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Einfluss des Aluminiumgehaltes auf das Erstarrungsgefüge und die Eigenschaften von einer FeCrBAl‐Legierung
Author(s) -
Yu Z.,
Fu H.,
Jiang Y.,
Cen Q.,
Lei Y.,
Zhou R.,
Guo H.
Publication year - 2012
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.201200058
Subject(s) - eutectic system , materials science , microstructure , rockwell scale , metallurgy , aluminium , alloy , ferrite (magnet) , austenite , vickers hardness test , optical microscope , scanning electron microscope , pearlite , composite material
The microstructures and mechanical properties of eight kinds of Fe‐Cr‐B‐Al alloys containing X wt.%Al‐0.35 wt.%C‐10.0 wt.%Cr‐1.4 wt.%B‐0.6 wt.%Si‐0.8 wt.%Mn (X = 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 4.0) were studied by means of optical microscopy (OM), scanning electron microscopy (SEM), X‐ray diffraction (XRD), Rockwell hardness and Vickers micro‐hardness testers. The results indicate that the as‐cast microstructure of aluminium‐free sample consists of the martensite, austenite and eutectic borocarbides, and the eutectic borocarbides are the mixture of (Fe, Cr) 2 B and (Cr, Fe) 7 (C, B) 3 , and its hardness reaches 65 HRC. When a small amount of aluminium element (Al ⪇ 1.0 wt.%) is added, the phase composition has no significant change, and the hardness excels 65 HRC. When the concentration of aluminium reaches 1.5 wt.%, the matrix of Fe‐Cr‐B‐Al alloy becomes pearlite and δ‐ferrite, leading to a sharply decrease of the hardness. The proportion of ferrite goes up along with increasing aluminium concentration, and the hardness of Fe‐Cr‐B‐Al alloy has slight decrease.