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采用等离子熔覆技术,通过对材料及工艺的参数优化,在现有耐磨材料的基础上研发新型铁基耐磨熔覆层材料。对研发的4种新型熔覆层进行性能评价,结果表明,B、C、D试样的冶金结合都比较好,熔覆层从熔合线往上的组织变化比较平缓,为平面晶、枝晶及等轴树枝晶;B试样熔覆层组织中气孔率极小,硬度最高,A试样在组织和硬度性能上都有缺陷;摩擦过程中摩擦因数均呈现4个变化阶段:迅速下降区、小幅上升区、波动区和稳定区,C试样的磨损量最少,磨损形貌最轻微;基底的磨损机制以黏着磨损、磨粒磨损以及疲劳磨损为主,熔覆层材料以磨粒磨损为主。
Using plasma cladding technology, through the optimization of materials and process parameters, we developed a new type of iron-based wear-resistant cladding material based on the existing wear-resistant materials. The results show that the metallurgical bonding of B, C and D specimens are good, the microstructure of the cladding layer from the fusion line to the top is relatively flat, and is flat and dendritic And the equiaxed dendrites. The microstructure of the specimen A and the hardness of the specimen A were all defective due to the smallest porosity and the highest hardness in the cladding of the specimen B. The friction coefficient of the specimen A showed four stages of change: the rapidly decreasing zone , Slightly rising zone, fluctuating zone and stable zone. The wear amount of C specimen is the least and the wear morphology is the least. The wear mechanism of the substrate mainly consists of adhesive wear, abrasive wear and fatigue wear. The cladding material is abrasive wear Mainly.