半固态挤压形成高铬铸铁梯度组织材料

FORMATION OF THE HIGH CHROMIUM WHITE IRON PARTS WITH GRADIENT STRUCTURE VIA SEMI- SOLID METAL EXTRUSION

通过挤压具有等轴状初晶组织的半固态高铬铸铁,样品的液相在应力作用下被挤向表面,凝固后形成了共晶组织沿径向由内向外呈现出体积分数逐步增加的梯度组织,实验表明挤压温度对挤压后共晶组织分布有明显的影响.

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.