Microstructure and growth mechanism of surfacing layer under combined effect of B and Ti
WANG Yu
GOU Jian
LIU Zheng-jun
Abstract：In order to investigate the microstructure and growth mechanism of surfacing layer under the combined effect of B and Ti, the Fe-Cr-C-B-Ti surfacing alloy was prepared with the self-developed iron-based wear resistant flux-cored wire through the self-protecting open arc surfacing method. The microstructure and growth mechanism of surfacing layer were analyzed with optical microscope, scanning electron microscope (SEM) and X ray diffractometer (XRD). The results show that both TiC and M23(C,B)6 phases are synthesized in an in-situ way. With increasing the Ti content, the quantity of TiC phase in the microstructure gradually increases, and the TiC phase distributes along the grain boundary. The increase of B content makes the quantity of TiC phase unstable. As a nucleation substrate, the TiC phase can provide the condition for the epiphytic growth of M23 ( C, B ) 6 phase. Through the in-situ synthesis of TiC and M23 ( C,B) 6 hard phases, the comprehensive properties of surfacing layer can be improved.
Keywords：combined effectflux-cored wiresurfacingin-situ synthesismicrostructuregrowth mechanismnucleation substrateepiphytic growth
Publication Date：2017-11-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 635-639 )