Microstructures and wear resistance of high boron and low carbon ferroalloy using hybrid powder/wire overlaying method

The high boron alloy surfacing layer was easily cracked due to its insufficient toughness by using hybrid powder/wire overlaying method.In order to explore the cracked mechanism,the microstructures and the wear resistance of the samples with different boron contents were studied.Further,phases analysis,microhardness,macrohardness and wear test were also carried out.The boron content depended microstructures were observed.The precipitation of the Fe₂B,Fe₃（C,B）,Fe₂₃（C,B）₆ were increased with the increase of boron content.It was found that the wear resistance was independent of the macrohardness as the macrohardness increased firstly and then remained steady at ~62 HRC.However,the wear resistance was depended on the boron contents,and which increased with the increase of the boron contents.The abrasive loss mechanism changed from plastic deformation removal to fracture removal.