Abstract
Selective laser melting (SLM) process was used to prepare the nanocrystalline titanium carbide (TiC)-reinforced Inconel 718 matrix bulk-form nanocomposites in the present study. An in-depth relationship between SLM process, microstructures, properties, and metallurgical mechanisms was established. The insufficient laser energy density (η) input limited the densification response of shaped parts due to the formation of either larger-sized pore chains or interlayer micropores. The densification of SLM-processed part increased to a near-full level as the applied η was properly settled. The TiC reinforcements generally experienced successive changes from severely agglomerated in a polygon shape to the uniformly distributed with smoothened and refined structures on increasing the applied η, while the columnar dendrite matrix exhibited strong epitaxial growth characteristic concurrently. The optimally prepared fully dense part achieved a high microhardness with a mean value of 419 HV0.2, a considerably low friction coefficient of 0.29, and attendant reduced wear rate of 2.69 × 10−4 mm3/N m in dry sliding wear tests. The improved densification response, SLM-inherent nonequilibrium metallurgical mechanisms with resultant uniformly dispersed reinforcement microstructures, and elevated microhardness were believed to be responsible for the enhancement of wear performance.
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ACKNOWLEDGMENTS
The authors gratefully appreciate the financial support from the National Natural Science Foundation of China (No. 51322509 and No. 51104090), the Outstanding Youth Foundation of Jiangsu Province of China (No. BK20130035), the Program for New Century Excellent Talents in University (No. NCET-13-0854), the Program for Distinguished Talents of Six Domains in Jiangsu Province of China (No. 2013-XCL-028), the Fundamental Research Funds for the Central Universities (No. NE2013103), and the Qing Lan Project, Jiangsu Provincial Department of Education, China. Qingbo Jia appreciates the support from the Foundation of Graduate Innovation Center in Nanjing University of Aeronautics and Astronautics (No.kfjj20130218).
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Jia, Q., Gu, D. Selective laser melting additive manufacturing of TiC/Inconel 718 bulk-form nanocomposites: Densification, microstructure, and performance. Journal of Materials Research 29, 1960–1969 (2014). https://doi.org/10.1557/jmr.2014.130
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DOI: https://doi.org/10.1557/jmr.2014.130