Open AccessMicrostructural and tribological characterization of niobium boride coating produced on AISI 1020 steel via multicomponent boriding
Author(s) -
Anael Preman Krelling,
Elisangela Aparecida dos Santos de Almeida,
César Edil da Costa,
Júlio César Giubilei Milan
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ab7266
Subject(s) - boride , boriding , materials science , metallurgy , niobium , abrasion (mechanical) , coating , abrasive , tribology , composite material
Niobium boride coating was produced on AISI 1020 steel by multicomponent boriding process. Boriding treatment at1000 °C for 4 h was followed by thermo-reactive diffusion technique at 1000 °C for 6 h under argon atmosphere. Microabrasive wear tests were carried out using SiC abrasive particles at slurry concentrations of 0.5 and 1.0 g cm −3 . Normal loads of 0.49 and 0.98 N were used. NbB and Nb 5 B 6 phases were identified by XRD analysis. The niobium boride coating thickness was 2.0 ± 0.5 μ m and its hardness was 1360 ± 200 HK 0.01 . Owing to the presence of a porous region on the niobium/iron boride layers the abrasive wear resistance decreased comparing to the borided and untreated AISI 1020 steel. Rolling abrasion was the main wear mechanism observed.