Effects of shape and distribution of M7C3 on wear resistance of Fe based composite coating

The effects of shape, distribution and amounts of hardness phase M₇C₃(such as (Fe, Cr)₇C₃ and Cr₇C₃)on wear resistance of surfacing metal with the method of electro-magnetic stirring was researched.After plasma with magnetic field, the XRD, SEM, wear loss tests, micro-hardness tests were used to analysis the properties of surfacing metal.It's found that the distribution of hard phases of M₇C₃ is changed with magnetic parameters from no alignment distribution to hexagon alignment distribution, and wear resistance of surfacing metal is improved gradually.The optimal result is obtained when magnetic current is 3 A and magnetic frequency is 10 Hz, and the distribution of M₇C₃ is almost regular hexagon alignment in surfacing metal.The experimental results indicate that the hard phases with regular hexagon alignment distribution exhibits better wear performance than those with no alignment distribution of surfacing metal with proper magnetic parameters.