FORMATION OF THE HIGH CHROMIUM WHITE IRON PARTS WITH GRADIENT STRUCTURE VIA SEMI-SOLID METAL EXTRUSION
半固态挤压形成高铬铸铁梯度组织材料

The high chromium white iron with equiaxed primary structure was extruded at semisolid state. The liquid phase was squeezed out by pressure. After solidification, the volume percentage of the eutectic structure increases gradually from the center to the perimeter. Test shows that the extrusion temperatures have great effect on the structure of the extruded sample. The compact toughness at the center of the sample and the wear resistance at the perimeter of the sample are improved.