%0 Journal Article
%T Continuous Electron Beam Post-Treatment of EBF3-Fabricated Ti每6Al每4V Parts
%J Metals | An Open Access Journal from MDPI
%D 2019
%R https://doi.org/10.3390/met9060699
%X In the present study, the methods of optical, scanning electron, and transmission electron microscopy as well as X-ray diffraction analysis gained insights into the mechanisms of surface finish and microstructure formation of Ti每6Al每4V parts during an EBF 3-process. It was found that the slip band propagation within the outermost surface layer provided dissipation of the stored strain energy associated with martensitic transformations. The latter caused the lath fragmentation as well as precipitation of nanosized 汕 grains and an orthorhombic martensite 汐∪ phase at the secondary 汐 lath boundaries of as-built Ti每6Al每4V parts. The effect of continuous electron beam post-treatment on the surface finish, microstructure, and mechanical properties of EBF 3-fabricated Ti每6Al每4V parts was revealed. The brittle outermost surface layer of the EBF 3-fabricated samples was melted upon the treatment, resulting in the formation of equiaxial prior 汕 grains of 20 to 30 米m in size with the fragmented acicular 汐∩ phase. Electron-beam irradiation induced transformations within the 70 米m thick molten surface layer and 500 米m thick heat affected zone significantly increased the Vickers microhardness and tensile strength of the EBF 3-fabricated Ti每6Al每4V samples. View Full-Tex
%U https://www.mdpi.com/2075-4701/9/6/699