Numerical simulation of thermal-mechanical process of Al-Si-Pb alloy treated by high current pulsed electron beam
(1.Key Laboratory of Automobile Materials, Ministry of Education, Jilin University, Changchun 130025, China
2.吉林省长春市吉林大学汽车材料系材料科学与工程系重点实验室)
2.吉林省长春市吉林大学汽车材料系材料科学与工程系重点实验室)
Abstract: The modified microstructure of Al-Si-Pb alloys irradiated by high current electron beam (HCPEB) reveals three distinct regions: a molten zone, an overlapped zone of heat-affected and quasistatic thermal stress-affected zone, and a transition zone followed by the substrate. The hardness and wear properties of the alloys were significantly improved. To better understand these changes in microstructure and properties, the physical model for the simulation of temperature and quasistatic stress fields was established. Based on experimental investigation and physical models, the temperature field and stress field were simulated for Al-Si-Pb alloy. The starting melting position, largest crater depth, melting layer thickness, and quasistatic stress distribution were obtained. These results reveal the mechanism of crater formation on the surface and improvement of hardness and wear resistance.
Key words: Al-Si-Pb alloy; high current pulsed electron beam; numerical simulation; crater; quasistatic stress