Journal
JOURNAL OF LASER APPLICATIONS
Volume 27, Issue -, Pages -Publisher
AMER INST PHYSICS
DOI: 10.2351/1.4898647
Keywords
additive manufacturing; laser metal deposition (LMD); metal matrix composites; oxidation
Funding
- Sino-German Centre [GZ712]
- National Natural Science Foundation of China [51322509, 51104090]
- Outstanding Youth Foundation of Jiangsu Province of China [BK20130035]
- Program for New Century Excellent Talents in University [NCET-13-0854]
- Science and Technology Support Program (The Industrial Part), Jiangsu Provincial Department of Science and Technology of China [BE2014009-2]
- Program for Distinguished Talents of Six Domains in Jiangsu Province of China [2013-XCL-028]
- Fundamental Research Funds for the Central Universities [NE2013103]
- Qing Lan Project, Jiangsu Provincial Department of Education of China
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The laser metal deposition (LMD) additive manufacturing process was applied to produce TiC/Inconel 625 composite parts. The high-temperature oxidation performance of the LMD-processed parts and the underlying physical/chemical mechanisms were systematically studied. The incorporation of the TiC reinforcement in the Inconel 625 improved the oxidation resistance of the LMD-processed parts, and the improvement function became more significant with increasing the TiC addition from 2.5wt. % to 5.0 wt. %. The mass gain after 100 h oxidation at 800 degrees C decreased from 1.4130 mg/cm(2) for the LMD-processed Inconel 625 to 0.3233 mg/cm(2) for the LMD-processed Inconel 625/5.0wt. % TiC composites. The oxidized surface of the LMD-processed Inconel 625 parts was mainly consisted of Cr2O3. For the LMD-processed TiC/Inconel 625 composites, the oxidized surface was composed of Cr2O3 and TiO2. The incorporation of the TiC reinforcing particles favored the inherent grain refinement in the LMD-processed composites and, therefore, the composite parts possessed the sound surface integrity after oxidation compared with the Inconel 625 parts under the same oxidation conditions. The LMD-processed TiC/Inconel 625 composites exhibited the excellent oxidation resistance under the oxidation temperature of 800 degrees C. A further increase in the oxidation temperature to 1000 degrees C caused the severe oxidation attack on the composites, due to the unfavorable further oxidation of Cr2O3 to CrO3 at the elevated treatment temperatures. (C) 2014 Laser Institute of America.
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