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| MICROSTRUCTURE CHARACTERISATION OF PROTRUSIONS BY ELECTRON BEAM SURFI–SCULPT ON THE SURFACE OF TA15 Ti ALLOY |
| XU Hengdong 1,2, ZHAO Haiyan 1, MENG Lingyao 1, WANG Xichang 2, GONG Shuili 2, BAI Bingzhe 3 |
1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084
2. Beijing Aeronautical Manufacture Technology Research Institute, Beijing 100024
3. Department of Materials Science and Engineering, Tsinghua University, Beijing 100084 |
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Cite this article:
XU Hengdong ZHAO Haiyan MENG Lingyao WANG Xichang GONG Shuili BAI Bingzhe . MICROSTRUCTURE CHARACTERISATION OF PROTRUSIONS BY ELECTRON BEAM SURFI–SCULPT ON THE SURFACE OF TA15 Ti ALLOY. Acta Metall Sin, 2012, 48(8): 989-994.
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Abstract Electron beam surfi–sculpt is a novel surface processing technology, in which electron beam is controlled by magnetic field and deflected quickly over a substrate surface to displace materials in a settled manner, thus producing customized textured surface consisting of an array of protrusions above the original surface and a corresponding array of cavities in the substrate. This technology could be used in dissimilar materials connection between metals and composites, as the protrusions on metal surface would increase the interface area, which results in great improvements in both strength and absorbed energy. It could also be applied to improve the surface coating quality by tailor–making protrusions throughout a component surface so as to enhance the adhesive capacity between coating and substrate, as well as to optimize the stress distribution that occurs in coating process. The application performance of textured surface depends on the microstructure characterisation of protrusions, while the investigation on the microstructures and mechanical properties of the protrusion is lack. In this work, electron beam surfi–sculpt was carried out to produce protrusions on TA15 (Ti–6Al–2Zr–1Mo–1V) surface through multi–beam technique. The microstructure features of protrusions were investigated by OM, SEM and XRD, and the weight percentages of alloy elements were analyzed by EDS. In addition, the micro–hardness of the four zones were measured and the results were explained by its microstructure features and weight percentages of alloy elements. It was found that four zones exist in the protrusion, namely edge zone, central zone, heat affected zone (HAZ) and substrate. The edge zone is composed of coarse grain with platelet martensite inside, whose micro–hardness is the lowest. The central zone, whose micro–hardness is the second lowest, is constituted of coarse grain with regular–layed platelet martensite; however, the grain size is smaller than that in the edge zone. The HAZ is characterized of fine grain with boundary α and parallel–layed short platelet martensite inside, plus the highest micro–hardness. The weight percentages of Al in the HAZ and the substrate were higher than that in the edge zone and the central zone, which, together with different grain size of the four zones, are the two main reasons for the micro–hardness differences of the four zones.
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Received: 16 January 2012
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| Fund: Supported by National Natural Science Foundation of China (Nos.50505019, 50935008 and 50975268), New Century Excellent Talents in University (No.NCET–07–0503) and Zhejiang Provincial Scientific Research Project (No.2009C21019) |
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