Near-net-shaping hot isostatic pressing of Ti6Al4V Alloys monolithic bladed disks

This study combines the mold process with the hot isostatic pressing method, and the complex monolithic bladed disks are formed by near-net-shaping. Based on this, it gives a scientific analysis of the mold deformation, forming precision and structure property. The results show that the near-net-shaped monolithic bladed disks have a relative density of 99.5%. The SEM results indicate that there is fine and homogeneous strip α+β phase in the parts, with no obvious pores and cracks. Besides, the structure is compact, and the layered phenomenon appears in the microstructure. The tensile strength of parts in the same furnaces can reach 920 MPa, which is better than that of the same size castings, and as same as that of the forgings. The fracture morphology analysis suggests that the sample has a ductile fracture. The HIP method has a high material utilization, which can reduce the process costs, and the molding cycle is longer. This study provides a reference to the near-net-shaping hot isostatic pressing for the bladed disk parts. Copyright © 2015, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.