论文部分内容阅读
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 austenitic stainless steel (AFA) with good creep resistance and the formation of Al 2 O 3 film on the surface of the material developed by Oak Ridge National Laboratory (ORNL), the blending ratio of the cladding powder 304 stainless steel substrate surface laser cladding, laser power, aluminum content of the cladding layer forming and the impact of the organization. The results show that when the laser energy density is 31.25W · s / mm ~ 2, the cladding layer has good formability and no defects such as cracking and porosity. The interface between the cladding layer and the 304 stainless steel substrate is metallurgically bonded; the content of Al is increased from 0 to 5wt%, the microstructure is refined; the average microhardness of the alloy coating is as high as 230HV; the sample with 2.5wt% The corrosion rate was 42mm / a and the corrosion rate of coating was 8.76mm / a under the condition of 90 ℃, 10% HCl + 10% HNO3 and 6% FeCl3 solution.