爆炸焊接Nb/Q345R层状复合材料的热震性能研究  

Research on Thermal Shock Performance of Nb/Q345R Laminated Composite Fabricated by Explosive Welding

作　　者：宋晓毓 王德志[1] 吴壮志[1] 段柏华[1] 毕海莲 刘新利 SONG Xiaoyu;WANG Dezhi;WU Zhuangzhi;DUAN Bohua;BI Hailian;LIU Xinli(Materials Science and Engineering,Central South University,Changsha 410083,China;School of Chemistry and Chemical Engineering,Huangshan University,Huangshan 245041,China)

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]黄山学院化学化工学院,黄山245041

出　　处：《材料导报》2021年第18期18131-18135,共5页Materials Reports

基　　金：国家重点研发计划资助(2018YFC1901700)。

摘　　要：铌作为一种难熔金属,具有熔点高、塑性好、抗酸和抗液态金属腐蚀能力强等特性,被广泛应用于电子、机械、航空航天等领域。本工作研究了爆炸焊接Nb/Q345R层状复合材料的热震性能,通过将Nb/Q345R试样在氢气中分别加热到800℃和1000℃后迅速冷却完成一次热震,研究材料在进行10次、30次、50次热震循环后,试样的界面组织形貌及其结合强度的变化,进而评价其热震性能。采用X射线衍射(XRD)、扫描电子显微镜(SEM)等表征手段分析材料成分和界面组织形貌的变化,并通过压缩剪切试验测量层状复合材料的界面结合强度。研究结果表明,在800℃热震10次时,层状材料界面处开始产生微裂纹,而在1000℃热震50次时,材料界面处裂纹沿界面扩展、延伸,导致界面结合强度显著降低,降低至材料本身结合强度的13.22%。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 1000℃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 1000℃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.

关 键 词：爆炸焊接Nb/Q345R 层状复合材料 热震性能 压缩剪切试验 界面组织与性能 

分 类 号：TB331[一般工业技术—材料科学与工程]