Abstract
The effect of swaging on the microstructure and mechanical properties of 93W-4.9Ni-2.1Fe alloy was investigated. The alloy was prepared by liquid-phase sintering under hydrogen atmosphere followed by vacuum heat treatment and swaging at 600 C with different area reductions (ranging from 15.0% to 84.8%). The as-swaged alloy with area reduction 84.8% exhibits the highest ultimate tensile strength (about 1490 MPa) and the lowest elongation (about 2.5%), which has been attributed to higher fraction of tungsten cleavage. For the as-sintered alloys, the fracture modes are a combination of the ductile rupture of W-Ni-Fe-Co matrix, transgranular cleavage of the tungsten particles, W-W interfacial segregation and W-M interfacial debonding, whereas transgranular cleavage of the tungsten particles is the main characteristic in the as-swaged alloy. Transmission electron microscopy images indicate that tungsten grains and W-Ni-Fe-Co matrix phase are composed of high-density dislocations. Based on the results, when running the swaging of 93W-4.9(Ni, Co)-2.1Fe alloy at 600 C, the strengthening mechanism can be mainly due to the working-hardening.
| Original language | English |
|---|---|
| Pages (from-to) | 103-108 |
| Number of pages | 6 |
| Journal | International Journal of Refractory Metals and Hard Materials |
| Volume | 44 |
| DOIs | |
| State | Published - May 2014 |
| Externally published | Yes |
Keywords
- Mechanical properties
- Microstructure
- Sintering
- Swaging
- Tungsten heavy alloys
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