MECHANICAL PROPERTIES OF FORGED TUNGSTEN HEAVY ALLOYS

Authors

  • Ondřej Kovářík Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Materials, Trojanova 13, Praha 2, Czech Republic
  • Jaroslav Čech Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Materials, Trojanova 13, Praha 2, Czech Republic
  • Jiří Čapek Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Materials, Trojanova 13, Praha 2, Czech Republic
  • Michal Hajíček UJP Praha a.s., Nad Kamínkou 1345, Praha-Zbraslav, Czech Republic
  • Jakub Klečka Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Materials, Trojanova 13, Praha 2, Czech Republic Czech Academy of Sciences, Institute of Plasma Physics, Za Slovankou 1782/3, Praha-Liben, Czech Republic
  • Jan Siegl Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Materials, Trojanova 13, Praha 2, Czech Republic

DOI:

https://doi.org/10.14311/APP.2020.27.0149

Keywords:

Instrumented indentation, residual strain, stress-strain, tungsten heavy alloy, W6Ni3Co

Abstract

Tungsten heavy alloys are composite materials containing spherical tungsten particles embedded in binder matrix. Their excellent mechanical properties can be further improved by rotary forging. This paper aims to gain deeper understanding of the forging process by investigating the local elastic modulus, hardness, and residual stress of individual phases in W6Ni3Co pseudo-alloy. The resulting global properties of the composite material such as stress-strain behavior, fracture toughness and fatigue crack growth rate behavior are also studied. The results show that sintered and quenched material consists of highly textured matrix containing nearly perfect single crystal spheres of pure W. The rotary forging leads to significant lattice deformations destroying the texture and significantly increasing the hardness of both WNiCo matrix and W particles and making residual stresses in W particles anisotropic with increased compression along the longitudinal axis of the forged part.

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Published

2020-06-11

Issue

Vol. 27 (2020): Proceedings of the 14th International Conference on Local Mechanical Properties - LMP 2019

Section

Articles

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