镍基高温合金光束耦合纳秒激光铣削表面成型质量研究  

Formed Quality of Milled Surfaces of Nickel⁃Based Superalloy by Beam⁃Coupled Nanosecond Laser

作　　者：陈先游 陈晓晓 章玄华 张文武[2,3] Chen Xianyou;Chen Xiaoxiao;Zhang Xuanhua;Zhang Wenwu(Faculty of Mechanical Engineering and Mechanics,Ningbo University,Ningbo 315211,Zhejiang,China;Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Zhejiang Provincial Key Laboratory of Aero Engine Extreme Manufacturing Technology,Ningbo 315201,Zhejiang,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Mechanical and Electrical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)

机构地区：[1]宁波大学机械工程与力学学院,浙江宁波315211 [2]中国科学院宁波材料技术与工程研究所,浙江省航空发动机极端制造技术研究重点实验室,浙江宁波315201 [3]中国科学院大学,北京100049 [4]江西理工大学机电工程学院,江西赣州341000

出　　处：《中国激光》2023年第8期90-100,共11页Chinese Journal of Lasers

基　　金：浙江省自然科学基金(LY20E050004);浙江省重点研发计划(2020C01036);宁波市“科技创新2025”重大专项(2019B10074)。

摘　　要：激光铣削具有材料适应性广、激光能量密度可调控以及无机械力等特点,可用于难加工材料镍基高温合金的材料去除加工。本团队采用光束整形的多激光束耦合纳秒激光开展了DZ411镍基高温合金微铣削表面的工艺研究,分析了扫描次数N、扫描速度v、扫描间距s、脉冲频率f以及激光功率P等工艺参数对铣削表面形貌、表面粗糙度、铣削效率以及表面元素分布等的影响机制。结果表明:多光束耦合激光对材料的去除机制主要是汽化与重熔,在加工表面形成了凸起与凹坑等周期性多尺度特征;当N=10、v=100 mm/s、s=25μm、P=15 W、f=10 kHz时,面槽底部的粗糙度R_(a)最大(51.75μm),铣削效率也达到最大值(1.87 mm^(3)/min);随着扫描间距s由15μm增大到35μm或激光功率P由5 W增大到15 W,铣削效率逐渐增大;激光铣削过程中材料发生了复杂的物理化学变化,加工表面的凸起结构中可能包含多种金属氧化物和金属间化合物。本研究工作可以拓展激光加工的工艺类型,为新型激光铣削参数优化提供工艺支撑。Objective Laser milling has the advantageous characteristics of wide material adaptability,adjustable laser energy density,and no mechanical force,which make it suitable for the material removal processing of difficult-to-machine materials such as Ni-based superalloys.In order to expand the process system of laser processing and explore the material removal mechanism of novel laser milling methods to process nickel-based superalloys,the multi-beam coupled nanosecond laser milling of the DZ411 nickel-based superalloy was investigated in this work.The influence mechanisms of laser processing parameters on the surface quality and processing efficiency were analyzed,the results of which can provide technical support for the optimization of laser milling parameters.Methods The material used in this paper was the DZ411 nickel base superalloy.First,the laser milling of the Ni-based superalloy was carried out with the nanosecond pulse laser under different laser process parameters.Then,the surface morphologies of the machined nickel-based superalloy groove were observed using laser scanning confocal microscope(LSCM)and scanning electron microscopy(SEM),and the element distributions on the sample surface before and after laser milling were analyzed by EDS.Finally,the influence mechanisms of process parameters such as pulse frequency,scanning speed,scanning pitch,laser power,and scanning times on the milled surface morphology,surface roughness,milling efficiency,and element distribution were analyzed.Results and Discussions The surface roughness of the material after laser milling increased with scanning times,and the trend became slower;the laser milling efficiency tended to firstly increase,then decrease,and then slightly increase again with scanning times.The highest milling efficiency was achieved at the scanning times of 10(Figure 3).As the number of scanning times increased,the size of the bumps and pits at the bottom of the face grooves increased and the shape gradually became irregular(Figures 4 and 5).The surface

关 键 词：激光技术 激光铣削 光束耦合 镍基高温合金 表面形貌 表面粗糙度 铣削效率 

分 类 号：TN249[电子电信—物理电子学]