表面技术
錶麵技術
표면기술
SURFACE TECHNOLOGY
2010年
1期
1-4
,共4页
20~#钢%激光熔覆%NiCrSiB%重熔%高温磨损
20~#鋼%激光鎔覆%NiCrSiB%重鎔%高溫磨損
20~#강%격광용복%NiCrSiB%중용%고온마손
20 steel%Laser cladding%NiCrSiB%Remelting%High temperature abrasive-wear
应用激光熔覆法,采用镍基NiCrSiB粉末,在20~#钢表面制备了熔覆涂层,并用激光重熔涂层.观察了熔覆-重熔层的形貌,检测了其相组成和高温耐磨性能,结果表明:所制得熔覆-重熔层组织均一、致密,与基体形成了良好的冶金结合;经重熔处理后,熔覆层表面的裂纹显著减少;熔覆-重熔层的硬度提高到基体的5倍,高温磨损率约为基体的1/3.熔覆-重熔层耐磨能力的增强除因其与基体形成了良好的冶金结合和硼化物、硼碳化物等析出相的强化作用外,也是重熔减少微裂纹的结果.
應用激光鎔覆法,採用鎳基NiCrSiB粉末,在20~#鋼錶麵製備瞭鎔覆塗層,併用激光重鎔塗層.觀察瞭鎔覆-重鎔層的形貌,檢測瞭其相組成和高溫耐磨性能,結果錶明:所製得鎔覆-重鎔層組織均一、緻密,與基體形成瞭良好的冶金結閤;經重鎔處理後,鎔覆層錶麵的裂紋顯著減少;鎔覆-重鎔層的硬度提高到基體的5倍,高溫磨損率約為基體的1/3.鎔覆-重鎔層耐磨能力的增彊除因其與基體形成瞭良好的冶金結閤和硼化物、硼碳化物等析齣相的彊化作用外,也是重鎔減少微裂紋的結果.
응용격광용복법,채용얼기NiCrSiB분말,재20~#강표면제비료용복도층,병용격광중용도층.관찰료용복-중용층적형모,검측료기상조성화고온내마성능,결과표명:소제득용복-중용층조직균일、치밀,여기체형성료량호적야금결합;경중용처리후,용복층표면적렬문현저감소;용복-중용층적경도제고도기체적5배,고온마손솔약위기체적1/3.용복-중용층내마능력적증강제인기여기체형성료량호적야금결합화붕화물、붕탄화물등석출상적강화작용외,야시중용감소미렬문적결과.
Ni-based alloy laser cladding layer and laser cladding-remelting layer were made on surface of 20 steel specimens using NiCrSiB powder. Phase characteristics, high temperature abrasive-wear behavior and surface morphologies after abrasive-wearing of the layers were investigated and the results show that laser cladding-remelting layer has dense microstructure, and has metallurgical combination with 20 steel substrate. There is much less cracks in laser cladding-remelting layer after remelting process. Micro-hardness and high temperature abrasive-wearing resistance of laser cladding layer are 5 and 3 times of 20 steel specimen separately. The improvement in high temperature abrasive-wearing resistance of the layer is due to the metallurgical combination; Strengthen effects of borides and boron-carbides precipitate phases and less harmful cracks.
