摘要
以铁基合金粉和铝粉为原料,采用激光熔覆反应合成工艺在低碳钢基体表面制备Fe-Al合金覆层。利用扫描电镜、能谱仪、透射电镜以及X射线衍射实验方法等对熔覆合金层以及与钢基体的结合界面等进行了显微组织与相结构的分析。结果表明:采用激光熔覆反应合成Fe-Al合金工艺在1.5～2.1kW的熔覆功率范围内获得了与基体之间良好冶金结合的Fe-Al合金覆层,覆层组织致密,含少量孤立微孔隙,但无裂纹缺陷;Fe-Al覆层组织主要为细密、均匀的树枝晶,树枝主晶是固溶有一定量Cr、Ni、Si,化学成分满足Fe_3Al中Fe与Al原子配比范围的α-Fe固溶体,其中各元素的原子比Fe:Al:Ni:Cr:Si大约为55:24:8:8:5。
Fe-Al Intermetallic coats are prepared on steel substrate by Laser cladding synthesize with mixed powders of Fe-based alloy and Al. The microstructure and phase constitution of the coat and the boundary between coat and substrate are studied with methods of SEM,EDX,TEM and XRD. The results show compact coats jointed metallurgically with the steel are obtained on 1.5~2.1kW powers,a few pores but no cracks found in the claddings. The Cladding microstructure is mainly consists of uniformity and fine dendrites of α-Fe solid solution phase,with the dendrites atom ratio of Fe：Al：Ni：Cr：Si is about 55：24：8：8：5,which is match the atom ratio of Fe and Al in Fe3Al.
出处
《应用激光》
CSCD
北大核心
2010年第1期32-36,共5页
Applied Laser
基金
安徽省自然科学基金资助项目(项目编号:070414159)
