Open AccessStructure, phase composition and properties of borowolframed coating on steel 20 after microarc chemical heat treatment
Author(s) -
L. V. Davidyan,
Yu. M. Dombrovskii
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1029/1/012048
Subject(s) - materials science , tungsten , metallurgy , coating , eutectic system , intermetallic , boron , tungsten carbide , crystallite , carbide , boron nitride , phase (matter) , grain boundary , diffusion , composite material , microstructure , alloy , chemistry , physics , organic chemistry , thermodynamics
The results of the research devoted to the study of structure, phase composition, micro hardness and wear resistance of the borowolframed coating on steel 20, that was obtained by the method of microarc chemical heat treatment, are presented. With the help of microrentgenospectral analysis, it was found that during microarc borowolframing, both grain-boundary and trans crystallite diffusion of boron, carbon and tungsten occurs, which avoided the formation of brittle carboborid eutectics along the boundaries of plastic grains of the layer base. X-ray phase analysis in the diffusion coating found iron and tungsten borides Fe 2 B and W 2 B 5 , tungsten carbide WC, boron nitride BN and iron intermetallic with tungsten Fe 7 W 6 . The micro hardness of the borovolframed layer was 12-13 GPa. The wear rate of the borowolframed samples is reduced by 4.4 times in comparison with steel 20 in the initial structural state.