Effect of Laser Bulk Energy Density on Densification Behavior of TC4 Titanium Alloy by SLM

SUN Jing; ZHU Xiaogang; LI Peng; WANG Xuqin; QIU Lianfang; WANG Fei; WANG Lianfeng; WU Wenheng; GU Zheming

doi:10.11973/jxgccl202001009

Materials and Mechanical Engineering > 2020 > 44(1): 51-56. > DOI: 10.11973/jxgccl202001009

SUN Jing, ZHU Xiaogang, LI Peng, WANG Xuqin, QIU Lianfang, WANG Fei, WANG Lianfeng, WU Wenheng, GU Zheming. Effect of Laser Bulk Energy Density on Densification Behavior of TC4 Titanium Alloy by SLM[J]. Materials and Mechanical Engineering, 2020, 44(1): 51-56. DOI: 10.11973/jxgccl202001009

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Effect of Laser Bulk Energy Density on Densification Behavior of TC4 Titanium Alloy by SLM

1. Shanghai Aerospace Equipments Manufacturer Co., Ltd., Shanghai 200245, China;
2. Shanghai 3D Printing Materials Engineering Technology Research Center, Shanghai Research Institute of Materials, Shanghai 200437, China

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Received Date: December 26, 2018
Revised Date: November 21, 2019

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Abstract

The TC4 titanium alloy was prepared by selective laser melted (SLM) technique, and the effect of laser bulk energy density on surface quality and densification behavior of the alloy was studied. The results show that when the laser bulk energy density increased from 33 J·mm^-3 to 80 J·mm^-3), the surface roughness of the alloy decreased, indicating the surface quality was improved; the surface balling effect was improved significantly. With the increase of the laser bulk energy density, the amount of voids inside the alloy decreased and the relative density increased from 90.5% to 99.3%; but excessive flow of the melt at an over high laser bulk energy density affected the dimensional accuracy and properties of the formed parts. The optimum parameter for preparing the alloy was the laser bulk energy density of laser 66 J·mm^-3, namely the laser effect of 250 W and scanning velocity of 500 mm·s^-1, and the alloy had good surface quality and densification.
- TC4 titanium alloy,
- selective laser melting,
- relative density,
- surface quality

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