摘要
基于橡树岭国家实验室(ORNL)开发的具有良好抗蠕变性能且在材料表面形成Al_2O_3膜的奥氏体不锈钢(AFA)的化学成分,结合熔覆粉末设计原则进行熔覆粉末配比,在304不锈钢基体表面进行激光熔覆,研究激光功率、铝含量对熔覆层成型性和组织的影响。研究结果表明,激光能量密度为31.25W·s/mm^2时,熔覆层成型性良好,无开裂、气孔等缺陷。熔覆层与304不锈钢基体界面呈冶金结合;Al含量从0增加到5wt%,组织呈细化趋势;合金涂层的平均显微硬度高达230HV;铝含量2.5wt%的试样,在腐蚀试验温度90℃下,10%HCl+10%HNO_3及6%的FeCl_3溶液中进行腐蚀,基体腐蚀速率为42mm/a,涂层腐蚀速率为8.76mm/a。
Based on the chemical composition of Oak Ridge National Laboratory （ORNL） which has developed Al2O3 films with a good creep resistance and formation on the surface of austenitic stainless steel （AFA）, cladding FeNiCrAI coating on the 304 stainless steel substrate surface by laser. Design the ratio of cladding powder based on the thermal physical parameters and the principle of Wettability. Researching on the effects of laser power and aluminum content to the cladding layer forming and or- ganization. It shows that when the laser power density is 31.25W · s/mm2 ,the cladding layer has good shape, forming strongly, no cracks, holes and other defects. The cladding layer and the matrix organization can achieve a good combination. When AI contents from 0 to 5wt%, the organizations are increasingly dense. The average microhardness of alloy coating is up to 230 HV. putting the sample of 2.5wt% aluminum into the corrosion solutions at 90℃. Corrosion rate of the matrix is 42mm/a, corrosion rate of the coating is 8.76mm/a
出处
《应用激光》
CSCD
北大核心
2010年第4期304-309,共6页
Applied Laser
关键词
激光熔覆
AFA
不锈钢
腐蚀
laser cladding
AFA
stainless steel
corrosion
