The Influence of B Content on the Microstructure and Hardness of in Situ Formed TiC-TiB2 Reinforced Fe-Based Hardfacing Coatings

Authors : Bülent Kılınç

Pages : 327-340

Doi:10.55546/jmm.1584040

View : 18 | Download : 15

Publication Date : 2024-12-20

Article Type : Research Paper

Abstract :In this study, Fe-Cr-Ti-(B, C) based hardfacing coatings with different ratios were produced on DIN St37 steel plate surface using tungsten inert gas (TIG) welding method. It was investigated how increasing boron content affects the morphology of in situ TiC-TiB2 phases expected to form in situ in the coating. The effects of these changes in microstructure on the microhardness of the hardfacing coatings were also determined. X-ray analyses revealed that phases such as α-(Fe, Cr), M2B, TiC, and M7C3 were formed in coatings with 10% B content, and TiB2 phase was also detected in coatings with 20% and 30% boron content. In addition, it was determined that the volume fraction ratio of TiB2 phase increased in the coating microstructures and it was synthesised as a rod-like structure. Accordingly, the microhardness values of the hardfacing coatings increased significantly. The highest microhardness found was 1045 HV0.2 for the coating produced from 30B-Ti composition, which is about 4.5 times higher than the base steel (234 HV0.2).
Keywords : In situ, TiC-TiB2, Sert dolgu, yüzey alaşımlama, sertlik, aşınma