离心机转速对再生复合材料辊环组织和性能的影响

Influence of Centrifuge Rotational Speed on Structure and Properties of Recycled Composite Materials Roll

利用废旧辊环,通过重熔和离心铸造法制备了再生复合材料辊环,重点研究了离心机转速为800r/min和1000r/min时制备的再生复合材料辊环的组织和性能。样品的微观组织检测表明:再生复合材料辊环由WC颗粒大量分布的外层和Fe-C合金内层组成,离心机转速高的外层内WC增强颗粒体积分数较大。力学性能测试表明:800r/min转速下制备的再生复合材料辊环,其外层和内层的硬度分别达到HRC49、HRC42,冲击韧性分别为3.1J/cm2、5.1J/cm2。离心机转速提高到1000r/min时,外层和内层的硬度分别增加达到HRC58、HRC49,冲击韧性分别降低为2.3J/cm2、4.1J/cm2。

Recycled composite materials roll was made from spent roll by remehing and centrifugal casting. The structure and properties of the recycled roll prepared at centrifuge rotational speed of 800 r/min and 1 000 r/min was investigated in detail. The microstructure analysis shows that the recycled roll consists of the mass WC particles distributed outer layer and Fe-C alloyed substrate. The volume fraction of WC particles in outer layer is larger when the centrifuge rotational velocity is higher. The mechanical properties test indicates that when the rotational velocity is 800 r/min, the hardness of the outer layer and substrate is HRC49 and HRC42, the impact toughness of the outer layer and substrate is 3.1 J/cm^2 and 5.1 J/cm^2, respectively. When the rotational velocity is up to 1 000 r/min, the hardness of the outer layer and substrate is HRC58 and HRC49, the impact toughness of the outer layer and substrate is 2.3 J/cm^2 and 4.1 J/cm^2, respectively.