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Einfluss der Bor‐Konzentration auf die Mikrostruktur und die Eigenschaften von FeCrB‐Legierungen
Author(s) -
Zhang H.,
Fu H.,
Jiang Y.,
Guo H.,
Lei Y.,
Zhou R.,
Cen Q.
Publication year - 2011
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201100753
Subject(s) - rockwell scale , boron , microstructure , materials science , eutectic system , boride , boron carbide , metallurgy , alloy , vickers hardness test , optical microscope , scanning electron microscope , indentation hardness , phase (matter) , carbide , composite material , chemistry , organic chemistry
In this article, the effect of boron concentration (B = 0, 0.4, 0.8, 1.4 and 2.0 respectively) on the solidification microstructure and properties of Fe‐Cr‐B alloy containing 0.35% C, 10–12% Cr, 0.5–0.8% Si, and 0.7–1.0% Mn was studied by means of the optical microscope (OM), the scanning electron microscope (SEM), X‐ray diffraction (XRD), Rockwell hardness and Vickers hardness tester. The results indicate that the microstructure of boron‐free sample consists of the martensite, and its hardness reaches 59.2 HRC. When a small amount of boron element was added, the eutectic phase of network structure generated along the grain boundary. The amount of eutectic phase increases when the boron concentration increases. Moreover, the eutectic phase is the mixture of boride and boron carbide. The boride is Fe 2 B and the boron carbide is (Cr, Fe) 7 (C, B) 3 . Compared with boron‐free sample, the Rockwell hardness of the samples with different boron concentrations are all higher, above 62 HRC, and the hardness grow up with the increase of boron concentration. When the boron concentration reaches to 1.4%, the Rockwell hardness of the alloy is 65.7 HRC, which is the highest in this study. When the boron concentration rises to 2.0%, the hardness has no obvious change.

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