摘要
为提高航空复合材料用Invar合金模具修复再制造的质量,本文对比研究了超声频脉冲电弧和普通直流电弧对Invar合金电弧增材修复熔覆金属界面组织特征的影响。结果表明,通过引入超声频脉冲电流,可在更低的热输入量条件下获得与常规直流电弧相当的熔深。重熔填充金属主要由柱状枝晶构成,重熔母材区主要由胞状晶构成。相比直流电弧,超声频脉冲电弧作用下胞状晶柱状生长可被有效阻断,进而获得短棒状胞状晶。在直流电弧重熔金属区可观察到大量晶间微米尺度热裂纹,而超声频脉冲电弧可有效抑制热裂纹等缺陷。
In order to improve the repair and remanufacturing quality of Invar alloy mold for aviation composites, this paper studies the effects of ultrasonic-pulsed arc and ordinary direct-current arc on the interfacial microstructure evolution behavior of Invar alloy arc deposited metal. The results show that by introducing ultrasonic pulse current, the fusion penetration equivalent to that of conventional direct-current arc can be obtained under the condition of lower heat input. The remelted filler metal is mainly composed of columnar dendrites, and the remelted base metal area is mainly composed of cellular crystals. Compared with direct-current arc, ultrasonic pulse arc can block the columnar growth of cellular crystals and obtain short rod cellular crystals. A large number of intergranular micron-scale thermal cracks are observed in the remelting metal zone by direct-current arc, and the ultrasonic pulse arc can effectively suppress thermal crack defects.
作者
曾才有
于杰琳
张世伟
万晓慧
齐铂金
从保强
Zeng Caiyou;Yu Jielin;Zhang Shiwei;Wan Xiaohui;Qi Bojin;Cong Baoqiang(Beihang University,Beijing 100191,China;Aeronautical Key Laboratory for Welding and Joining Technologies,AVIC Manufacturing Technology Institute,Beijing 100024,China)
出处
《航空科学技术》
2022年第10期59-65,共7页
Aeronautical Science & Technology
基金
航空科学基金(20200011025002)。
