CAJ | 학술논문

采用优化后的激光熔覆工艺参数,以团聚纳米晶WC颗粒为增强相,在45钢表面熔覆上一层纳米WC增强Ni基合金复合涂层。采用SEM、EDS、X-ray等技术手段,对涂层表面磨损前和磨损后的显微组织和元素含量进行了分析研究,得到以下结论：磨损表面在摩擦应力作用下,发生了明显的相变特征,其中涂层中碳化物形成元素的位错扩散发生明显,碳化物球化,同时Ni基合金出现常温蠕变现象,当磨损距离达到8000米时,涂层表面有大量纳米级碳化物脱溶析出。
채용우화후적격광용복공예삼수,이단취납미정WC과립위증강상,재45강표면용복상일층납미WC증강Ni기합금복합도층。채용SEM、EDS、X-ray등기술수단,대도층표면마손전화마손후적현미조직화원소함량진행료분석연구,득도이하결론：마손표면재마찰응력작용하,발생료명현적상변특정,기중도층중탄화물형성원소적위착확산발생명현,탄화물구화,동시Ni기합금출현상온연변현상,당마손거리체도8000미시,도층표면유대량납미급탄화물탈용석출。
The Ni matrix composite coatings were made with preferred laser cladding processing parameter on 45 steel samples,which were strengthened by agglomerated micro-grain WC particles and agglomerated nano-grain WC particles.The phase and microstructure of the coatings were measured and studied by SEM,EDS,X-ray,TEM.The conclusions were gotten： effected by friction force,on the wear surface,the dislocation diffusion of carbide elements appear intensively,and the carbide particles globalize,at the same time creep deformation on room temperature emerge in Ni matrix.When the wear distance reach 8000 meters,a large number of nano-carbide precipitate from the coating.