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| Effects of laser parameters and scanning strategy on the forming properties of selective laser melting TC11 alloy |
| XIE Yan-jun1,2，YANG Huai-chao2，WANG Xue-bing2，KUANG Chun-jiang1,2，HAN Wei1 |
（1. China Iron & Steel Research Institute， Beijing 100081， China
2. Advanced Technology & Materials Co.， Ltd.， Beijing 100081， China） |
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Abstract TC11 alloy samples were prepared by selective laser melting technology. The influence of laser parameters and laser scanning strategy on the forming properties of TC11 alloy was investigated. The results indicate that， with the increase of laser scanning speed， the metal spherical particles adhering to the alloy surface increase， the width of single scanning molten pool decrease， and the surface of the sample becomes much coarser. There are spherical pores exist in the sample when the laser scanning speed is 0.6 m/s， while there are irregular pores exist in the sample when the laser scanning speed is greater than 1.2 m/s. With the increase of laser power， the width of single scanning molten pool increase and the surface of the samples become much smoother. There are little small irregular pores inside the sample when the laser power is not higher than 280 W， while there are little small spherical pores inside the sample when the laser power is 320 W. The scanning strategy of each layer is rotated 67 degrees relative to the previous layer makes up for the height difference between the center and edge caused by the previous scanning layer， avoiding the height difference increase， thus avoiding the internal porosity. The research provides a basis for selecting appropriate laser parameters and scanning strategy for preparing TC11 alloy by selective laser melting.
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Received: 23 October 2017
Published: 18 April 2018
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2018, Vol. 28 
