Features of formation of the structure and proper-ties of surface layers reinforced with flux-cored wires based on the Fe-Ti-B-C system

Abstract

In this work it was established that the structure of surfacing materials based on the Fe-Ti-B-C system depends on the brand of powders that were used for production of flux-cored electrodes. Two experimental electrodes of Fe-Ti-B-C were studied using two different brands of Ti powders. The brands were PHT and PTM, that are obtained by various methods. Microstructure of the coating with PHT Ti are characterized with the structure without hard TiB2 and TiC phases, which is a proof of the absence of “in-situ” synthesis reaction during FCAW surfacing. Such structure is also characterized by low hardness. Microstructure of the coating with PTM Ti consist of uniformly distributed hard phases in metal matrix, which is a proof of “in-situ” synthesis reaction during FCAW surfacing. The hardness of such structure is higher than the hardness of the previous example. The experiment shows that using powders of different brands can significantly affect the structure and physical and mechanical properties of the surfacing.