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张伟,祁泽武,彭鹏,许海鹰,齐铂金.电子束偏转扫描对TC18钛合金组织、硬度和作用深度的影响[J].稀有金属材料与工程(英文),2017,46(12):3651~3657.[Zhang Wei,Qi Zewu,Peng Peng,Xu Haiying and Qi Bojin.Effects of Deflection Scanning of Electron Beam on Microstructure, Hardness and Treated Depth of TC18 Titanium Alloy[J].Rare Metal Materials and Engineering,2017,46(12):3651~3657.]
Effects of Deflection Scanning of Electron Beam on Microstructure, Hardness and Treated Depth of TC18 Titanium Alloy
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Received:January 14, 2016  Revised:May 30, 2016
DOI:
Key words: deflection scanning of electron beam  surface hardening  acicular martensite  hardness
Foundation item:航空科学基金项目(2014ZE51057)
Author NameAffiliation
Zhang Wei,Qi Zewu,Peng Peng,Xu Haiying and Qi Bojin  
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Abstract:
      In this study, the high frequency deflection scanning of vacuum electron beam technology (DSEB) with line by line scanning mode and no overlap was employed to treat with the surface of TC18 titanium alloy, for obtaining a homogeneous hardened surface layer. The purpose of this work was to investigate the effects of critical process parameters, including beam current, focus current and treatment times, on the microstructure, hardness and treated depth of the treatment area. The treated specimens were characterized by using SEM, Optical Microscope, and Vickers hardness tester. After treated by DSEB, the hardened surface layer is formed, which is mainly consisted of the acicular martensite, and the surface hardness of the treatment area is improved. Moreover, the microstructure of the hardened zone is homogeneous and has no obvious transition at the contact parts of two adjacent electron beams scanning. The depth of the hardened zone can be more than 200 μm and basically constant. These results show that DSEB is a very promising technological solution for the surface heat treatment of titanium alloy of large area and complex components.