面向应力剥层测量的铝合金电解工艺研究
2019-07-11
作者：杜吉星1，杨吟飞1，朱金鹏1，杨巍2
单位：1南京航空航天大学；2沈阳飞机工业（集团）有限公司
摘要：X射线衍射法可以无损测量表面残余应力，但需要结合剥层法才能测量材料一定深度上的残余应力。设计了一种电化学剥层的装置，采用NaCl溶液作为电解液，可以对金属平面小区域进行材料去除，电解深度可精确控制。以铝合金材料为例，试验优选出电解加工参数电流密度为23.87A/cm2和电解液流量为1200cm3/min。通过对数据拟合曲线进行优化处理，标定了实际深度蚀除速度约为7.42μm/s。对铣削铝合金板进行表层残余应力测量，测量结果符合一般铣削铝合金残余应力分布规律。
关键词：残余应力；铝合金；X射线衍射法；剥层法；深度蚀除速度
中图分类号：TG801;TH701文献标志码：ADOI：10.3969/j.issn.1000-7008.2019.07.011
Research on Aluminum Alloy Electrolysis Process for Stress Stripping Measurement
Du Jixing，Yang Yinfei，Zhu Jinpeng，Yang Wei
Abstract:The Xray diffraction method can measure the residual stress on the surface without damage，but it is necessary to combine the stripping method to measure the residual stress at a certain depth of the material.An electrochemical stripping device is designed，by using NaCl solution as the electrolyte，the material can be removed from the small areas of the metal plane，and the electrolysis depth can be precisely controlled.Taking the aluminum alloy material as an example，the optimal current density is 23.87A/cm2 and the electrolyte flow rate is 1200cm3/min.By optimizing the fitting curve of the data，the actual speed of corrosion depth is about 7.42 μm/s.The residual stress of the milled aluminum alloy plate is measured in surface layer，and the measurement results are in accordance with the residual stress distribution law of the general milled aluminum alloy.
Keywords:residual stress；aluminum alloy；Xray diffraction measurement method；stripping method；speed of corrosion depth