采用一种自制的WC-Co基合金作轧钢导卫辊材料,在轧制2 000 t 45钢后用SEM和洛氏硬度计等对其表面形貌及硬度进行了分析和研究.结果表明:合金的主要磨损机制是体积塑性变形、犁沟效应和疲劳磨损.硬度由使用前的56 HRC下降到49 HRC,硬度下降的主要原因是合金表面部分晶粒在(受到冲击滑动摩擦作用)高速剪切变形条件下发生了动态再结晶,形成了200nm左右的细小晶粒.微细晶粒形成符合一种渐进式位相向差亚晶合并再结晶机制.
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