摘要
采用CO2激光器在45钢基体表面熔覆稀土氧化物La2O3的Fe基涂层;借助于扫描电镜(SEM)、X射线衍射仪(XRD)、能谱仪(EDS)、显微硬度计、ML-100型磨粒磨损试验机对涂层组织结构、物相、组成成分、硬度及耐磨性能进行了分析。结果表明,添加稀土能够减少甚至消除Fe基合金涂层中存在的孔洞,细化晶粒,提高致密性;涂层的硬度和磨损形貌表明,添加稀土能够小幅度地提高涂层的硬度,但能够使涂层表面的硬度值比较均匀一致,从而引起磨损表面的相对光滑。Fe基合金涂层的磨损机理为轻微的磨粒磨损,45钢的磨损机理为磨粒磨损与粘着磨损。
Fe-based coatings contained rare-earth oxide La2O3 was prepared on 45 steel by laser cladding with CO2 laser. Microstructure, phases, composition, microhardnesss and wear resistance of the coatings were analyzed by means of scanning electron microscopy （SEM） , X-ray diffraction （XRD）, energy dispersive spectrometer （EI）S） analysis, microhardness and wear tests. The results show that the addition of rare-earth can reduce or even eliminate the microholes of the coatings, improve compactness. The microhardness test and the observation of worn surface of the coatings indicate that the addition of the rare-earth slightly influences hardness of the coatings but improves the uniformity of its hardness and wear-resistance. The wear mechanism of Fe-based alloy coatings exhibits mild abrasive wear and that of 45 steel substrate is a combination of abrasive wear and adhesive wear.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第3期145-149,共5页
Transactions of Materials and Heat Treatment
基金
江西省自然科学基金项目(2010GQC0117)
国家自然科学基金项目(51001056)
2010年九江学院大学生自主创新实验项目(10XSCXXSY53)
关键词
激光熔覆
稀土氧化物
铁基合金
显微硬度
耐磨性能
laser cladding
rare-earth oxide
Fe-based alloy
microhardness
wear-resistance
