High temperature dry sliding wear behavior of boriding strengthened Fe-based powder metallurgy material

doi:10.13251/j.issn.0254-6051.2020.01.041

Abstract

Abstract: Fe-based powder metallurgy material having boronizing layer was prepared with directly sintering at 850, 950 and 1050 ℃ for 3, 5 and 10 h respectively by pack powder boriding method. The morphology and the thickness of the boronizing layer were observed and measured by metallographic microscope and scanning electron microscope, and the phase composition of the boronizing layer was analyzed by X-ray diffractometer. The bond strength of the boronizing layer to the substrate was evaluated by Rockwell-C adhesion test. The friction and wear performance of the specimens was measured by HT-1000 high temperature friction and wear tester. The results show that single-phase Fe ₂ B is formed by boronizing at 850 ℃ and 950 ℃, while dual-phase (FeB+Fe ₂ B) boronizing layer is formed at 1050 ℃. Both the adhesion test and the high-temperature wear test results show that the layer of the specimen borided at 950 ℃ for 5 h is the most tightly bonded to the substrate, with the highest resistance to wear and oxidation. In the high-temperature friction and wear experiment, the fatigue spalling and oxidative wear caused by microcracks are the main wear mechanisms of the boronizing specimens, while the un-boronizing specimens show severe oxidation and plastic deformation.

Key words: powder metallurgy, pack boriding, adhesion test, ery sliding wear, high temperature wear

CLC Number:

TG174.1

Fang Huimin, Zhang Guangsheng, Xia Liansen. High temperature dry sliding wear behavior of boriding strengthened Fe-based powder metallurgy material[J]. HTM, 2020, 45(1): 210-217.

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