• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2025, Vol. 61 ›› Issue (10): 128-140.doi: 10.3901/JME.2025.10.128

• 特邀专栏:高端装备表面强化防护与再制造 • 上一篇    

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双相不锈钢CMT-P电弧等离子体传热行为研究

刘博1, 张志强1, 康嘉杰2, 徐连勇3, 龚攀4,5, 罗任植1, 张天刚1   

  1. 1. 中国民航大学航空工程学院 天津 300300;
    2. 中国地质大学工程技术学院 北京 100083;
    3. 天津大学材料科学与工程学院 天津 200240;
    4. 华中科技大学材料科学与工程学院 武汉 430074;
    5. 华中科技大学材料成形与模具技术国家重点实验室 武汉 430074
  • 收稿日期:2024-11-02 修回日期:2025-02-05 发布日期:2025-07-12
  • 作者简介:刘博,男,2000年出生。主要研究方向为电弧成形数值仿真。E-mail:liubocauc@163.com;张志强(通信作者),男,1985年出生,博士,副教授,硕士研究生导师。主要研究方向为焊接与增材制造、激光清洗与材料计算与仿真。E-mail:zqzhang@cauc.edu.cn
  • 基金资助:
    国家自然科学基金(51905536)、天津市自然科学基金(22JCYBJC01280)、中央高校基本科研业务费自然科学重点(3122023039)和中国民航大学研究生科研创新(2023YJSKC01017)资助项目。

Investigations of Arc Plasma Heat Transfer Behavior in CMT-P Arc Manufacturing of Duplex Stainless Steel

LIU Bo1, ZHANG Zhiqiang1, KANG Jiajie2, XU Lianyong3, GONG Pan4,5, LUO Renzhi1, ZHANG Tiangang1   

  1. 1. College of Aeronautical Engineering, Civil Aviation University of China, Tianjin 300300;
    2. School of Engineering and Technology, China University of Geosciences, Beijing 100083;
    3. School of Materials Science and Engineering, Tianjin University, Tianjin 200240;
    4. School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074;
    5. State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074
  • Received:2024-11-02 Revised:2025-02-05 Published:2025-07-12

摘要: 冷金属过渡与脉冲(Cold metal transfer with pulse,CMT-P)技术拓宽了电弧成形过程中的热输入范围,并在双相不锈钢再制造修复过程中实现了对热输入的精确控制。然而,目前对于双相不锈钢CMT-P电弧成形过程中的热量传输、电弧形态和熔池流动等复杂物理过程尚不清楚。因此为了解决这一问题,采用双相不锈钢为研究对象,基于电磁动力学、流体力学及热力学等多学科理论,构建一个三维瞬态CMT-P电弧熔池多物理场耦合数值模型,阐明双相不锈钢CMT-P电弧成形过程中的传热行为。结果表明在脉冲阶段,弧柱区温度与输入电流存在正相关。在CMT阶段中,弧柱区温度不仅与输入电流存在正相关也会受到导电通路的影响。在送丝阶段,弧柱区温度随着导电通路的减小呈现着先增大后减小的变化趋势。此外,导电通路的减小会导致电流密度增大和高速区消失,进而增强了送丝阶段的成形稳定性。熔池形貌呈现双椭球状,并且熔池温度场形貌的变化与输入电流之间存在着滞后效应。

关键词: 双相不锈钢, 再制造与修复, 等离子体, 电弧传热, 数值仿真

Abstract: The cold metal transfer with pulse(CMT-P) technology has broadened the range of heat input in arc manufacturing and enabled more precise control over heat transfer during the remanufacturing and repairing processes -of duplex stainless steel components. However, the complex physical processes are still unclear such as heat transfer, arc behavior, and and molten pool dynamics during the arc manufacturing of duplex stainless steel CMT-P. To address the problem, based on electromagnetism, hydrodynamics, and thermodynamics theories, a transient three-dimensional CMT-P multi-physics field model, including arc and molten pool, has been developed, to study the arc plasma heat transfer behavior of duplex stainless steel. The results indicate that during the pulse phase, the temperature of arc plasma is only positively correlated with the input current. In the CMT phase, the temperature in the arc column region is not only positively correlated with the input current, but also affected by the conductive path. During the wire feeding stage, the temperature in the arc column region shows a significant trend of initially increases and then decreases with the shrinking of the conductive path. Meanwhile, as the conductive path decreases, the current density increases and the high-speed zone disappears. The current density increases and the high-speed zone disappears. The phenomenon effectively enhances the stability of the wire feeding stage. The temperature field of the molten pool exhibits a characteristic double ellipsoid shape, with a noticeable time lag between changes in the molten pool shape and the input current.

Key words: duplex stainless steel, remanufacturing and repair, plasma, arc heat transfer, numerical simulation

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