A study on surface morphology and tension in laser powder bed fusion of Ti-6Al-4V
When reporting surface quality, the roughest surface is a reference for the measurements. In LPBF due to recoil pressure and scan movement, asymmetric surface is shaped, and surface roughness has different values in different measurement orientations. In this research, the influence of the laser pow...
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| Veröffentlicht in: | International journal of advanced manufacturing technology 2020-12, Vol.111 (9-10), p.2891-2909 |
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| creator | Khorasani, Mahyar Ghasemi, AmirHossein Awan, Umar Shafique Hadavi, Elahe Leary, Martin Brandt, Milan Littlefair, Guy O’Neil, William Gibson, Ian |
| description | When reporting surface quality, the roughest surface is a reference for the measurements. In LPBF due to recoil pressure and scan movement, asymmetric surface is shaped, and surface roughness has different values in different measurement orientations. In this research, the influence of the laser powder bed fusion (LPBF) process parameters on surface tension and roughness of Ti-6AI-4 V parts in three orientations are investigated. To improve the mechanical properties, heat treatment was carried out and added to the designed matrix to generate a comprehensive data set. Taguchi design of experiment was employed to print 25 samples with five process parameters and post-processing. The effect and interaction of the parameters on the formation of surface profile comprising tension, morphology and roughness in various directions have been analysed. The main contribution of this paper is developing a model to approximate the melting pool temperature and surface tension based on the process parameters. Other contributions are an analysis of process parameters to determine the formation and variation of surface tension and roughness and explain the governing mechanisms through rheological phenomena. Results showed that the main driving factors in the variation of surface tension and formation of the surface profile are thermophysical properties of the feedstock, rheology and the temperature of the melting pool. Also, the results showed that while the value of surface tension is the same for each test case, morphology and the value of roughness are different when analysing the surface in perpendicular, parallel and angled directions to laser movement. |
| doi_str_mv | 10.1007/s00170-020-06221-w |
| format | Article |
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In LPBF due to recoil pressure and scan movement, asymmetric surface is shaped, and surface roughness has different values in different measurement orientations. In this research, the influence of the laser powder bed fusion (LPBF) process parameters on surface tension and roughness of Ti-6AI-4 V parts in three orientations are investigated. To improve the mechanical properties, heat treatment was carried out and added to the designed matrix to generate a comprehensive data set. Taguchi design of experiment was employed to print 25 samples with five process parameters and post-processing. The effect and interaction of the parameters on the formation of surface profile comprising tension, morphology and roughness in various directions have been analysed. The main contribution of this paper is developing a model to approximate the melting pool temperature and surface tension based on the process parameters. Other contributions are an analysis of process parameters to determine the formation and variation of surface tension and roughness and explain the governing mechanisms through rheological phenomena. Results showed that the main driving factors in the variation of surface tension and formation of the surface profile are thermophysical properties of the feedstock, rheology and the temperature of the melting pool. Also, the results showed that while the value of surface tension is the same for each test case, morphology and the value of roughness are different when analysing the surface in perpendicular, parallel and angled directions to laser movement.</description><identifier>ISSN: 0268-3768</identifier><identifier>EISSN: 1433-3015</identifier><identifier>DOI: 10.1007/s00170-020-06221-w</identifier><language>eng</language><publisher>London: Springer London</publisher><subject>CAE) and Design ; Computer-Aided Engineering (CAD ; Design of experiments ; Engineering ; Heat treatment ; Industrial and Production Engineering ; Interaction parameters ; Lasers ; Mechanical Engineering ; Mechanical properties ; Media Management ; Melting ; Morphology ; Original Article ; Post-processing ; Powder beds ; Process parameters ; Rapid prototyping ; Recoil ; Rheological properties ; Rheology ; Surface properties ; Surface roughness ; Surface tension ; Taguchi methods ; Thermophysical properties ; Titanium base alloys</subject><ispartof>International journal of advanced manufacturing technology, 2020-12, Vol.111 (9-10), p.2891-2909</ispartof><rights>The Author(s) 2020</rights><rights>The Author(s) 2020. 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In LPBF due to recoil pressure and scan movement, asymmetric surface is shaped, and surface roughness has different values in different measurement orientations. In this research, the influence of the laser powder bed fusion (LPBF) process parameters on surface tension and roughness of Ti-6AI-4 V parts in three orientations are investigated. To improve the mechanical properties, heat treatment was carried out and added to the designed matrix to generate a comprehensive data set. Taguchi design of experiment was employed to print 25 samples with five process parameters and post-processing. The effect and interaction of the parameters on the formation of surface profile comprising tension, morphology and roughness in various directions have been analysed. The main contribution of this paper is developing a model to approximate the melting pool temperature and surface tension based on the process parameters. Other contributions are an analysis of process parameters to determine the formation and variation of surface tension and roughness and explain the governing mechanisms through rheological phenomena. Results showed that the main driving factors in the variation of surface tension and formation of the surface profile are thermophysical properties of the feedstock, rheology and the temperature of the melting pool. 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| subjects | CAE) and Design Computer-Aided Engineering (CAD Design of experiments Engineering Heat treatment Industrial and Production Engineering Interaction parameters Lasers Mechanical Engineering Mechanical properties Media Management Melting Morphology Original Article Post-processing Powder beds Process parameters Rapid prototyping Recoil Rheological properties Rheology Surface properties Surface roughness Surface tension Taguchi methods Thermophysical properties Titanium base alloys |
| title | A study on surface morphology and tension in laser powder bed fusion of Ti-6Al-4V |
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