摘要
采用高能喷丸(HESP)对TA17钛合金与0Cr18Ni9Ti不锈钢棒材端面表面进行自纳米化(SSNC)处理;采用镍箔作为中间层,在不同温度(800~875℃)下对处理后的钛合金/不锈钢进行脉冲加压扩散连接(PPDB)。对接头剖面组织进行金相观察;在拉伸试验机上测试接头拉伸强度,对断面进行SEM,EDS和XRD结构物相分析。研究结果表明:在850℃时接头拉伸强度达到最高,为322.8MPa;连接后接头界面处纳米晶粒没有完全长大,存在细晶粒区;镍箔有效地阻止了Fe-Ti脆性金属间化合物的形成,在接头处形成β-Ti,(Fe,Ni)固溶体和Ti-Ni金属间化合物(Ti2Ni,TiNi,TiNi3);断裂发生在Ni层与Ti-Ni金属间化合物界面处。
A TA17 titanium alloy and 0Crl8Ni9Ti austenitic stainless steel, surface self-nanocrystallized (SSNC) by high-energy shot peening (HESP) were joined through pulse-pressure diffusion bonding (PPDB) using a pure nickel foil at 800-875℃. Additionally, the longitudinal section microstructures of joints were studied by using optical microscope. The joint strength was tested with a tensile machine. Tensile fracture was analyzed by scanning electron microscope (SEM), energy dispersive spectroscope (EDS), X-ray diffraction (XRD). The results show that the highest recorded tensile strength is equal to 322.8 MPa and is displayed at 850 ℃. The nanometer-grains across the joint did not grow up completely. Diffusion and migration between Ti and Fe atom is effectively prevented by adding pure Ni as the interlayer metal, and thus a sound joint is obtained. The interface reaction products are identified as β-Ti, (Fe,Ni) solid solution and Ni-Ti intermetallic compounds (TizNi, TiNi, TiNi3). The specimens fracture along the reaction layer of Ti-Ni intermetallics and Ni layer.
出处
《中南大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2012年第3期864-869,共6页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(50675234)
重庆市应用基础研究研究资助项目(7942)
关键词
脉冲加压扩散连接
中间层
纳米化
钛合金/不锈钢
pulse pressure diffusion bonding
interlayer
nanocrystallized
titanium alloy/stainless steel