Selective laser melting of titanium parts: Influence of laser process parameters on macro- and microstructures and tensile property

2019 ◽  
Vol 342 ◽  
pp. 371-379 ◽  
Author(s):  
Dongsheng Sun ◽  
Dongdong Gu ◽  
Kaijie Lin ◽  
Ji Ma ◽  
Wenhua Chen ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Tensile Property ◽  
Process Parameters ◽  
Laser Melting ◽  
Laser Process

A Study on Effect of Different Process Parameters on the Quality of Overhang Surface Produced by Selective Laser Melting

2018 ◽  
Author(s):  
Sagar Sarkar ◽  
Ankit Porwal ◽  
Nuthalapati Yaswanth ◽  
Ashish Kumar Nath
Keyword(s):  
Aspect Ratio ◽  
Selective Laser Melting ◽  
Process Parameters ◽  
Support Structures ◽  
Metal Powders ◽  
Laser Melting ◽  
Scanning Strategy ◽  
Support Structure ◽  
Laser Process

Selective Laser Melting process enables production of geometrically complex parts directly from CAD model by melting metal powders layer by layer. For successful building of parts, some auxiliary structures namely support structures are also built to ensure proper heat conduction from actual parts to be built to the base plate. Support structures are needed if there are overhang surfaces in the design of the part. If the design of the part is very complex and features many overhang surfaces, then too many supports get generated. After building the part, these support structures need to be removed properly to get desired geometrical features and it may deteriorate the surface quality from where supports are removed. Sometimes removal of support structures becomes very difficult specially for parts having internal features. In this study, first effect of inclined angle, aspect ratio and different scanning strategies on the quality of overhang surfaces produced without any support structure under constant laser power and scan speed has been investigated. Scanning Electron Microscopy (SEM) images of overhang surfaces have been analyzed to investigate the presence of warping and uneven fused edges if any. It was found that with increase in inclined angles and aspect ratio, warping and presence of uneven fused edges increases. Rotational scanning strategy found to be better than linear alternate scanning strategy for reduced uneven fused edges formation and warping. Results show an overhang without any support structure can be built successfully with a single laser process parameters upto 25.343 degree which is less than theoretical critical angle of 26.565 degree. Further, it has been shown, using a novel strategy of building overhang with multiple laser process parameters, it is possible to build overhang even upto 24.132 degree.

scholarly journals Effect of Process Parameters and High-Temperature Preheating on Residual Stress and Relative Density of Ti6Al4V Processed by Selective Laser Melting

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 930 ◽  
Author(s):  
Martin Malý ◽  
Christian Höller ◽  
Mateusz Skalon ◽  
Benjamin Meier ◽  
Daniel Koutný ◽  
...  
Keyword(s):  
Residual Stress ◽  
High Temperature ◽  
Residual Stresses ◽  
Relative Density ◽  
Selective Laser Melting ◽  
Process Parameters ◽  
Stress Reduction ◽  
Laser Melting ◽  
Preheating Temperature ◽  
Laser Velocity

The aim of this study is to observe the effect of process parameters on residual stresses and relative density of Ti6Al4V samples produced by Selective Laser Melting. The investigated parameters were hatch laser power, hatch laser velocity, border laser velocity, high-temperature preheating and time delay. Residual stresses were evaluated by the bridge curvature method and relative density by the optical method. The effect of the observed process parameters was estimated by the design of experiment and surface response methods. It was found that for an effective residual stress reduction, the high preheating temperature was the most significant parameter. High preheating temperature also increased the relative density but caused changes in the chemical composition of Ti6Al4V unmelted powder. Chemical analysis proved that after one build job with high preheating temperature, oxygen and hydrogen content exceeded the ASTM B348 limits for Grade 5 titanium.

Microstructural Evolution and Tensile Property of Hastelloy-X Alloys Produced by Selective Laser Melting

2017 ◽  
Vol 44 (2) ◽  
pp. 0202007
Author(s):  
侯慧鹏 Hou Huipeng ◽  
梁永朝 Liang Yongchao ◽  
何艳丽 He Yanli ◽  
李雅莉 Li Yali ◽  
雷力明 Lei Liming
Keyword(s):  
Selective Laser Melting ◽  
Tensile Property ◽  
Microstructural Evolution ◽  
Laser Melting ◽  
Hastelloy X

Effect of Process Parameters on the Deformation of Selective Laser Melting

2020 ◽  
Vol 57 (5) ◽  
pp. 051403
Author(s):  
吴懋亮 Wu Maoliang ◽  
孙翰霆 Sun Hanting ◽  
孙玄锴 Sun Xuankai ◽  
刘中俊 Liu Zhongjun ◽  
李汝润 Li Rurun
Keyword(s):  
Selective Laser Melting ◽  
Process Parameters ◽  
Laser Melting

Effect of selective laser melting process parameters on microstructural and mechanical properties of TiC–NiCr cermet

2020 ◽  
Vol 46 (18) ◽  
pp. 28749-28757 ◽  
Author(s):  
Atefeh Aramian ◽  
Zohreh Sadeghian ◽  
Seyed Mohammad Javad Razavi ◽  
Konda Gokuldoss Prashanth ◽  
Filippo Berto
Keyword(s):  
Mechanical Properties ◽  
Selective Laser Melting ◽  
Process Parameters ◽  
Melting Process ◽  
Laser Melting ◽  
Selective Laser Melting Process

Main Defects Observed in Titanium GRADE II and 316L Stainless Steel Elements Obtained by Selective Laser Melting

2020 ◽  
Vol 308 ◽  
pp. 33-50
Author(s):  
Anna Woźniak ◽  
Marcin Adamiak
Keyword(s):  
Stainless Steel ◽  
Energy Density ◽  
Selective Laser Melting ◽  
Process Parameters ◽  
Defect Formation ◽  
Pure Titanium ◽  
Parameters Optimization ◽  
Laser Melting ◽  
Grade Ii ◽  
Titanium Grade

Selective Laser Melting SLM is one of the most popular three dimensional printing methods, which can be used for manufactured real elements (with high geometrical complexity) in many application, such as medicine, automotive or aerospace industries. The SLM final parts are characterized by high mechanical properties and satisfactory physicochemical properties. However, the properties of parts depend of process parameters optimization. In this paper, effects of processing parameters, such as laser power P, scanning speed SP, layer thickness t or point distance PD on defect formation and relative densities of manufactured elements are explored. For the purpose the stainless steel 316L and pure titanium Grade II are used. The process optimization were carried out according to the formula of energy density, which is delivered to the powder material. The stainless steel samples were divided into 12 groups, depends of the energy density. The titanium parts were printed at the same value of energy, and the process parameters are changed. The microscope observation and relative density measurements were carried out. Based on the obtained results, it can be confuted that the SLM parameters have a significant effect on the samples properties and the mechanism formed defect in both material are similar.

An experimental study of tensile property variability in selective laser melting

2019 ◽  
Vol 43 ◽  
pp. 26-35 ◽  
Author(s):  
Shanshan Zhang ◽  
Santosh Rauniyar ◽  
Subin Shrestha ◽  
Aaron Ward ◽  
Kevin Chou
Keyword(s):  
Experimental Study ◽  
Selective Laser Melting ◽  
Tensile Property ◽  
Laser Melting
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