作　　者： ; ; ; ; ; ;

机构地区： 北京航空制造工程研究所

出　　处： 《金属学报》 2014年第5期547-554,共8页

摘　　要： 在TA15-2表面进行激光同轴送粉合金化Stellite 12-B4C粉末制备耐磨复合涂层.研究表明,加入Cu可促使大量超细纳米多晶体及非晶相在涂层中产生,从而增强涂层的耐磨性.Cu对激光合金化涂层的纳米化过程,是利用Cu在激光熔池中原位化学反应生成的AlCu2Ti超细纳米晶相来抑制颗粒长大的过程,也是大量纳米多晶体生成的过程.含Cu涂层主要由gCo,M12C,M23C6,W-C,Ti-B及AlCu2Ti晶化相、大量非晶相构成.AlCu2Ti超细纳米晶在高温熔池中具有较高的扩散率,易引发晶格畸变,使涂层发生非晶化转变. Coaxial powder feeding laser alloying of the Stellite 12-B4C mixed powders on an aviation materi- al TA15-2 titanium alloy substrate can form a wear resistance composite coating. Investigation indicated that the Cu addition promoted a great quantity of the ultrafine nanoscale polycrystals and amorphous phases to be produced in such coating, leading to an improvement of wear resistance. The nanocrystallization process of Cu on laser clad coatings, i.e. and the process of the productions of the nanoscale polycrystals, and also the A1Cu2Ti ultrafine nano- crystals which were produced through in situ chemical reaction in laser molten pool retarded greatly growth of the particles. The coating with Cu mainly consisted of γ-Co, M12C, M23C6, W-C, Ti-B, A1Cu2Ti and also the amorphous phases. A1Cu2Ti ultrafine nanocrystals owned the high diffiasibility in such high temperature molten pool, causing the lattice distortions, which also played an important amorphization effect on such coating.

关 键 词： 激光合金化 表面强化 磨损性能 非晶 纳米晶

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]