Studies on the influences of forging processes on the microstructures and properties of TA15 rods
TA15 rods with the diameter of 100 mm and 200 mm were produced by free forging and ra-dial forging respectively.In this study,the effects on the microstructures and mechanical properties of TA 15 rods were investigated.It is shown that there are dramatic differences in the microstructures at different positions of two rods.Deformation occurs in the center of the radial forged rods with a consid-erable amount of primary α phase in the microstructure,ascertained by the irregular and deformed ap-pearance of the primary and secondary α phases.The content of α phase in two rods is lowered from the center to the edge,while the amount of β transformation phases increase.The phase morphology change in the free forged rod is negligible after annealing.However,a great quantity of blocky α phase and tiny recrystallized grains appear in the microstructure of radial forged rod after annealing.The tensile strength,area reduction and impact energy of the rod are increased by radial forging.The long and thin lamellar structures provide more interfaces of α/β phases,promoting fast diffusion at high temperature and leading to the results that the high-temperature properties of free forged rod are worse compared to that of the radial forged rod.
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