IN718合金多道熔覆热循环特性模拟及实验验证  

Simulation and experimental verification of thermal cycling characteristics of IN718 superalloy multi-pass cladding

作　　者：李博远 舒林森[1,2] 陈向东 陈彦龙 王家胜 LI Bo-yuan;SHU Lin-sen;CHEN Xiang-dong;CHEN Yan-long;WANG Jia-sheng(School of Mechanical Engineering,Shaanxi University of Technology,Hanzhong 723001,China;Shaanxi Key Laboratory of Industrial Automation,Hanzhong 723001,China;Avic Shaanxi Aircraft Industry(Group)Corporation Ltd,Hanzhong 723215,China)

机构地区：[1]陕西理工大学机械工程学院,陕西汉中723001 [2]陕西省工业自动化重点实验室,陕西汉中723001 [3]陕西飞机工业有限责任公司,陕西汉中723215

出　　处：《材料热处理学报》2024年第4期207-215,224,共10页Transactions of Materials and Heat Treatment

基　　金：陕西省重点研发计划(S2022-YF-YBGF-0437);陕西省教育厅一般专项科研计划项目(22JK0312)。

摘　　要：为了揭示激光熔覆过程的热量累积特性及规律,利用ANSYS软件对IN718高温合金多道熔覆涂层制备过程热循环进行模拟。通过构建“T”型高斯复合热源并开发ANSYS APDL程序再现激光熔覆过程,获得涂层温度分布及热循环特性。结果表明:熔覆涂层高温区域以半椭球形快速扩散,跟随“弓”字型路径产生热累积;在扫描方向上,各节点最高温度(2309.26℃→2417.15℃→2454.58℃)呈非线性缓慢升高的趋势;以“弓”型路径熔覆会在搭接折弯处显著储能,对已熔涂层造成了重复加热或重熔;在结合界面上,中间道次熔覆时涂层热源生热与热传导具有对称性,使介面温度高于金属粉末材料熔点。采用红外热像测温法对熔覆过程进行监测,监测结果与模拟结果基本吻合,为熔覆工艺优化与涂层微观组织调控提供了理论依据。In order to reveal the heat accumulation characteristics and rules of laser cladding process,ANSYS software was used to simulate the thermal cycling during the preparation process of IN718 superalloy multi-pass cladding coating.By constructing a“T”type Gaussian composite heat source and developing an ANSYS APDL program to reproduce the laser cladding process,the temperature distribution and thermal cycling characteristics of the coating were obtained.The results show that the high-temperature area of the cladding coating rapidly diffuses in a semi-ellipsoidal shape,following a“bow”shaped path to generate heat accumulation.In the scanning direction,the maximum temperature of each node(2309.26℃→2417.15℃→2454.58℃)shows a nonlinear and slow increasing trend.Using a“bow”shaped path for cladding will significantly store energy at overlapping bends,causing repeated heating or remelting of the melted coating.At the bonding interface,there is symmetry between the heat generation and heat conduction of the coating heat source during the intermediate pass cladding,resulting in the interface temperature being higher than the melting point of the metal powder material.The infrared thermal imaging temperature measurement method is used to monitor the cladding process,and the monitoring results are basically consistent with the simulation results,providing a theoretical basis for optimizing the cladding process and regulating the microstructure of the coating.

关 键 词：IN718合金 激光熔覆 热循环 数值模拟 红外热像 

分 类 号：TG132.3[一般工业技术—材料科学与工程]