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利用激光熔铸对预制模拟损伤的变形铝合金试件进行修复试验,在熔铸修复区采用实时机械冲击变形的方法强化修复试件。对修复件进行疲劳寿命对比试验,分析了激光熔铸与定量变形强化相结合的复合修理方式对试件疲劳性能的影响。结果表明,由于熔铸区底层柱状枝晶和残余拉应力的存在,激光熔铸修复会降低试件的疲劳寿命;辅加变形强化以后,试件疲劳寿命大幅增加,增幅可达187%;在所选冲击力范围内,试件疲劳寿命随冲击强度增大呈减少趋势。
Laser welding was used to repair the deformed aluminum alloy precast specimens and the repaired specimens were strengthened by real-time mechanical impact deformation in the cast-in repair area. The fatigue life comparison tests of the repaired parts were carried out. The effects of the composite repairing method combined with the laser casting and the quantitative deformation strengthening on the fatigue properties of the specimens were analyzed. The results show that due to the existence of columnar dendrites and residual tensile stresses in the casting zone, laser fatigue casting can reduce the fatigue life of the specimens. After the additional strengthening, the fatigue life of the specimens increases sharply by as much as 187% Within the impact range, the fatigue life of specimens decreases with the increase of impact strength.