|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Building the Pathway towards Process and Material Qualification
||Microstructure and Mechanical Properties of Laser Deposited Ni/WC Metal Matrix Composite Coatings
||Abhishek Ramakrishnan, Amrinder Singh, Guru Prasad Dinda
|On-Site Speaker (Planned)
The current study the effect of laser metal deposition of WC reinforced Nickel composite coatings was investigated for the application of hardfacing coating on copper. Ni/60WC MMC were fabricated on the surface of copper with a buffer layer of hastelloy C-276. An additional set of samples were deposited on a 1020 mild steel substrate. Metal deposition was carried out by a circular laser spot of 2 mm diameter to melt the metal powder particles. Three principal experiments were conducted in a systematic order to understand the microstructural evolution of Ni/60WC MMC. A multi-track, single track deposit and re-melting of the as deposited surface were systematically investigated by optical microscopy which revealed homogenous distribution of WC particles. Microstructural morphology of Ni/60WC particles were analyzed by scanning electron microscopy. The results revealed microstructural element such as equiaxed structure, columnar dendrites, eutectic structure and several other complex carbide structures. It was observed that the presence of three principle phases in the deposit consisted of the primary WC, dendritic Ni and a eutectic structure. Microhardness of the laser deposited samples indicated the gradual variation in hardness as the deposition transits from a highly conductive soft material to a hard facing coating. Homogenization of WC in Ni composite coating was well realized in this study.
||Planned: Supplemental Proceedings volume