Research on Annealing Process of W-Ni-Fe Heavy Alloys in Rotary Swaged Forging Conditions
W-Ni-Fe heavy alloys with Ni/Fe ratio 7/3 prepared by powder metallurgy,followed by hotrotary swaging forging and annealing treatment were fabricated successively.The results show that the strength of forged W-Ni-Fe alloy increases and the elongation decreases after annealing treatment at a certain temperature.The strength of the alloy can be improved within a certain range of annealing temperature and heating time,and the addition of the heating temperature and time reduce the strength.The annealing process for the greatest strength enhancement are different for the W-Ni-Fe alloys with different tungsten contents.The SEM microstructure photograph of the samples show that the tungsten particles before annealing generate an elongated texture due to rotary swaging forging deformation,but the texture of the tungsten particles does not change significantly after annealing.These phenomena suggest that strain aging occurs in the rotary swaging forging alloy samples after post-swaged annealing,resulting in strength enhancement.The best forging process parameters of W-Ni-Fe alloy with different tungsten content is defined.
tungsten heavy alloysW-Ni-Fe alloysrotary swaging forgingannealing
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