Article

Journal of Materials Engineering and Performance

, Volume 20, Issue 2, pp 203-212

First online:

Tensile Properties and Microstructures of Laser-Formed Ti-6Al-4V

  • J. AlcistoAffiliated withMechanical Engineering Department, Loyola Marymount University
  • , A. EnriquezAffiliated withMechanical Engineering Department, Loyola Marymount University
  • , H. GarciaAffiliated withMechanical Engineering Department, Loyola Marymount University
  • , S. HinksonAffiliated withMechanical Engineering Department, Loyola Marymount University
  • , T. SteelmanAffiliated withNorthrop Grumman, Space Technology
  • , E. SilvermanAffiliated withNorthrop Grumman, Space Technology
  • , P. ValdovinoAffiliated withNorthrop Grumman, Space Technology
  • , H. GigerenzerAffiliated withTriton Systems Incorporated
  • , J. FoyosAffiliated withMechanical Engineering Department, Loyola Marymount University
    • , J. OgrenAffiliated withMechanical Engineering Department, Loyola Marymount University
    • , J. DoreyAffiliated withMechanical Engineering Department, Loyola Marymount University
    • , K. KargAffiliated withTriton Systems Incorporated
    • , T. McDonaldAffiliated withTriton Systems Incorporated
    • , O. S. Es-SaidAffiliated withMechanical Engineering Department, Loyola Marymount University Email author 

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Abstract

The room temperature tensile properties of Ti-6Al-4V alloy prepared under two different processing routes were evaluated and compared. One group of samples was prepared by conventional casting-forging-rolling into flat plates. The other group was prepared by using Triton’s Laser Free-Form Fabrication (LF3)™ processes, i.e., a laser was used to melt pre-alloyed powders of the required metallic composition as they were dropped onto a moveable substrate programmed to move in such a manner as to form a solid alloy plate. Five populations of Ti-6Al-4V were evaluated: a standard wrought form, an as-deposited form, a machined as-deposited form, a heat-treated as-deposited form, and a machined as-deposited and heat-treated form. The poorest mechanical properties occurred with the rough surfaces, likely due to existing microcracks and stress concentrations. The LF3™ as-deposited material had mechanical properties comparable to, if not higher than, the mechanical properties of the wrought material. Further evaluations of the laser-formed material for complex spacecraft piece parts were warranted, specifically in regards to improving the surface finish of the materials.

Keywords

laser free-form fabrication (LF3) mechanical properties microstructure Ti-6Al-4V