FeNiCrSiMoMnC合金气雾化熔滴的运动与传热行为模拟分析  

Simulation and Analysis of Motion and Heat Transfer Behavior of FeNiCrSiMoMnC Alloy Droplets in Gas Atomization

作　　者：胡云飞 李景昊 周香林[1] 杜开平 马尧 于月光 Yunfei Hu;Jinghao Li;Xianglin Zhou;Kaiping Du;Yao Ma;Yueguang Yu(State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China;Department of Mechanical Engineering,Mcgill University,Montreal,QCH2A0C3,Canada;BGRIMM Technology Group,Beijng 100160)

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083 [2]加拿大麦吉尔大学机械工程系,蒙特利尔QCH2A0C3 [3]北京矿冶科技集团有限公司,北京100160

出　　处：《热喷涂技术》2019年第2期19-23,72,共6页Thermal Spray Technology

基　　金：国家重点研发计划(2017YFB0306100);国家自然科学基金(51271034)项目

摘　　要：气雾化过程中合金液流被高压气流破碎后,要飞行一段距离才开始冷却凝固,这称为熔滴的飞行过程。本文以重载耐磨耐腐蚀激光熔覆涂层用FeNiCrSiMoMnC合金为对象,通过建立熔滴飞行过程的模型,并对该过程进行数值模拟,计算讨论了雾化气体初始速率、熔滴直径对熔滴的速度、传热系数等参数的影响。结果表明,熔滴速度呈现先增大至最大值后逐渐减小的趋势,且随熔滴直径的增大,熔滴速度最大值点逐渐降低;传热系数与速度曲线相反,呈先下降后上升的趋势,极小值为2kg/d,熔滴直径越大,与气体速度差越小,传热系数越小;随气体初始速率的增大,熔滴最大速度点上移,同时传热系数也逐渐增大。In gas atomization, the broken droplets usually experience a short flight before their solidification. The flying process of a wear and corrosion resistant FeNiCrSiMoMnC alloy designed for the laser cladding coatings under heavy-duty condition is studied in this work. By a model established based on this process and numerical simulation, the influence of the initial gas velocity and droplet diameter on droplet velocity and heat transfer coefficient was investigated. The result shows that the fused droplet velocity increases with the flight distance at the first stage and then decreases gradually, and the maximum droplet velocity points decrease with the incremental of droplet diameter. On the contrary, the heat transfer coefficient declines sharply before it rises, the minimum value is 2kg/d. An increasing droplet diameter leads to a smaller velocity difference between the droplet and gas, thus a smaller heat transfer coefficient. The maximum droplet velocity moves up along with the initial gas velocity, at the same time, the heat transfer coefficient also increases.

关 键 词：气雾化 铁基合金 热交换 数学模型 数值模拟 

分 类 号：TG174.4[金属学及工艺—金属表面处理]