钎涂感应参数对基体温度场的影响  

Effect of Brazing Coating Induction Parameters on Temperature Field

作　　者：石秋生 赵梦琪 陈林[1] 杨冠军[1] SHI Qiusheng;ZHAO Mengqi;CHEN Lin;YANG Guanjun(State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学金属材料强度国家重点实验室,西安710049

出　　处：《中国表面工程》2022年第2期152-159,共8页China Surface Engineering

基　　金：国家科技重大专项资助项目(2017-Ⅶ-0012-0107)。

摘　　要：重熔处理技术作为提高基体与涂层界面结合强度的方法之一,具有加热速度快、工作环境清洁等优点,但仍存在热影响偏大时造成基体损伤的风险。以感应重熔涂层为研究对象,建立二维有限元传热模型,研究涂层感应重熔过程中的温度场变化规律。以TC11钛合金基体表面感应重熔钛基涂层Ti49Zr49Be为典型材料,研究发现:集肤深度分别为4.0 mm、1.5 mm和0.6mm时,三种集肤深度下涂层熔化界面推移方式均不同,且基体热敏感温度区深度和持续时间随着集肤深度的减小呈现递减趋势;感应重熔功率分别为35 kW、45 kW和55 kW时,发现界面推移方式相同,均为涂层表面、涂层/基体界面处向涂层内部双向推移,且基体热敏感温度区深度和持续时间随加热功率的增加呈现递减的趋势。涂层感应重熔过程传热模型和温度场变化规律研究表明,增大功率、减小集肤深度有助于工程应用中抑制基体热影响。To improve the interface bonding strength between substrate and coating,remelting technology has been applied as an environmental friendly approach with fast heating speed.However,the substrate might be deterioded by the over heating by induction during brazing coating process.A two-dimensional finite element model of heat transfer for induction remelting coating is established to examine the temperature field.Taking titanium-based coating Ti49Zr49Be on TC11 titanium alloy substrate as typical material system,the following conclusions can be drawn.The melting interface moves forward by different ways when the skin depths are 4.0 mm,1.5 mm and 0.6 mm,respectively.It is found that both depth and duration of thermal sensitive temperature zone of substrate decrease with the decrease of the skin depth.When the induction remelting power is 35 kW,45 kW and 55 kW,it is found that the interface moves by the same way from both coating surface and coating/substrate interface to the coating center.In addition,both depth and duration of thermal sensitive temperature zone of the substrate decrease with the increase of heating power.Based on the heat transfer model and variation of temperature field,it is demonstrated that increasing power and decreasing skin depth are helpful to restrain the thermal effect of the substrate in engineering application.

关 键 词：感应重熔 集肤深度 有限元法 温度分布 固液界面 

分 类 号：TG174[金属学及工艺—金属表面处理]