Mechanical properties of brazed ultra-thin GH99 honeycomb sandwich structure
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摘要: 以制造轻量化超薄金属热防护结构为目标，首先采用真空钎焊方式制备了GH99超薄夹层结构；通过光学显微镜及扫描电子显微镜对夹层结构的钎焊界面及母材的微观组织进行了表征；通过万能试验机对夹层结构的界面剥离强度、面内与面外压缩性能进行了测试，并与有限元模拟结果进行对比.结果表明，钎焊前后母材晶粒由退火态孪晶组织转变为等轴组织；钎焊接头主要为Ni(s, s)和Ni3Si的共晶组织，并伴随部分Cr(Mo, Ni)固溶体、Ni2Si及NiSi2相；界面剥离在薄壁面板上失效；夹层结构面内与面外的压缩失效均表现为屈曲失效，模拟结果与试验结果一致.Abstract: In this study, aiming at the fabrication of lightweight ultra-thin metal thermal protection structures, an ultra-thin sandwich structure was fabricated by vacuum brazing. The brazing interface of the sandwich structure and the microstructure of the base metal were characterized by optical microscope and scanning electron microscope. The interfacial peel strength and in-plane/out-plane compression properties of the sandwich structure were tested by a universal testing machine and compared with the finite element simulation results. The results showed that the grains of base metal transform from annealed twin structure to equiaxed structure before and after brazing. The brazing interface is mainly composed of the eutectic structure of Ni(s, s) and Ni3Si, accompanied by a certain Cr(Mo, Ni) solid solution, Ni2Si and NiSi2 phases. The interfacial delamination failure occurred on the thin-walled panel. Both the in-plane and out-of-plane compression failures of the sandwich structure were buckling failures, and the simulation results were consistent with the experimental results.
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图 1 GH99超薄夹层结构的制造流程
Figure 1. Manufacturing process of GH99 ultra-thin sandwich structure
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图 3 钎焊前后蜂窝母材的金相组织形貌
Figure 3. Metallographic state of honeycomb base metal before and after brazing. (a) before brazing; (b) after brazing
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图 4 超薄夹层结构典型钎焊接头界面微观组织及图4b中主要元素面扫描结果(1 170 ℃/10 min)
Figure 4. Metallographic structures of brazing joint. (a) the brazing seam + base metal; (b) the brazing seam; (c) the base metal; Surface scans of elements in a brazed joint with a sandwich structure( Fig. 4b) (d)Cr; (e)Ni; (f)Mo; (g)Co; (h)Si (i) all
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图 5 圆形和矩形蜂窝夹层结构实物及其复合材料超声C−扫描检验结果
Figure 5. The round and rectangular honeycomb sandwich structure in kind and its composite material ultrasonic C-scan inspection results. (a) the round noneycomb sandwich; (b) the rectangular honeycomb sandwich structure
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图 6 GH99超薄夹层结构在不同加载条件下力学性能曲线及其失效结果
Figure 6. Load-displacement curves and failure results of ultra-thin sandwich structures under different loads. (a) force-displacement curves for interfacial tearing; (b)force displacement curve for out-of-plane compression; (c) in-plane compression of sandwich structures; (d) damage state of sandwich structures under interfacial tearing; (e) out-of-plane compression; (f) in-plane compression
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图 7 超薄夹层结构面外压缩屈曲过程有限元模拟
Figure 7. Finite element simulation of out-of-plane compression buckling process of ultra-thin sandwich structure
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图 8 超薄夹层结构面内压缩屈曲过程有限元模拟
Figure 8. Finite element simulation of in-plane compression buckling process of ultra-thin sandwich structure
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