 28, SE-972 54, Luleå, Sweden
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- Akhtar, Farid (författare)
- Luleå tekniska universitet,Materialvetenskap
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(creator_code:org_t)
- Elsevier, 2024
- 2024
- Engelska.
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Ingår i: Journal of Materials Research and Technology. - : Elsevier. - 2238-7854 .- 2214-0697. ; 30, s. 3640-3649
- Relaterad länk:
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https://doi.org/10.1...
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https://ltu.diva-por... (primary) (Raw object)
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Cast tungsten carbide (CTC) is a biphasic, pearlitic-like structure composed of WC lamellae in a matrix of W2C. Besides excellent flowability, spherical CTC powders exhibit superior hardness and wear resistance. Nevertheless, the available literature generally fails to explain the physical mechanisms behind such a phenomenon. In the present work, the microstructure and the mechanical properties of the novel centrifugally-atomized spherical CTC have been extensively investigated. This material exhibited an extremely fine microstructure, with WC lamellae of 27-29 nm in thickness and bulk lattice strains of 1.0-1.4 %, resulting in a microindentation hardness of 31.4 ± 1.6 GPa. The results of this study clearly show that centrifugally-atomized CTC is mechanically superior to both spheroidized CTC and conventional cast-and-crushed CTC. In addition, the effect of a series of heat treatments on the bulk fracture toughness and the fatigue life of entire CTC particles was also investigated. The reduction of residual stresses in the bulk of particles upon annealing dramatically increased the indentation fracture toughness, whereas the bulk microindentation hardness remained essentially unaffected. Regarding the fatigue life of entire particles under uniaxial cyclic compressive loading, local phase transformation phenomena at the surface of the particles upon heat treatment were concluded to play the most critical role. Indeed, the cumulative fatigue damage was minimized in surface-carburized CTC powders, where compressive stresses were induced at the outermost surface.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Annan materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Other Materials Engineering (hsv//eng)
Nyckelord
- Cast Tungsten Carbide
- Microindentation Hardness
- X-ray Diffraction
- Lattice Microstrains
- Dislocation Density
- Compression
- Engineering Materials
- Materialteknik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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