Effect of Rotary Swaging on the Microstructure of Tungsten Heavy Alloy

摘要

This study investigates the effect of swaging on the tungsten and matrix phase in liquid phasesintered 93W-4.9Ni-2.1Fe alloy. The investigation has been carried out both on as sintered as well ascold swaged samples. The alloy was liquid phase sintered and subsequently swaged to 65% reductionin area in six steps without intermediate annealing. Stereological measurements on the as-sinteredand swaged samples show a marked increase in the grain size in longitudinal direction and acorresponding reduction in radial direction. The effect of swaging on the grain size and contiguity wasalso evaluated. Detail microstructure analysis of the as-sintered and swaged samples was carried outusing transmission electron microscope. It has been found that the dislocation density in the tungstengrain and the matrix phase increases with increasing the deformation level. The sub-grain formation oftungsten grain at higher deformation level was correlated with the hardness studies of the system.