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Open AccessArticle

Effects of Sintering Conditions on Structures and Properties of Sintered Tungsten Heavy Alloy

1
Institute of Physics of Materials, CAS, 61662 Brno, Czech Republic
2
Faculty of Materials Science and Technology, VŠB-Technical University of Ostrava, 70833 Ostrava 8, Czech Republic
*
Author to whom correspondence should be addressed.
Materials 2020, 13(10), 2338; https://doi.org/10.3390/ma13102338
Received: 27 April 2020 / Revised: 17 May 2020 / Accepted: 18 May 2020 / Published: 19 May 2020
Probably the most advantageous fabrication technology of tungsten heavy alloys enabling the achievement of required performance combines methods of powder metallurgy and processing by intensive plastic deformation. Since the selected processing conditions applied for each individual processing step affect the final structures and properties of the alloys, their optimization is of the utmost importance. This study deals with thorough investigations of the effects of sintering temperature, sintering time, and subsequent quenching in water on the structures and mechanical properties of a 93W6Ni1Co tungsten heavy alloy. The results showed that sintering at temperatures of or above 1525 °C leads to formation of structures featuring W agglomerates surrounded by the NiCo matrix. The sintering time has non-negligible effects on the microhardness of the sintered samples as it affects the diffusion and structure softening phenomena. Implementation of quenching to the processing technology results in excellent plasticity of the green sintered and quenched pieces of almost 20%, while maintaining the strength of more than 1000 MPa. View Full-Text
Keywords: tungsten heavy alloy; powder metallurgy; sintering; quenching; microstructure tungsten heavy alloy; powder metallurgy; sintering; quenching; microstructure
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MDPI and ACS Style

Kunčická, L.; Kocich, R.; Klečková, Z. Effects of Sintering Conditions on Structures and Properties of Sintered Tungsten Heavy Alloy. Materials 2020, 13, 2338.

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