Deformation behaviors of as-built and hot isostatically pressed Ti-6Al-4V alloys fabricated via electron beam rapid manufacturing |
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Affiliation: | Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China;School of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230000, China;Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China;Avic Manufacturing Technology Institute, Beijing, 100024, China |
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Abstract: | The deformation behavior of as-built and hot isostatically pressed (HIP) Ti-6Al-4 V alloys fabricated using electron beam rapid manufacturing (EBRM) were investigated in this work. The deformation characteristics were characterized using a laser scanning confocal microscope and electron back-scattered diffraction (EBSD). In the as-built sample, prismatic slip was the main mode of deformation, as well as a small amount of basal slip and cross-slip. Some planar slip lines with large length scales were observed across several α lamellae. After hot isostatical pressing, prismatic and basal slip were the main mode of deformation, accompanied by abundant cross-slip and multiple slip, and most of the slip lines were blocked within an α lamellae. These differences in deformation behavior were associated with the coarsening of α laths and the more retained β phase after HIP compared to the as-built alloy. More cross-slip and multiple slip can lead to superior elongation-to-failure and a greater strain hardening effect in the HIP alloy compared to the as-built sample. |
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Keywords: | Electron beam rapid manufacturing Ti-6Al-4V Hot isostatic pressure Mechanical properties Slip behavior |
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