Friday, September 30, 2011 3:00 pm – 4:00 pm
Room 610, M&M Building
Dr. Judson S. Marte
General Electric Global Research Center Niskayuna, NY
Improving the performance and reducing the cost of titanium components is important for aerospace applications, such as gas turbine engines. This presentation will provide an overview of an ongoing collaborative program between ATI Allvac and GE evaluating the production, characterization, and application of ultrafine-grained titanium. Multi-axis forging (MAF) has been used to produce bulk samples with submicron alpha grain size. Extensive characterization of the microstructure shows that, after MAF, the beta phase tends to pin alpha, enhancing thermal stability. Deformation properties have been evaluated and used to make finite element models of near-net shape forging processes. Laboratory-scale near-net shape forgings have been produced to demonstrate feasibility and provide material for microstructural and mechanical evaluation. Tensile and fatigue performance of the sub-scale forgings will be presented, as will a brief discussion of the challenges associated with developing a full-scale forging process.
Jud is currently the Manager of the Metals Processing and Testing Laboratory at GE Global Research in Niskayuna, NY. He is also a project leader and metallurgist who specializes in the thermomechanical processing of structural metals, low temperature superconductors, and magnetic materials. Prior to joining GE in 1999, he earned his PhD in Materials Science and Engineering at Virginia Tech studying the synthesis and processing of titanium- and titanium aluminide- matrix composites.