In recrystallized carbide-strengthened vacuum arc melted tungsten alloy at about 1000°C there occur processes of strain aging, and this causes an abrupt increase of the Ludwik parameters A and n at the first stage of strain-hardening, and also a certain increase of σu.
At 1400°C or more the intense development of thermally activated processes of transverse slip and climbing motion of dislocations prevents the formation of a cellular structure, and this leads to an abrupt loss of strength of the alloy.
The optimal temperature range of deformation of low alloy carbide-strengthened tungsten alloys in the recrystallized state is 1400–1500°C. The strenght properties, and also the suitability of the material for strain-hardening at these temperatures are low while its ductility after deformation is high in consequence of the reduced effective grain size.
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Povarova, K.B., Tolstobrov, Y.O. & Zavarzina, E.K. Change of structure and properties of heterophase tungsten alloys in deformation. Met Sci Heat Treat 29, 448–453 (1987). https://doi.org/10.1007/BF00715884
- Grain Size
- Cellular Structure
- Abrupt Increase