摘要
为解决铝锂合金焊后性能弱化问题,推进双激光束双侧同步焊接工艺在国产民用飞机壁板制造中的应用,研究了焊后喷丸、固溶时效热处理+喷丸处理两种共3组焊后强化工艺,通过静力拉伸、疲劳及表面应力状态测试分析,评估强化效果,探讨强化机制。结果显示:纯喷丸强化可显著提高疲劳性能,其中0.20mmN喷丸后细节额定疲劳强度截止值DFRcutoff较焊态提高27.8%,但静力拉伸性能与焊态相差不大;0.36mmN喷丸后DFRcutoff提高了118.5%,但抗拉性能明显下降;热处理+喷丸的组合强化工艺对静力拉伸及疲劳性能均有明显提升,抗拉强度较焊态提高32%,DFRcutoff较焊态提高21.9%,综合性能较好。
In order to solve the problem of weakening of Al–Li alloy after laser beam welding(LBW)which is applied to a type of civil aircraft fuselage panel,three post–processing methods which were shot peening and heat– treatment+peening were studied.The tensile test,fatigue test and residual stress test were carried out to evaluate and reveal the strengthened effect and mechanism.The results show that fatigue performance is improved significantly but tensile property is reversed.The DFRcutoff values of 0.20mmN and 0.36mmN shot peening are increased by 27.8%and 118.5%compared to original welding state.Better overall performance is presented by heat–treatment of solution and aging+shot penning,which the tensile strength is increased by 32%and the DFR value is increased by 21.9%compared to initial state.
作者
张增焕
李昊
孙小峰
曹安
ZHANG Zenghuan;LI Hao;SUN Xiaofeng;CAO An(Shanghai Aircraft Manufacturing Co.,Ltd.,Shanghai 201325,China)
出处
《航空制造技术》
2019年第12期36-41,共6页
Aeronautical Manufacturing Technology
关键词
激光焊接
铝锂合金
喷丸强化
热处理+喷丸
疲劳性能
Laser welding
Al–Li Alloy
Shot peening
Heat–treatment+peening
Fatigue performance
