多层喷射沉积制备耐热铝合金管坯热流分析(Ⅱ)——沉积过程热流分析  

Analysis of the Heat Flow of Multi-Layer Spray Deposited Heat-Resistant Al Alloy Pipe Blank(Ⅱ)--the Heat Flow of Depositing Process

作　　者：袁武华[1] 陈振华[1] 徐海洋[1] 陈清[1] 

机构地区：[1]湖南大学材料科学与工程学院金属材料研究所,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2005年第1期78-82,共5页Journal of Hunan University:Natural Sciences

基　　金：湖南省科技厅资助项目(01GKY2030)

摘　　要：通过建立沉积阶段热流分析模型,对多层喷射沉积制备耐热铝合金管坯过程中喷射流沉积后的凝固和冷却进行了分析.喷射流沉积后与基体/沉积坯的传导热交换占热输出率的90%以上,在沉积过程中,沉积面的温度变化呈周期性的升降.计算结果表明,多层喷射沉积采用移动坩埚式扫描方式,延长了喷射流沉积时间间隔,喷射流沉积后可以获得103K/s以上的冷却速度.The heat flow of the depositing process in the course of the preparation of multi-layer spray deposited (MLSD) pipe blank of heat-resistant Al alloy was modeled. And the solidification and quench of the deposit were calculated and analyzed. It indicated that more than 90% of the total output heat was transferred by the heat conduction between deposit and substrate. The temperature on the deposit surface rose and dropped periodically during the depositing process. The result showed that the intervals of the deposition were prolonged by moving the crucible scanning style of MLSD, and the cooling rates of the deposits could reach above 10~3K·s^(-1). 

关 键 词：雾化 喷射沉积 耐热铝合金 

分 类 号：TG146[一般工业技术—材料科学与工程]