Affiliation:
1. Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Krakow, Poland
Abstract
As AM Ti alloys generally contain porosity, for demanding applications it
must be eliminated. HIP was reported, but it is expensive; accordingly
forging by upsetting of EBM Ti6Al4V at 900?C was investigated. Strain rates
of 0.01-1 s-1 were employed. In contrast to the as-printed material,
porosity was not detected. From the plastometric tests the stress-true
strain relationships were obtained and peak stresses were determined. Using
the Simufact simulation program, details of the distribution of equivalent
strains and temperatures were obtained. Comparison with wrought cast and
printed materials is reported. The eventual microstructure consisted of
alpha lamellae ranging in width from 1.81 to 2.34 ?m, depending on strain
rate and deformation, and beta formed in the interlamellar space during
cooling in air. The hardness of the fully processed material was in the
range of 293-304 HV1, independently of strain rate. This is to be compared
with EBM Ti64, 316-360 HV0.3, and similarly processed cast wrought material,
350-365 HV0.3.
Publisher
National Library of Serbia
Subject
Materials Chemistry,Metals and Alloys,Condensed Matter Physics,Ceramics and Composites