1 江苏理工学院 机械工程学院, 常州 213001
2 重庆大有表面技术有限公司, 重庆 401326
为了深入了解钛合金激光再制造的发展现状, 从再制造材料以及工艺方法两方面综述了钛合金激光再制造的研究进展。阐述了金属基粉末、陶瓷材料、稀土及其氧化物粉末的再制造特点与应用, 论述了主要激光工艺参数对覆层形貌及性能的影响规律, 讨论了数值模拟、辅助工艺以及复合工艺在该类合金部件激光再制造中的应用, 最后对钛合金部件激光再制造的发展趋势进行了展望。
激光技术 激光再制造 钛合金 熔覆材料 熔覆工艺 laser technique laser remanufacturing titanium alloy cladding material cladding process
Author Affiliations
Abstract
1 Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai201800, China
2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing100049, China
This paper investigates the monolithic edge-cladding process for the elliptical disk of N31-type Nd-doped phosphate laser glass, which will be utilized under liquid cooling conditions for high-power laser systems. The thermal stress, interface bubbles and residual reflectivity, which are due to high-temperature casting and bonding during the monolithic edge-cladding process, are simulated and determined. The applied mould is optimized to a rectangular cavity mould, and the casting temperature is optimized to 1000°C. The resulting lower bubble density makes the mean residual reflectivity as low as 6.75 × 10-5, which is enough to suppress the amplified spontaneous emission generated in the Nd-glass disk, and the resulting maximum optical retardation is converged to 10.2–13.3 nm/cm, which is a favourable base for fine annealing to achieve the stress specification of less than or equal to 5 nm/cm. After fine annealing at the optimized 520°C, the maximum optical retardation is as low as 4.8 nm/cm, and the minimum transmitted wavefront peak-to-valley value is 0.222 wavelength (632.8 nm). An N31 elliptical disk with the size of 194 mm × 102 mm × 40 mm can be successfully cladded by the optimized monolithic edge-cladding process, whose edge-cladded disk with the size of 200 mm × 108 mm × 40 mm can achieve laser gain one-third higher than that of an N21-type disk of the same size.
interface bubble monolithic edge-cladding process N31-type Nd-doped phosphate laser glass residual reflectivity stress birefringence High Power Laser Science and Engineering
2022, 10(2): 02000e14
1 中国科学院 宁波材料技术与工程研究所, 宁波 315201
2 中国科学院大学 材料科学与光电技术学院, 北京 100049
为了利用高能激光束将镍、铁、铝金属单质的混合粉末快速熔融, 得到高性能的镍铁铝合金, 并直接用于熔覆, 采用激光3-D打印的金属粉末成型的方法, 用一台中低功率的光纤激光器, 以工程中常用的轧制不锈钢板为基底, 研究了一定比例的镍、铁、铝混合粉末的熔覆冶金情况。通过优化激光工艺参量(激光频率、扫描速率、激光功率和离焦量)组合, 得到了质量良好的单道熔覆结果。通过激光共聚焦显微镜、晶相显微镜以及扫描电子显微镜等检测手段, 对熔覆条的宏观形貌和微观组织进行观察。结果表明, 可获得良好的无气孔无裂纹的合金组织, 且合金与基板形成了良好的冶金结合; 熔覆层硬度低于基板硬度30HV左右, 但截面硬度分布均匀。该研究有助于得到各向性质统一的冶金层。
激光技术 镍铁铝 激光熔覆工艺 熔覆冶金 激光3-D打印 laser technique Ni-Fe-Al laser cladding process cladding metallurgy laser 3-D printing
中国科学院宁波材料技术与工程研究所, 浙江 宁波 315201
为了探索激光工艺参数对316L不锈钢粉末在304#不锈钢板上熔覆质量的影响规律，发现最优的工艺参数，利用实验室自行设计组装的光纤激光熔覆系统对其进行了一系列的激光熔覆工艺试验。用激光共聚焦显微镜、维氏硬度计以及其他方法，对不同组合的工艺参数（激光功率、熔覆速度、激光频率以及离焦量等）下单道熔覆的试样的表面形貌和横截面质量进行了检测和分析，发现了工艺参数对熔覆质量的影响规律，并据此确定了一个最佳的熔覆参数组合范围，在这个范围内得到的熔覆试样结果显示，熔覆条表面光滑，有完整的熔覆条纹，无气孔和裂纹。
激光光学 激光熔覆 316L不锈钢 熔覆工艺 熔覆宽度 工艺参数 激光与光电子学进展
2016, 53(6): 061406
