Abstract
This article investigated the microstructure of Ti6Al4V that was fabricated via selective laser melting; specifically, the mechanism of martensitic transformation and relationship among parent β phase, martensite (α’) and newly generated β 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 α’, β phase and mechanical properties. The average width of each coarse β columnar grain is 80–160 μm, which is in agreement with the width of a laser scanning track. The result revealed a further relationship between β columnar grain and laser scanning track. Additionally, the high dislocation density, stacking faults and the typical () 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 α + β 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 α’ phase resulted in the improvement of tensile strength and hardness and decrease of plasticity, while the newly generated β 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.
Highlights
As opposed to traditional subtractive manufacturing, selective laser melting (SLM) is a layer-by-layer overlapping technology that was used to create three-dimensional (3D) components from 3D model data by using laser as the input heat source
This study focused on the martensite that is that is generated from by by SLM, whichfrom is distinct from the traditional subtractive generated from Ti6Al4V
X-ray diffraction (XRD) Analysis the Analysis beginning of the SLM process, the dual-phase structure at the room temperature transforms
Summary
As opposed to traditional subtractive manufacturing, selective laser melting (SLM) is a layer-by-layer overlapping technology that was used to create three-dimensional (3D) components from 3D model data by using laser as the input heat source. Inresistance addition, conventional for its high melting point, frangibility large deformation the low and poor plasticity of that were fabricated by SLM the are low not and poorsurface cuttingroughness ability. Those characteristics lead to highalloys production costs [8]. Ideal; these have caused the property of SLM parts to be of lower quality when compared to surface roughness and poor plasticity of Ti6Al4V alloys that were fabricated by SLM are not ideal; traditional manufactured parts. The effect of six different sample quality and the process parameters as laser power, exposure time, point distance, particle size, kinds thickness of scan patterns on microstructure and mechanical properties has investigated. The commercial SLM printer commercial was used to build samples was used to SLM buildprinter samples with different print mode.with different print mode
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