Journal
FUSION ENGINEERING AND DESIGN
Volume 126, Issue -, Pages 51-58Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.fusengdes.2017.11.010
Keywords
W-TiC alloy; Mechanical alloying; Thermal properties; HIPping; Bending strength
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Funding
- Ministry of Science and Higher Education (MNiSW), Poland [S/WM/1/2015]
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In this work an influence of a fabrication route on the microstructure, thermal and mechanical properties of the W-1%TiC was studied. The W-1%TiC powder was mechanically alloyed using the stainless steel milling media. Two-step HIPping of the powder at 1300 degrees C (1573 K) and then at 1750 degrees C (2023 K) was performed. After second step HIPping, in spite of 13.5% of porosity, bending stress and strain values were 300 MPa and 2%, respectively. On the contrary, the grain growth (from 0.7 up to 22.0 mu m) and coarsening mechanisms of the TiC nanoparticles were observed. Up to 1200 degrees C (1473 K), thermal expansion parameters of two-step HIPped W-1%TiC alloy exhibited thermally unchanged values, comparable with a pure W rod, however, the thermal conductivity of the W-TiC alloy at RT was 26.5 W/m K, and at 1200 degrees C (1473 K) this parameter increased up to 44.8 W/m Km K.
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