半固态钢铁材料流变轧制的试验

利用自行设计的半固态钢铁材料直接轧制系统对弹簧钢（60Si2Mn)与奥氏体不锈钢（1Cr18Ni9Ti）进行了半固态浆料直接轧制试验。结果表明：半固态浆料在轧制过程中，液固相会产生分离，导致液固相偏析，影响轧制产品的组织及性能；只有当固相率达到一定数值时，固相颗粒才会发生塑性变形；仅经过一道次轧制，但轧件的力学性能也相当高。同时发现，浆料与轧辊温差等因素将导致轧件产生表面裂纹；若轧件宽向上没有约束，一定会产生边裂。

Experimental Study on Semi-solid Steels for Rheorolling

The experimental study on the familiar 6OSi2Mn and lCr18Ni9Ti materials for rheorolling in the semi-solid state using the directly rolling system designed by oneself has done. Experimental results show that the segregation of liquid occurs when the semi-solid slurry is rolled, which influence the microstructure and mechanical properties of workpiece under room temperature. The globular solid particles don't present plastic deformation unless high solid fraction. At the same time, the mechanical properties of workpiece is good while the semi-solid slurry is rolled a pass and no other treatment. Surface cracks found on the surface of workpiece are caused by temperature difference between the slurry and the roller or other factors. And it is necessary to restrict the flow of the slurry in the width direction during rolling for avoiding edge cracks.