【摘要】 扩散焊技术因具有较好的焊接性能在航空发动机、汽车能源、微化工装备制造等领域中具有广泛应用。为了研究不同工艺参数对扩散焊接质量的影响,同时兼顾经济、时间成本,运用分子动力学模拟软件LAMMPS,从微观层面分析了保温温度、压力、保温时间、降温速率对TC4钛合金扩散连接过程的影响。结果表明:TC4钛合金扩散连接过程中,主要是界面附近的钛原子扩散;相同条件下,扩散连接宽度随工艺参数的增大而增大;当保温温度达到1 100 K,压力达到3.5 MPa,保温时间超过400 ps时,TC4钛合金扩散连接效果较佳;保温时间一定时,随着保温温度升高,压力对扩散宽度的影响越来越明显。更多还原

【Abstract】 Diffusion welding technology has been widely used in the range of aviation engine,automobile energy and microchemical equipment manufacturing because of the good welding performance. In order to study the influence of different technological parameters on the diffusion welding quality,meanwhile the economy and time cost are also taken in consideration,the influence of temperature,pressure,time of heat preservation and rate of temperature fall on the width of the diffusion is analyzed with molecular dynamics software LAMMPS. The results show that in the TC4 diffusion bonding process,the diffusion is mainly occurred in the Ti atoms near the interface. Under the same conditions,the diffusion connection width increases with the increase of the technological parameters. When the temperature is greater than 1 100 K,the pressure is greater than 3. 5 MPa and the heat preservation time exceeds 400 ps,the TC4 diffusion bonding effect is better. When the heat preservation time is certain,the influence of pressure on diffusion width is more and more obvious as the heat insulation temperature increases.更多还原