稳态磁场对激光熔注球形WC颗粒分布的影响机理研究

doi:10.3901/JME.2021.01.240

机械工程学报 ›› 2021, Vol. 57 ›› Issue (1): 240-248.doi: 10.3901/JME.2021.01.240

• 制造工艺与装备 • 上一篇

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稳态磁场对激光熔注球形WC颗粒分布的影响机理研究

胡勇^1,2,3, 王梁^1,2,3, 娄复兴^1,2,3, 夏洪超^1,2,3, 张群莉^1,2,3, 姚建华^1,2,3

1. 浙江工业大学激光先进制造研究院杭州 310014;
2. 浙江工业大学高端激光制造装备省部共建协同创新中心杭州 310014;
3. 浙江工业大学特种装备制造与先进加工技术教育部重点实验室杭州 310014

收稿日期:2020-01-29 修回日期:2020-06-18 出版日期:2021-01-05 发布日期:2021-02-06
通讯作者: 姚建华(通信作者),男,1965年出生,博士,教授,博士研究生导师。主要研究方向为激光加工技术。E-mail:laser@zjut.edu.cn
作者简介:胡勇,男,1991年出生,博士研究生。主要研究方向为激光加工数值模拟。E-mail:zjuthuyong@foxmail.com
基金资助:
国家重点研发计划（2017YFB1103600）、国家自然科学基金（51705464，51804274）和浙江省属高校基本科研业务费（RF-C2019003）资助项目。

Mechanism Study of Steady Magnetic Field Effect on Spherical WC Particle Distribution during Laser Melt Injection

HU Yong^1,2,3, WANG Liang^1,2,3, LOU Fuxing^1,2,3, XIA Hongchao^1,2,3, ZHANG Qunli^1,2,3, YAO Jianhua^1,2,3

1. Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310014;
2. Collaborative Innovation Center of High-End Laser Manufacturing Equipment, Zhejiang University of Technology, Hangzhou 310014;
3. Key Laboratory of Special Purpose Equipment and Advanced Processing Technology of Ministry of Education, Zhejiang University of Technology, Hangzhou 310014

Received:2020-01-29 Revised:2020-06-18 Online:2021-01-05 Published:2021-02-06

摘要/Abstract

摘要： 利用稳态磁场对金属流体的粘滞效应，在316L不锈钢基体上制备颗粒梯度分布的WC/316L复合涂层。为研究稳态磁场对激光熔注球形WC颗粒分布的影响机理，建立了考虑固液相变、流动以及洛伦兹力的熔注熔池多物理场模型，分析稳态磁场对流场，洛伦兹力分布以及等效黏度的影响。采用多颗粒动力学模型与熔池模型耦合计算，研究稳态磁场对熔池颗粒运动的影响。实验与仿真结果均证实，随着磁场强度从0 T增大至1.2 T，WC颗粒集中分布在复合涂层表层的趋势增大。分析结果表明：稳态磁场可有效增加熔池流体的等效黏度，使得颗粒在熔池中对流体的跟随性增强；同时，外加稳态磁场可以明显抑制熔池Marangoni对流，进一步降低了颗粒的运动能力，使得颗粒难以运动至熔池内部，大部分增强颗粒集中于熔池上表层。

关键词: 激光熔注, 稳态磁场, 熔池, 复合涂层, 多物理场

Abstract: The viscous effect of steady magnetic field on metal fluid is used to prepare WC/316L composite coating with gradient distribution of particles on 316L stainless steel substrate. In order to study the mechanism of steady magnetic field effect on spherical WC particle distribution，laser melt injection (LMI) molten pool model was built with consider of solid-liquid phase change, Lorentz force and fluid flow. The influence of steady magnetic field on fluid flow field, Lorentz force distribution and equivalent viscosity is analyzed. Moreover, single particle dynamic model is used to study the effect of the steady magnetic field on the particle movement in the molten pool. Experimental and simulation results are confirmed that the tendency of WC particles concentrated on the surface of composite coating increases with the increase of the magnetic flux density from 0 T to 1.2 T. The results show that steady magnetic field can effectively increase the equivalent viscosity of molten pool fluid, which can enhance the particle fluid follow ability. Meanwhile, the Marangoni convection is suppressed by the steady magnetic field and the movement velocity of particle is further reduced. Therefore, the particles are difficult to move to the inside of molten pool and most of them are concentrated on the surface of the molten pool.

Key words: laser melt injection, steady magnetic field, molten pool, composite coating, multi-physical field

中图分类号:

TG156

胡勇, 王梁, 娄复兴, 夏洪超, 张群莉, 姚建华. 稳态磁场对激光熔注球形WC颗粒分布的影响机理研究[J]. 机械工程学报, 2021, 57(1): 240-248.

HU Yong, WANG Liang, LOU Fuxing, XIA Hongchao, ZHANG Qunli, YAO Jianhua. Mechanism Study of Steady Magnetic Field Effect on Spherical WC Particle Distribution during Laser Melt Injection[J]. Journal of Mechanical Engineering, 2021, 57(1): 240-248.

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稳态磁场对激光熔注球形WC颗粒分布的影响机理研究

Mechanism Study of Steady Magnetic Field Effect on Spherical WC Particle Distribution during Laser Melt Injection

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