Effect of Mechanical Surface Treatments on Ti-6Al-4V Direct Metal Deposition Parts
The effect of surface treatments, including aggressive milling, rotational burnishing, and nonrotational burnishing, on Ti-6Al-4V DMD (direct metal deposition) parts was investigated. Particular emphasis is on the question of whether these surface treatments could induce the plastically deformed and work-hardened layer that was proven to enhance the fatigue resistance of titanium alloys and was a key step for recrystallization. Through the microhardness examination and microstructure analysis, it was found that the rotational burnishing process was able to work harden the material deeper than 1000 μm, while the work-hardened layer generated by the nonrotational process was 600 μm and that for aggressive milling was less than 10 μm. Because surface finish is another critical factor for the resistance of fatigue crack initiation, it was also evaluated for these treatments.
Y. Bao et al., "Effect of Mechanical Surface Treatments on Ti-6Al-4V Direct Metal Deposition Parts," Journal of Manufacturing Processes, Elsevier, Jan 2008.
The definitive version is available at http://dx.doi.org/10.1016/j.jmapro.2009.02.002
Materials Science and Engineering
Mechanical and Aerospace Engineering
Air Force Research Laboratory (Wright-Patterson Air Force Base, Ohio)
Boeing Company. Phantom Works
National Science Foundation (U.S.)
Spartan Light Metal Products
Keywords and Phrases
Critical Factors; Direct Metal Deposition; Fatigue Crack Initiation; Fatigue of Materials; Fatigue Resistance; Mechanical Surface Treatment; Recrystallizations; Surface Finishes; Ti-6Al-4v; Titanium; Titanium Alloys
Article - Journal
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