Abstract
The most effective carbide-forming elements titanium and niobium were added into hardfacing alloy. Formation and composition of carbides in the hardfacing alloy were investigated by means of optical microscope (OM), scanning electron microscope (SEM), X-ray diffraction (XRD) and energy-dispersive spectrometer (EDS). Hardness and impact toughness of the hardfacing alloy were measured. The thermodynamics and formation mechanism of carbides were also discussed. It is found that the carbides consist of TiC and NbC which are able to form directly from welding pool during the welding process. The formation mechanism of carbides involves nucleation of TiC followed by epitaxial precipitation of NbC on the surface of TiC. The formation of titanium and niobium carbides can obviously refine the microstructure and deplete the carbon in the matrix. The microstructure transforms to well-distributed carbides and a tough martensite matrix, contributing to a good combination of high hardness and high toughness in the hardfacing alloy.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
