CAJ | 학술논문

目的：提高截齿的耐磨性,延长其使用寿命。方法利用氩弧熔覆技术在35CrMnSi 钢表面制备 TiC 增强镍基复合涂层,分析涂层的显微组织和物相组成,测试涂层在室温下的显微硬度和耐磨性,并分析磨损机制。结果氩弧熔覆涂层的显微组织致密均匀,涂层与基体呈冶金结合,主要由 TiC,γ-Ni, M23 C6等物相组成。 TiC 颗粒呈块状,尺寸为1~2μm,弥散分布在涂层中。涂层硬度和耐磨性与(Ti+C)含量有关,熔覆粉末中(Ti+C)质量分数为20%时,涂层最高硬度可达1190HV,耐磨性达到基体的7.5倍。结论熔覆涂层的显微硬度较基体有显著提高。在室温冲击载荷作用下,熔覆涂层的主要磨损机制为显微切削磨损,可大大提高基体材料的耐磨性能。
목적：제고절치적내마성,연장기사용수명。방법이용아호용복기술재35CrMnSi 강표면제비 TiC 증강얼기복합도층,분석도층적현미조직화물상조성,측시도층재실온하적현미경도화내마성,병분석마손궤제。결과아호용복도층적현미조직치밀균균,도층여기체정야금결합,주요유 TiC,γ-Ni, M23 C6등물상조성。 TiC 과립정괴상,척촌위1~2μm,미산분포재도층중。도층경도화내마성여(Ti+C)함량유관,용복분말중(Ti+C)질량분수위20%시,도층최고경도가체1190HV,내마성체도기체적7.5배。결론용복도층적현미경도교기체유현저제고。재실온충격재하작용하,용복도층적주요마손궤제위현미절삭마손,가대대제고기체재료적내마성능。
Objective To improve the wear resistance of cutting tooth and to prolong its service life. Methods The TiC enhanced nickel-based composite coating was prepared on the surface of 35CrMnSi steel by argon arc cladding technique. The microstructure of the coating was analyzed by OM, SEM and XRD. Microhardness and wear resistance at room temperature of the composite coat-ing were examined by means of microhardness testing and impact abrasion resistance testing, respectively. Results The compact microstructure was obtained in the composite coating, and good metallurgical bonding could be obtained between the 35CrMnSi steel and cladding coating, with the main phases of TiC, γ-Ni and M23 C6 . The majority of TiC was blocky. The TiC particles was about 1 ~ 2 μm in size and the particles were dispersed in the coatings. The hardness and wear resistance of the coating were related with the (Ti+C) content. The highest hardness of 20% (Ti+C) coating was 1190HV. The relative wear resistance of the composite coating was 7. 5 times higher than that of 35CrMnSi steel. Conclusion The cladding coating reinforced by TiC particle showed ap-parently improved surface hardness as compared to 35CrMnSi steel. The wear mechanism of the composite coating under impact loading at room temperature was micro-cutting wear. The wear resistance of coating was greatly increased by argon arc cladding.