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High Temperature Tribological Behavior of Borocarburized Layer on Q235 Steel by Zhengang YANG; Wenping LIANG; Yanlin JIA; Qiang MIAO; Zheng DING; Haiyang YU is a Engineering article available to read on EtoBox.

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A borocarburized layer was successfully fabricated on the surface of Q235 low-carbon steel via double glow treatment to improve the wear resistance at elevated temperature. The phase composition and microstructure of borocarburized layer were investigated by XRD and SEM. The microhardness of borocarburized layer from the surface to the substrate were detected. And the tribological behaviors of borocarburized layer and substrate were investigated under the dry-sliding against ZrO2 ball at three temperatures. The results indicate that the borocarburized layer consists of an outermost boride layer and a transition layer of carburized layer. The boride layer with main phase of Fe2B has a high hardness around 1700 HV, and the hardness of transition layer with main phase of Fe5C3 is around 600 HV. The novel gradient structure of an outermost boride layer and inner carburized layer is design in this research decreases the hardness mismatch of coating to prevent the boride layer peeling off. The friction coefficient and specific wear rate of borocarburized layer are much lower than that of substrate at the same temperature. In addition, the wear mechanism of substrate is mainly fatigue wea

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Author

Zhengang YANG; Wenping LIANG; Yanlin JIA; Qiang MIAO; Zheng DING; Haiyang YU

Publisher

Kaunas University of Technology (KTU)

Published

2021

Language

EN

Field

Engineering (Physical Sciences)