Advanced Materials & Processes

NOV-DEC 2013

Covers developments in engineering materials selection, processing, fabrication, testing/characterization, materials engineering trends, and emerging technologies, industrial and consumer applications, as well as business and management trends

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ity, high hardness, narrow heat affected zone (HAZ), and reduced cracking susceptibility[11, 12]. Acknowledgement: This work was supported by the National Science Foundation (NSF-CMMI 1010494 and NSF-CMMI 0969249) and American Chemical Society Petroleum Research Fund (ACS PRF 50283-DNI10). The article is based in part on the masters/doctoral research work of For more information: Narendra Dahotre, FASM, is professor and chairman, Laboratory for Laser Materials Processing and Synthesis, Dept. of Materials Science and Engineering, University of North Texas, 1155 Union Circle #305310, Denton, TX 76203-5017, 940/565-2031,, References 1. N.B. Dahotre, Lasers in Surface Engineering, ASM Intl., 1998. 2. D.B. Narendra, Multiscale laser materials engineering: Energy-efficient processing and materials performance, Nanomaterials and Energy Jour., 2, p 64–70. doi:10.1680/nme.13.00003, 2013. 3. J.R. Davis, Surface Engineering for Corrosion and Wear Resistance, ASM Intl., 2001. 4. N.B. Dahotre and A.N. Samant, Laser Machining of Advanced Materials, CRC Press/Balkema, London, UK; Boca Raton, Fla., 2011. 5. N.B. Dahotre and S.P. Harimkar, Laser Fabrication and Machining of Materials, Springer, New York, N.Y., 2008. 6. H.D. Vora, et al., Dilution of molybdenum on aluminum during laser surface alloying, J. Alloys Compounds, 570, p 133–143, doi:10.1016/j.jallcom.2013.03.115, 2013. 7. H.D. Vora, et al., Design and Optimization of Microstructure for Improved Corrosion Resistance in Laser Surface Alloyed Aluminum with Molybdenum, Intl. J. Precision Engrg. & Mfg. (in press), 2013. 8. S.N. Dahotre, et al., An Integrated Experimental and Computational Approach to Laser Surface Nitriding of Ti-6Al-4V, Applied Surface Science, doi:10.1016/j.apsusc.2013.01.151, 2013. 9. S.N. Dahotre, et al., Laser Induced Nitrogen Enhanced Titanium Surfaces for Improved Osseo-integration, Annals of Biomedical Engineering (in press), 2013. 10. R. Ravi Shanker, et al., Laser Coating of Molybdenum on Aluminum for Corrosion Protection, Corrosion Science, 2012. 11. C.W. Draper and J.M. Poate, Laser Surface Alloying, Intl. Metals Review, 30, p 85–108, 1985. 12. J. Dutta Majumdar and I. Manna, Laser processing of materials, Sadhana, 28, p 495–562, doi:10.1007/BF02706446, 2003. ADVANCED MATERIALS & PROCESSES • NOVEMBER-DECEMBER 2013 HTPRO Among other nonequilibrium processes (e.g., sputter deposition, ion implantation, and vapor deposition), LSM is more beneficial because it does not require high in-process vacuum, can produce complex structures, and can fabricate thick coatings (>50 μm). Therefore, laser surface alloying, laser cladding, and composite coating based on LSM provide a new path to enhance surface resistance to corrosion, abrasion, and wear. For example, a hard titaniumcarbide (TiC)/Al composite coating (450 kg/mm2 Knoop hardness) is formed on aluminum (100 kg/mm2 Knoop hardness) to enhance mechanical and tribological properties (Fig. 6). HTPRO Hitesh Vora, Ravi Shanker Rajamure, Shravana Katakam, and YeeHsien Ho at the University of North Texas. 11 47

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