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

  • J. Alcisto
  • A. Enriquez
  • H. Garcia
  • S. Hinkson
  • T. Steelman
  • E. Silverman
  • P. Valdovino
  • H. Gigerenzer
  • J. Foyos
  • J. Ogren
  • J. Dorey
  • K. Karg
  • T. McDonald
  • O. S. Es-Said
Article

DOI: 10.1007/s11665-010-9670-9

Cite this article as:
Alcisto, J., Enriquez, A., Garcia, H. et al. J. of Materi Eng and Perform (2011) 20: 203. doi:10.1007/s11665-010-9670-9
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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 

Copyright information

© ASM International 2010

Authors and Affiliations

  • J. Alcisto
    • 1
  • A. Enriquez
    • 1
  • H. Garcia
    • 1
  • S. Hinkson
    • 1
  • T. Steelman
    • 2
  • E. Silverman
    • 2
  • P. Valdovino
    • 2
  • H. Gigerenzer
    • 3
  • J. Foyos
    • 1
  • J. Ogren
    • 1
  • J. Dorey
    • 1
  • K. Karg
    • 3
  • T. McDonald
    • 3
  • O. S. Es-Said
    • 1
  1. 1.Mechanical Engineering DepartmentLoyola Marymount UniversityLos AngelesUSA
  2. 2.Northrop Grumman, Space TechnologyRedondo BeachUSA
  3. 3.Triton Systems IncorporatedChelmsfordUSA

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