Effect of boron content on microstructure and mechanical properties of Fe2B-Mo2FeB2-based cermets

doi:10.13251/j.issn.0254-6051.2021.10.010

Abstract

Abstract: Fe₂B-Mo₂FeB₂-based cermets with 4 different boron contents were prepared by vacuum sintering process, and the effect of boron content on sintering characteristics, microstructure and mechanical properties of the cermets was investigated. The results show that all the specimens mainly consist of Fe₂B, Mo₂FeB₂and Fe₃B phases. With the increase of boron content, the content of liquid phase L1 formed during the sintering process gradually decreases, and the optimal sintering temperature of the cermet gradually increases. Moreover, the hardness and transverse rupture strength of the cermets are also increased, and the maximum values of hardness and transverse rupture strength are 88.52 HRA and 685.74 MPa, respectively. The composite microstructure of Mo₂FeB₂ and Fe₃B (or Fe₂B phase) can extend the crack propagation path during the fracture process, and the pulling out of long rod-shaped Mo₂FeB₂ phase from Fe₃B phase (or Fe₂B phase) is beneficial to the improvement of transverse rupture strength of the cermets.

Key words: cermets, Fe₂B phase, Mo₂FeB₂ phase, microstructure, transverse rupture strength

CLC Number:

TG148

Wei Xiang, Peng Guangwei, Yu Hongbin, Liu Baogang, Wang Li, Kong Lingnan. Effect of boron content on microstructure and mechanical properties of Fe₂B-Mo₂FeB₂-based cermets[J]. Heat Treatment of Metals, 2021, 46(10): 58-64.

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Effect of boron content on microstructure and mechanical properties of Fe₂B-Mo₂FeB₂-based cermets

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