Title: Microstructure and wear resistance of Fe-based hardfacing alloys reinforced by borides
Abstract:In order to improve the wear resistance of parts of machines in enviroments where they undergo severe conditions,Fe-based hardfacing alloy reinforced with borides were prepared under plasma transferre...In order to improve the wear resistance of parts of machines in enviroments where they undergo severe conditions,Fe-based hardfacing alloy reinforced with borides were prepared under plasma transferred arc weld surfacing process(PTA).The microstructure and borides morphology were investigated by means of OM,SEM and XRD,which was compared to the Fe-Cr-C hardfacing alloy.The results showed that the microstructure of the matrix and contents and distribution were changed as a result of the addition of 4.5% B in hardfacing alloys,which led to the improvement of wear resistance significantly.The borides consisted of high volume fraction of rosette M 23(C,B) 6 and little volume fraction of blocky M 7(C B) 3,the content of BC 4 and Cr 2 B was very little.The abrasion experimental results showed that the wear resistance firstly increased and afterwards decreased as the B content increased,the microstructure characteristic with a high volume fraction of borides with high microhardness were distributed in the martensite and austenite matrix with high strength and toughness as the addition of 4.5%B in Fe-Cr-C hardfacing alloy,which suggested that the hardfacing layers had a excellent wear resistance and its abrasion mass was only 1/6 of the hardfacing alloy with no addition of B.Read More
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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