| YUAN Mei-xia,KOU Ting-yu,LIU Qi,HUA Ming.Effect of Process Parameters on Forming Quality of Pulsed Laser SLM Titanium Alloy[J],52(11):430-438 |
| Effect of Process Parameters on Forming Quality of Pulsed Laser SLM Titanium Alloy |
| Received:October 18, 2022 Revised:February 21, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.11.037 |
| KeyWord:process parameters SLM titanium alloy surface quality density edge bulge |
| Author | Institution |
| YUAN Mei-xia |
School of Mechanical-electronic and Vehicle Engineering, Beijing University of Civil Engineering and Architecture, Beijing , China |
| KOU Ting-yu |
School of Mechanical-electronic and Vehicle Engineering, Beijing University of Civil Engineering and Architecture, Beijing , China |
| LIU Qi |
School of Mechanical-electronic and Vehicle Engineering, Beijing University of Civil Engineering and Architecture, Beijing , China |
| HUA Ming |
School of Mechanical-electronic and Vehicle Engineering, Beijing University of Civil Engineering and Architecture, Beijing , China |
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| Abstract: |
| At present, the SLM process forming test piece still has the disadvantages of poor surface quality, obvious edge bulge, and internal porosity, so the test piece can not be directly applied to the scenarios with high accuracy requirements. In this test, 15 groups of test pieces were formed by adjusting the line spacing, exposure time and point spacing of SLM forming process. The Kearns VK-X250K shape measurement laser microscope system was used to obtain the data of the surface roughness, surface morphology, and the average height difference between the edge plane and the middle plane of the test piece. At the same time, the density of the test piece was tested by Archimedes drainage method. The effect law of line spacing, point spacing and exposure time on the surface quality and density of the test piece was found, and the reason for the edge bulge of the test piece was elucidated. By quantifying the phenomenon of the edge bulge of the test piece with the optical microscope system, the effect law of the process parameters on the edge bulge of the test piece was found. It was found that with the increase of the line spacing, the surface quality and compactness of the test piece firstly increased and then decreased. The average height difference between the edge plane and the middle plane of the test piece increased firstly and then decreased. When the exposure conditions were properly increased, the surface quality and compactness of the test piece tended to decline, while the average height difference between the edge plane and the middle plane of the test piece decreased to a certain extent. When the line spacing, exposure time and point spacing were 0.1 mm, 60 μs and 30 μm respectively, the minimum surface roughness of the test piece was 2.563 μm, and the maximum density was 97.03%. When the line spacing, exposure time and point spacing were 0.15 mm, 80 μs and 40 μm respectively, the average height difference between the edge plane and the middle plane of the test piece was at least 69.865 μm. The difference of surface roughness at each position of the test piece can be found more intuitively by measuring the line roughness of the test piece through the microscopic system. The roughness of five sampling lines at different positions is measured to take the average value and calculate the standard deviation. It is found that the surface roughness of each position of the test piece is relatively uniform under low exposure intensity. Proper adjustment of the line spacing is conducive to obtaining the test piece with good surface quality and compactness and less surface defects. Moreover, the surface roughness and density of SLM forming titanium alloy test pieces show correlation to some extent. Although the high exposure condition will reduce the surface quality of the test piece, it also improves the edge bulge of the test piece. Only the combination of process parameters can not maximize the improvement of the forming quality of the test piece. Next, research will be conducted on the post-processing and remelting direction to improve the forming quality. |
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