Affiliation:
1. Xinjiang Unviersity
2. Lanzhou University of Technology
Abstract
Laser cladding technique was used to form Ni3(Si,Ti) intermetallic coating by Nb addition
on Ni-based superalloy substrate. The coating was investigated by optical microscopy and X-ray
diffraction (XRD). The clad coating was dense, compact and smooth. An excellent bonding between
the coating and the substrate was ensured by a strong metallurgical interface. Ni3(Si,Ti) phase was
detected in all of the claddings, and NbNi3, Nb3Ni2Si were detected in Nb additional experiments. The
peaks intensity of Nb3Ni2Si and NbNi3 increased with the increasing of Nb content. The Ni3Nb and
Nb3Ni2Si were formed when Nb was beyond its solubility in the L12 Ni3(Si,Ti). The average
microhardness of the coating was improved with the increasing of the Nb content. The microhardness
was up to 530Hv when the atom percentage of Nb addition reached 5%, and it was much greater than
that of Ni-based superalloy substrate.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science