Y_2O_3对WC-B_4C激光合金化层裂纹与耐磨性能的影响  

Microstructure and Wear Resistance of Y_2O_3-WC-B_4C Laser Alloying Layer on 60CrMnMo Steel

作　　者：谭友宏[1,2] 刘敏[2] 马文有[2] 

机构地区：[1]广东工业大学材料与能源学院,广东广州510006 [2]广州有色金属研究院,广东广州510651

出　　处：《材料保护》2013年第12期13-16,6-7,共4页Materials Protection

摘　　要：目前,有关稀土氧化物粉末粒度大小及含量对激光陶瓷合金化层裂纹及耐磨性能影响的研究较少。以近纳米级Y2O3-WC-B4C粉末对60CrMnMo钢表面进行激光陶瓷合金化,以提高其耐磨性能。采用金相显微镜、扫描电镜、X射线衍射仪、显微硬度计、轮式磨耗试验机分析、考察了Y2O3含量对合金化层的组织、物相、硬度及耐磨性能的影响。结果表明:Y2O3使合金化层表面更加平整、光滑,表面裂纹减少、变细;合金化层硬度随着Y2O3含量增加而降低;合金化层物相主要有Fe-Cr,Cr23C6,B2W,B13C2等;随Y2O3含量增加,树枝晶减少,合金化层组织更均匀致密,磨损量先减小后增大;Y2O3含量为4%时,合金化层组织最细、耐磨性最好。Near nanoscale Y 2 O 3-WC-B 4 C powder was used for laser alloying of 60CrMnMo steel to improve the wear resistance.The effect of Y 2 O 3 content on the microstructure,phase,hardness and wear resistance of the alloying layer were analyzed with an optical microscope,a scanning electron microscope,an X-ray diffractometer,a microhardness meter,and a wheel-type friction and wear tester.Results indicated that Y 2 O 3 helped to improve the smoothness and brightness and reduce the amount and size of cracks of the alloying layer.The microhardness of the alloying layer significantly declined with increasing Y 2 O 3 content,and the alloying layer mainly consisted of Fe-Cr,Cr 23 C 6,B 2 W,and B 13 C 2.Moreover,the amount of dendrite decreased with increasing content of Y 2 O 3,the grain size initially rose and declined later therewith,while the wear mass loss of the alloying layer initially declined and rose later therewith.Particularly,as-prepared laser alloying layer containing 4% Y 2 O 3(mass fraction) exhibited the minimum grain size and the best wear resistance.

关 键 词：激光合金化 Y2O3-WC-B4C粉末 60CRMNMO钢 裂纹 耐磨性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]