(1. 东北大学 轧制技术及连轧自动化国家重点实验室，沈阳 110819；
2. 首钢京唐有限公司，唐山 063200)
摘 要: 利用真空轧制复合技术900 ℃时制备TA2与304L不锈钢的复合钢板，分别研究直接复合及加入Nb夹层后复合界面的组织与性能，分析Nb夹层对复合板组织及性能的影响。结果表明：直接复合的Ti-不锈钢复合板界面生成了Fe2Ti、Cr2Ti及NiTi2等多种金属间化合物，严重削弱界面的结合强度，界面的剪切强度仅为128 MPa，性能较差。加入Nb层后，Ti与不锈钢之间的互扩散被完全阻止，且Nb夹层与两侧金属均产生良好的结合；Nb、Ti界面未生成任何金属间化合物，Nb与不锈钢界面有FeNb金属间化合物生成；界面剪切强度获得大幅提升，达到338 MPa，性能优良。
关键字: TA2钛；304L不锈钢；真空轧制复合；界面；金属间化合物；Nb夹层；剪切强度
（1. State Key Laboratory of Rolling and Automation, Northeastern University, Shengyang 110819, China;
2. Shougang Jingtang Iron and Steel Co., Ltd., Tangshan 063200, China）
Abstract:The vacuum hot-roll bonding was carried out between TA2 titanium (Ti) and 304L stainless steel (SS) at 900 ℃. The vacuum hot-rolling bonding without interlayer and with niobium (Nb) interlayer was investigated, respectively. The microstructure and property of the interfaces were in-depth studied and the effect of the Nb interlayer was analyzed. The results show that many intermetallic compounds (IMC) are formed on the direct bonded Ti-SS interface, such as Fe2Ti, Cr2Ti and NiTi2. These IMC seriously weaken the shear strength, and lower shear strength of about 128 MPa is achieved. Inserting the Nb interlayer can effectively prevent the interdiffusion between Ti and SS. No IMC is found at Ti-Nb interface while IMC of FeNb is found at Nb-SS interface. The shear strength of about 338 MPa is achieved. The property of the clad plate is substantially enhanced by inserting Nb interlayer.
Key words: TA2 titanium; 304L stainless steel; vacuum hot-roll bonding; interface; intermetallic compound; Nb interlayer; shear strength
