Mechanical and Fatigue Properties of Tungsten Heavy Alloy Prepared by RF-Plasma

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F21%3A00380988" target="_blank" >RIV/68407700:21340/21:00380988 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.31399/asm.cp.itsc2021p0115" target="_blank" >https://doi.org/10.31399/asm.cp.itsc2021p0115</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.31399/asm.cp.itsc2021p0115" target="_blank" >10.31399/asm.cp.itsc2021p0115</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Mechanical and Fatigue Properties of Tungsten Heavy Alloy Prepared by RF-Plasma

Popis výsledku v původním jazyce

Tungsten heavy alloy (WHA) of W-Ni composition was deposited from a blend of standard thermal spray powders using radio frequency inductively coupled plasma torch (RF-ICP) in a protective atmosphere. The deposit (RF WHA) contained a fully developed WHA structure, i.e., spherical W particles embedded in a Ni-rich matrix. The bending tensile strength Rm, bending yield strength Rp,0.2, and elastic modulus of the deposit were compared with two W-Ni-Co references fabricated by powder metallurgy (PM WHA) via sintered and quenched (PMSQ), and forged and annealed (PM-FA). While the RF deposit properties are comparable with the PM-SQ reference, the PMFA exhibited higher mechanical properties. The deposit showed very limited ductility A < 3%. The fatigue crack growth rate in the deposit measured in bending (R < -1) was comparable to the PM-SQ reference material in the near-threshold region whereas the forged PM-FA had significantly better fatigue performance. In the near-threshold fatigue regime, the crack growth took place in the Ni-rich matrix. In the Paris regime, the similar fracture mode was observed, with the exception of PM-SQ, where the tungsten particles fracture contributed significantly. The static failure was exclusively trans-particle in RF WHA, while both PM WHAs failed by a mix of ductile matrix failure and trans-particle cleavage fracture. The fracture toughness of the deposit was significantly lower than the references. These early results indicate that RF-plasma spray is a suitable and efficient manufacturing method for production of WHA materials, however with limited mechanical properties in some aspects.

Název v anglickém jazyce

Mechanical and Fatigue Properties of Tungsten Heavy Alloy Prepared by RF-Plasma

Popis výsledku anglicky

Tungsten heavy alloy (WHA) of W-Ni composition was deposited from a blend of standard thermal spray powders using radio frequency inductively coupled plasma torch (RF-ICP) in a protective atmosphere. The deposit (RF WHA) contained a fully developed WHA structure, i.e., spherical W particles embedded in a Ni-rich matrix. The bending tensile strength Rm, bending yield strength Rp,0.2, and elastic modulus of the deposit were compared with two W-Ni-Co references fabricated by powder metallurgy (PM WHA) via sintered and quenched (PMSQ), and forged and annealed (PM-FA). While the RF deposit properties are comparable with the PM-SQ reference, the PMFA exhibited higher mechanical properties. The deposit showed very limited ductility A < 3%. The fatigue crack growth rate in the deposit measured in bending (R < -1) was comparable to the PM-SQ reference material in the near-threshold region whereas the forged PM-FA had significantly better fatigue performance. In the near-threshold fatigue regime, the crack growth took place in the Ni-rich matrix. In the Paris regime, the similar fracture mode was observed, with the exception of PM-SQ, where the tungsten particles fracture contributed significantly. The static failure was exclusively trans-particle in RF WHA, while both PM WHAs failed by a mix of ductile matrix failure and trans-particle cleavage fracture. The fracture toughness of the deposit was significantly lower than the references. These early results indicate that RF-plasma spray is a suitable and efficient manufacturing method for production of WHA materials, however with limited mechanical properties in some aspects.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/GA19-14339S" target="_blank" >GA19-14339S: Vysokoteplotní příprava pokročilých žáruvzdorných materiálů indukčně vázaným plazmatem v kontrolované atmosféře</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Thermal Spray 2021: Proceedings from the International Thermal Spray Conference

ISBN

978-1-7138-3130-3

ISSN

—

e-ISSN

—

Počet stran výsledku

7

Strana od-do

115-121

Název nakladatele

ASM International

Místo vydání

Materials Park, OH

Místo konání akce

virtual

Datum konání akce

24. 5. 2021

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—