Research on Thermal Shock Performance of Nb/Q345R Laminated Composite Fabricated by Explosive Welding
SONG Xiaoyu1, WANG Dezhi1, WU Zhuangzhi1, DUAN Bohua1, BI Hailian2, LIU Xinli1
1 Materials Science and Engineering, Central South University, Changsha 410083, China 2 School of Chemistry and Chemical Engineering, Huangshan University, Huangshan 245041, China
Abstract: As a refractory metal, niobium has the characteristics of high melting point, good plasticity, strong acid resistance and liquid metal corrosion resistance, and is widely used in electronics, machinery, aerospace and other fields. This paper studies the thermal shock performance of the Nb/Q345R laminated composite fabricated by explosive welding material. The Nb/Q345R sample is heated to 800 ℃ and 1 000 ℃ in hydrogen and then rapidly cooled to complete a thermal shock. After 10, 30, 50 thermal shock cycles, the interface structure and bonding strength of the sample changed, and then the thermal shock performance was evaluated. X-ray diffraction (XRD), scanning electron microscopy (SEM) and other characterization methods are used to analyze the changes in material composition and interface structure morphology, and the interfacial bonding strength of layered composites is measured through compression shear tests. The research results show that at 800°C for 10 thermal shock cycles, microcracks begin to occur at the interface of the layered material, and at 1 000 ℃ for 50 cycles, the cracks at the material interface expand and extend along the interface, resulting in a significant reduction in the interface bonding strength. Reduced to 13.22% of the bonding strength of the material itself.
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2021, Vol. 35 
