Induction of Ball-Filled Pores in Electron Beam Freeform Fabrication of Ti-6-Al-4-V Alloy by Dissolved Gas and Metallic Vapor
作者： Tao Chen , Shengyong Pang , Qun Tang , Hongbo Suo , Shuili Gong
DOI: 10.1007/S11661-015-3146-3
关键词:
摘要: A new type of pore was discovered during electron beam freeform fabrication Ti-6-Al-4-V alloy. Unlike common metallurgical pores, the has near-spherical smooth contour with a unique ball-filled microstructure. This may have originated from mixed bubbles combining metallic vapor and dissolved gas. The V, Ti, Al vapors undergo sequential condensation. first deposited V atoms provide cores for heterogeneous nucleation. nuclei grow into small balls under rapid cooling rate.
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