%0 Journal Article
%T The Martensitic Transformation and Mechanical Properties of Ti6Al4V Prepared via Selective Laser Melting
%J Materials | An Open Access Journal from MDPI
%D 2019
%R https://doi.org/10.3390/ma12020321
%X This article investigated the microstructure of Ti6Al4V that was fabricated via selective laser melting; specifically, the mechanism of martensitic transformation and relationship among parent ¦Â phase, martensite (¦Á¡¯) and newly generated ¦Â phase that formed in the present experiments were elucidated. The primary X-ray diffraction (XRD), transmission electron microscopy (TEM) and tensile test were combined to discuss the relationship between ¦Á¡¯, ¦Â phase and mechanical properties. The average width of each coarse ¦Â columnar grain is 80¨C160 ¦Ìm, which is in agreement with the width of a laser scanning track. The result revealed a further relationship between ¦Â columnar grain and laser scanning track. Additionally, the high dislocation density, stacking faults and the typical ( 10 1 ¡¥ 1 ) twinning were identified in the as-built sample. The twinning was filled with many dislocation lines that exhibited apparent slip systems of climbing and cross-slip. Moreover, the ¦Á + ¦Â phase with fine dislocation lines and residual twinning were observed in the stress relieving sample. Furthermore, both as-built and stress-relieved samples had a better homogeneous density and finer grains in the center area than in the edge area, displaying good mechanical properties by Feature-Scan. The ¦Á¡¯ phase resulted in the improvement of tensile strength and hardness and decrease of plasticity, while the newly generated ¦Â phase resulted in a decrease of strength and enhancement of plasticity. The poor plasticity was ascribed to the different print mode, remained support structures and large thermal stresses. View Full-Tex
%U https://www.mdpi.com/1996-1944/12/2/321