Numerical simulation of effects of scanning path on electron beam selective melting process of Ti-6Al-4V

作者：Qi, Haibo^*; Yang, Minghui; Qi, Fangjuan

来源：Transactions of the China Welding Institution, 2009, 30(8): 5-8.

• Actual conditions
• Electron beam selective melting
• Finite element modes
• Loading sequence
• Positive temperature gradient
• Rectangular parts
• Scanning path
• Tensile specimens

Aimed at the influence of temperature distribution on forming parts caused by scanning paths of filling line of electron beam selective melting technology, finite element mode with actual conditions was established and elements belonging to the rotated part were arranged in accordance with the loading sequence. Simulation results show that comparing with long-side scanning, short-side scanning and sub-area scanning, the rotated scanning of rectangular part can greatly decrease temperature gradient in the begin point and the end point of the first scanning line, especially there is a positive temperature gradient in the end point which can avoid the temperature decreasing of the molten metal. Combining rotated scanning with reversing scanning, the uniformity degree of temperature in rectangular part has greatly improved and the curl distortion caused by thermal stress has also decreased. The horizontal tensile strength of the Ti-6Al-4V tensile specimens prepared by the above optimized scanning method is 1080 MPa.

• 出版日期2009
• 单位清华大学