作　　者： ; ; ; ; ; ;

机构地区： 中南大学材料科学与工程学院

出　　处： 《机械工程学报》 2005年第4期212-214,219,共4页

摘　　要： 运用扫描电镜、能谱分析、洛氏硬度计、光学分析天平以及XRD等手段,研究一种轧钢导卫用WC-Co基合金在轧钢过程中的物理性能变化及表层的组织变化、磨损情况和磨损机理。合金在1000℃左右的温度下轧制2000t45钢之后,发现使用前后的密度并没有发生明显变化,但硬度却由使用前的56HRC下降到了使用后的49HRC。分析发现,硬度下降的原因是因为合金中部分大晶粒在使用过程中发生了动态再结晶,形成了许多尺寸为200nm左右的纳米晶。另外,对合金的磨损情况研究表明,其主要的磨损机制是塑性剪切变形和犁沟效应,其次粘着磨损和疲劳磨损也是合金表面磨损机制之一。最后还建立了犁沟效应和疲劳磨损模型。 SEM, EDX, Rockwell hardness tester, analytical balance and XRD are used to study the evolution of the microstructure and wear mechanism of the worn surface of a WC-Co based alloy used for guider roller in the process of steel-bar rolling. After the alloy has been used for rolling 2 000 t of 45 steel at about 1 000℃, the density maintains almost the same while the hardness decreases from 56 HRC to 49 HRC. Further investigation shows that some big crystals dynamically recrystallized and nano-grains with the size of about 200 nm formed in these big ones in the process of steel rolling, which contributes to the decreasing of hardness of the alloy. The results also show that the main wearing mechanism of the alloy includes plastic shearing and ploughing. Additionally, abrasion and fatigue also contribute to the wearing of the alloy. At last, models for the explaination of fatigue and ploughing wearing are presented.

关 键 词： 基材料 导辊 纳米晶粒 磨损机制

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]