摘要
目的研究钎涂中涂层感应热和基体感应热对基体温度场的耦合效应。方法建立二维有限元模型,研究涂层制备全周期热载荷作用下涂层与基体的温度场变化规律,揭示涂层与基体感应热对基体热影响的耦合作用机制。以钛合金表面感应重熔钛基合金涂层为例,研究涂层和基体感应热耦合作用对基体的热影响,同时,对比研究涂层和基体感应热单独作用对基体的热影响。结果在涂层感应热和基体感应热共同作用下,发现了熔化界面从涂层表面和涂层/基体界面向涂层内部双向推移的现象,基体感应热对涂层熔化具有反向热输入作用。在本研究条件下,表面开始熔化后,经历0.38 s可以实现涂层熔透。结论两个单因素的作用并非简单叠加,共同作用下基体最高温度低于单因素作用之和,但基体最大相变深度和相变时间均高于单因素作用之和,涂层感应热与基体感应热存在耦合效应。在基体感应热使得基体具有高界面温度(但低于相变温度)的基础上,温度更高的涂层,通过进一步提高基体表层的最高温度,使得基体发生相变。
In order to study the coupling effect of coating induced heat and substrate induced heat on substrate temperature field in brazing coating process,a two-dimensional finite element model was established to study the change law of the temperature field between coating and substrate under thermal load during the full cycle of coating preparation,revealing the coupling mechanism of thermal effect of induced heat between coating and substrate on substrate.Taking the induction-remelted titanium-based alloy coating on the surface of titanium alloy as an example,thermal effect of induction thermal coupling between coating and substrate on substrate was studied.At the same time,thermal effect of separate action of induced heat of coating and substrate on substrate was compared.Under combined action of coating induced heat and substrate induced heat,it was found that the melting interface moved from the coating surface and coating/substrate interface to the interior of the coating in both directions.Substrate induced heat had reverse heat input effect on coating melting.Under conditions of the present study,melting of the whole coating finished after 0.38 s when the coating surface started to melt.Comparative research showed that the action of two individual factors was not simple superposition.Under combined action,the maximum temperature of substrate was lower than the sum of individual factor,but the maximum depth and time of phase transformation of substrate were higher than the sum of individual factor.There was a coupling effect between coating induced heat and substrate induced heat.On the basis of substrate induced heat making substrate have a high interface temperature(but lower than the phase transformation temperature),coating with higher temperature could make substrate phase transform by further increasing the maximum temperature of substrate surface.
作者
赵梦琪
石秋生
陈林
杨冠军
ZHAO Meng-qi;SHI Qiu-sheng;CHEN Lin;YANG Guan-jun(School of Materials Science and Engineering,Xi'an Jiaotong University,Xi'an 710049,China;State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,Xi'an 710049,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2022年第1期296-302,共7页
Surface Technology
基金
国家科技重大专项(2017-VII-0012-0107)。
关键词
感应重熔
涂层
有限元法
热源模型
温度场
induction remelting
coating
finite element method
heat source model
temperature field
