Influence of chromium on microstructure and sintering properties of FeNiMoCu system prealloyed powders

The chromium was added to the FeNiMoCu system prealloyed powders by using Cr–Fe powders way, powder mixtures were uniaxially pressed at 600 MPa, and then cold pressing sintering, sintering hot-forging, and re-sintering process were respectively carried out. Influence of chromium addition on the microstructure and properties of the FeNiMoCu system prealloyed powders were studied. Results show that chromium can be homogenous diffused into structure, and improved properties of structure by the appropriate sintering process. Oxidation of chromium can be restrained. Microhardness and apparent hardness increase with increasing chromium addition, sintering density and temperature. After hot-forging re-sintering, microstructure and properties of FeCrNiMoCu system PM materials is the better.