Effect of B Content on Microstructure and Wear Resistance of Fe-Cr-C Surfacing Alloy
In order to further improve the wear resistance of Fe-Cr-C surfacing alloy,Fe-Cr-C wear-resistant surfacing alloy layers with different B addition amounts were prepared on the surface of Q235 steel by adjusting the amount of ferroboron powder added to the surfacing alloy powder using plasma powder surfacing technology. The effects of B addition amount on the microstructure,phase composition and wear resistance of Fe-Cr-C surfacing alloy were investigated using X-ray diffraction ( XRD),scanning electron microscopy ( SEM),energy-disper-sive spectroscopy ( EDS),abrasive wear tests and other analysis and testing methods. Results showed that when the addition amount of B was 0,the microstructure of the surfacing alloy was composed of dendritic Fe and chrysanthemum-like ( Fe,Cr) 7( C,B) 3+Fe eutectic structure. With the increase of B addition amount,the volume fraction of the ( Fe,Cr) 7( C,B) 3 hard phase in the surfacing layer increased. After the precipitation amount of the ( Fe,Cr) 7( C,B) 3 phase reached a certain value,the primary B0.7Fe3C0.3 phase was formed. When the B addition amount was 20.0％(mass fraction),a large amount of the (Fe,Cr)2B hard phase was precipitated. The hardness of the surfacing layer showed an overall trend of rising-steep drop-rising,and the hardness of the B-10 sample reached 63.1 HRC. The results of the abrasive wear test showed that the wear resistance of the surfacing alloy layer exhibited an trend of upward-flat-upward,and the wear resistance of the B-20 sample increased to 2.8 times that of the B-0 sample.
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