Parameter Matching of Near-beta Forging plus Solution and Aging Treatment for Near- alpha Titanium Alloy with Tri-modal Microstructure

Based on the orthogonal experiment results, the significance of process parameters of near-beta forging+solution and aging was analyzed. The effect of process parameters on the microstructure of TA15 alloy was discussed, and the proper process parameters were obtained to achieve the tri-modal microstructure with excellent properties. Results show that the deformation temperature, solution temperature, and solution duration are the most important process parameters, which affects mostly the volume fraction and diameter of the equiaxed a(p) phase, the volume fraction of the lamellar a(s) phase, and the thickness of the lamellar a(s) phase, respectively. The optimal processing parameters are 970 degrees C/0.1 s(-)1/deformation degree of 60%/water quenching+930 degrees C/1.5 h/air cooling+550 degrees C/5 h/air cooling.