Paper Title:

In Situ Formation of NbC Reinforced Ni3Si Intermetallic Compounds by Laser Cladding

Periodical Key Engineering Materials (Volumes 368 - 372)
Main Theme High-Performance Ceramics V
Edited by Wei Pan and Jianghong Gong
Pages 1351-1353
DOI 10.4028/www.scientific.net/KEM.368-372.1351
Citation Yao Ning Sun et al., 2008, Key Engineering Materials, 368-372, 1351
Online since February, 2008
Authors Yao Ning Sun, Ding Fan, Yu Feng Zheng, Min Zheng, Jian Bin Zhang
Keywords Laser Cladding, Microstructure, Niobium Carbide
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Abstract

Laser cladding technique was used to form Ni3Si intermetallic composite coating reinforced by in-situ formation NbC particles on Ni-based superalloy substrate. The process parameters were optimized to obtain cladding. The effect of Nb-C addition to the microstructure of the coating was investigated. The morphology of reinforcement particles was discussed. The experimental results showed that an excellent bonding between the coating and the substrate was ensured by a strong metallurgical interface. The clad coating was very good and free from cracks and pores. The microstructure of the coating was mainly composed of Ni(Si), Ni3(Si, Nb) and NbC. The NbC particles were formed by in-situ reaction between Nb and C during laser cladding process. NbC particles were homogeneously distributed in the composite material. Moreover, the maximum size of NbC particles was more than 4 μm.