Effects of Spray Forming Parameters on Properties of As-deposited Billet
LU Lin1, WU Wenheng1, LONG Qianlei1, ZHANG Liang1, ZHANG Jishan2
1 Shanghai Engineering Research Center of 3D Printing Materials, Shanghai Research Institute of Materials, Shanghai 200437 2 State Key Laboratory for Advanced Metals & Materials, University of Science and Technology Beijing, Beijing 100083
Abstract: There are many parameters that affect the quality of spray forming billet. Apart from the own characteristics of the material, the process para-meters play a crucial role in determining the quality of the billet. The effects of spray forming processing parameters on properties of as-deposited billet were studied in this paper. Emphases were placed on the effects of melt superheat and gas pressure on the shape, porosity and solidification microstructures of as-deposited billet of M3 high speed steel. The results showed that there was a remarkable impact of melt superheat and gas pressure on the properties of as-deposited billet. The obviously refined solidification microstructure could be achieved whether by decreasing the melt superheat or increasing of the gas pressure. The porosity of the bottom dropped with increasing melt superheat, while the porosity in the edge, surface and center region decreased first and then increased with increasing melt superheat. On the other hand, the value of P (porosity) increased monotonically with the rise of gas pressure in the bottom, surface, and periphery zones, whereas the porosity of the central zone decreased firstly and then grew with the increase of gas pressure. A high quality as-deposited billet with the desired shape, low porosity and fine microstructure could be obtained by spray forming under the melt superheat of 160—180 ℃ and gas pressure of 0.45—0.5 MPa, respectively.
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2019, Vol. 33 
