location: Current position: Home >> Scientific Research >> Paper Publications

预热对Al2O3陶瓷激光熔覆层温度梯度影响的模拟

Hits:

Date of Publication:2013-01-01

Journal:稀有金属材料与工程

Affiliation of Author(s):机械工程学院

Volume:42

Issue:10

Page Number:2039-2042

ISSN No.:1002-185X

Abstract:A finite element model for single track laser cladding Al2O3 ceramic on Ti6Al4V substrate was established using ANSYS software. By observing the molten pool's morphology and measuring the temperature, the simulation shows a good agreement with the experiment, which indicates that the model is reliable. Furthermore, the variation of temperature gradient during the cooling stage and the effect of preheating on temperature gradient were both analyzed. The results show that the temperature gradient decreases with the temperature decreasing during the cooling stage. When the temperature drops to the plasticity point of alumina, the edge of the bonding between layer and substrate exhibits a higher temperature gradient. So it is easy to form cracks at the edge of the bonding. And preheating substrate could reduce the temperature gradient sharply. The higher the preheating temperature is, the lower the temperature gradient is. So it is possible to restrain the crack formation by preheating substrate.

Note:新增回溯数据

Pre One:陶瓷结构件双激光束低应力近净成形机理与方法研究

Next One:飞秒激光烧蚀石英玻璃微槽截面形状仿真