张高伟,韩文妥,崔丽娟,万发荣.V-4Cr-4Ti/Ti扩散连接接头的界面结构及力学性能研究[J].稀有金属材料与工程,2018,47(5):1537~1542.[Zhang Gaowei,Han Wentuo,Cui Lijuan,Wan Farong.Study on the Interface Microstructure and Bonding Strength of V-4Cr-4Ti/Ti Diffusion Bonding Joint[J].Rare Metal Materials and Engineering,2018,47(5):1537~1542.]
V-4Cr-4Ti/Ti扩散连接接头的界面结构及力学性能研究
投稿时间:2017-02-20  修订日期:2017-05-20
中文关键词:  V-4Cr-4Ti /Ti扩散连接  锻造加工  断面形貌  剪切强度
基金项目:
中文摘要:
      利用锻造加工进行了V-4Cr-4Ti/Ti两种材料的扩散连接,并通过OM,SEM,EDS,剪切实验等手段分析和研究了扩散接头的界面结构及其接合强度。微观结构分析表明,扩散接头的总宽度约为100 μm,并分为明显的Ⅰ、Ⅱ两部分:Ti基体侧的Ⅰ区较宽,由致密的针状组织组成;V-4Cr-4Ti合金一侧的Ⅱ区宽度约为Ⅰ区的一半,该区平滑无缺陷,未看到孔洞和裂纹等缺陷的存在。根据材料基体和扩散接头处的硬度分布规律,可以将它们进一步分为A-F六个区域,其中C区的硬度最高,其与钛基体交界区域的最大硬度高达332 HV,远高于基体材料的硬度(钛基体的平均硬度为190 HV,钒合金基体为258 HV),而E区的硬度较低,最低仅为182 HV。剪切实验结果表明,扩散接头的剪切强度大于165.2 MPa,且断裂发生在靠近扩散接头的钛基边界区域,这很可能是因为金属钛在冷却过程中发生相变导致局部应力集中所造成的。
Study on the Interface Microstructure and Bonding Strength of V-4Cr-4Ti/Ti Diffusion Bonding Joint
英文关键词:V-4Cr-4Ti/Ti diffusion bonding  hot forging process  fracture surface mocrostructure  shear strength
英文摘要:
      The diffusion bonding of V-4Cr-4Ti alloy and pure titanium was achieved by the hot forging process. The interface microstructure and bonding strength of the diffusion joint were analyzed by OM, SEM, EDS, and shear test, respectively. The diffusion joint is about 100 μm wide in total, and can be divided into two zones with different width and microstructure. The SEM analysis across the diffusion interface presents a smooth diffusion interface without any defects. According to the Vickers hardness distribution across the substrates and the diffusion joint, it can be divided into six regions (A, B, C, D, E and F). The boundary zone of region C close to Ti substrate possesses the highest hardness of 332 HV, and the zone of region E close to region D has the lowest hardness(182 HV), while the average hardness of Ti substrate and V-4Cr-4Ti alloy are 190 HV and 258 HV, respectively. The result of shear test shows that the actual shear strength is higher than 165.2 MPa, and the fracture occurred at the boundary zone of titanium substrate close to the diffusion joint, which is mainly ascribed to the stress concentration due to the phase trasition for Ti substrate during cooling process.
作者单位E-mail
张高伟 北京科技大学 gaoweizh508@163.com 
韩文妥 北京科技大学  
崔丽娟 瑞士保罗谢尔研究所  
万发荣 北京科技大学 wanfr@mater.ustb.edu.cn 
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