Title

Investigation of Forged-Like Microstructure Produced by a Hybrid Manufacturing Process

Abstract

Laser Metal Deposition (LMD) is an additive manufacturing technique for manufacturing complex near net shaped components. The grain size of the typical deposition microstructure in case of Ti-6Al-4V can range between 100µm-600µm, which is much larger than that of forged-like microstructures. Friction Stir Processing (FSP) has been investigated as a method for surface modification to form refined microstructure at the surface of the Ti-6Al-4V components manufactured from the LMD method. Integration of FSP and LMD can greatly improve the product properties. Friction stir processing of the laser deposited Ti-6Al-4V deposits was performed and optimum processing parameters were obtained using this hybrid process. The microstructure of the nugget regions obtained in the substrate weld, stir over deposit and deposit over stir experiments is presented. A much decreasing grain size was observed in the dilution zone inside the nugget from the stir surface to the bottom of the dilution zone.

Meeting Name

25th Annual International Solid FreeForm Fabrication Symposium (2014: Aug. 4-6, Austin, TX)

Department(s)

Mechanical and Aerospace Engineering

Second Department

Materials Science and Engineering

Sponsor(s)

National Science Foundation (U.S.)

Comments

This research was supported by the National Science Foundation grants DMI-9871185 and IIP-0637796, the grant from the U.S. Air Force Research Laboratory contract # FA8650-04-C-5704

International Standard Serial Number (ISSN)

1053-2153

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2014 University of Texas at Austin -- Laboratory for Freeform Fabrication (LFF), All rights reserved.

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