• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2022, Vol. 58 ›› Issue (6): 62-72.doi: 10.3901/JME.2022.06.062

• 材料科学与工程 • 上一篇    下一篇

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脉冲电流对TA1/304复合板结合性能的改性机制研究

任忠凯1,2,3, 郭雄伟1,2,3, 李宁1, 李赫1, 王祖贵1, 王涛1,2,3   

  1. 1. 太原理工大学机械与运载工程学院 太原 030024;
    2. 太原理工大学先进金属复合材料成形技术与装备教育部工程研究中心 太原 030024;
    3. 太原理工大学中澳联合研究中心 太原 030024
  • 收稿日期:2021-07-02 修回日期:2021-10-29 出版日期:2022-03-20 发布日期:2022-05-19
  • 通讯作者: 王涛,男,1985年出生,博士,教授,博士研究生导师。主要研究方向为轧制工艺及设备、金属层状复合板轧制复合机理。E-mail:tyutwt@163.com
  • 作者简介:任忠凯,男,1988年出生,博士,副研究员,硕士研究生导师。主要研究方向为复合板轧制复合机理与精密极薄带轧制板形控制理论。E-mail:zhongkai_0808@126.com
  • 基金资助:
    国家自然科学基金(51804215,51905372)、国家重点研发计划(2018YFA0707300)和中央引导地方科技发展专项资金(YDZX20191400002149)资助项目。

Study on the Modification Mechanism of Pulse Current on the Bonding Properties of TA1/304 Composite Plate

REN Zhongkai1,2,3, GUO Xiongwei1,2,3, LI Ning1, LI He1, WANG Zugui1, WANG Tao1,2,3   

  1. 1. College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024;
    2. Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024;
    3. TYUT-UOW Joint Research Centre, Taiyuan University of Technology, Taiyuan 030024
  • Received:2021-07-02 Revised:2021-10-29 Online:2022-03-20 Published:2022-05-19

摘要: 针对传统热轧制备TA1/304复合板过程中存在高温易生成脆性化合物、低温不易结合的问题,提出了采用真空组坯+脉冲电流辅助轧制新方法。首先系统研究了750℃和300 A恒定电流作用下,24.4%、41.6%、54.4%不同轧制压下率对复合板的影响,发现41.6%压下率下剪切强度最高,达到356 MPa。在此基础上,针对41.6%压下率的轧制试验进一步分析了电流密度对TA1/304轧制复合的影响,分别进行了电流密度为0.57 A/mm2、1.15 A/mm2和1.72 A/mm2的轧制试验。不同电流密度下的试验结果表明,0.57 A/mm2时元素扩散不充分,剪切强度为296 MPa。1.15 A/mm2时界面元素扩散显著增加,结合强度提高,获得了良好冶金结合效果。而1.72 A/mm2电流密度较大,导致扩散加速引起的Kirkendall微孔洞,导致拉伸剪切强度下降,仅为209 MPa。因此,适当的电流密度与压下率相匹配是TA1/304不锈钢复合板在较低温度、较小压下率下界面结合强度大幅提高的关键因素。

关键词: TA1/304复合板, 脉冲电流, 剪切强度, 微观组织, 元素扩散

Abstract: In order to solve the problem that brittle compounds are easy to be formed at high temperature and difficult to combine at low temperature in the process of preparing TA1/304 composite plate by traditional hot rolling, a new method of vacuum billet and pulse current-assisted rolling is proposed. First of all, under the action of 750 ℃ and 300 A constant current, the effects of 24.4%, 41.6% and 54.4% rolling reduction on the composite plate were studied systematically. It was found that the shear strength of 41.6% reduction was the highest, reaching 356 MPa. On this basis, according to the rolling test of 41.6% reduction rate, the effect of current density on TA1/304 rolling composite was further analyzed, and the rolling tests with current density of 0.57 A/mm2, 1.15 A/mm2 and 1.72 A/mm2 were carried out respectively. The experimental results under different current densities show that the element diffusion is not sufficient and the shear strength is 296 MPa during 0.57 A/mm2. During 1.15 A/mm2, the diffusion of interfacial elements increases significantly, the bonding strength increases, and a good metallurgical bonding effect is obtained. On the other hand, the higher current density of 1.72 A/mm2 leads to the microvoids in Kirkendall caused by accelerated diffusion, which leads to the decrease of tensile shear strength, which is only 209 MPa. Therefore, the matching of appropriate current density and reduction rate is the key factor to greatly improve the interfacial bonding strength of TA1/304 stainless steel clad plate at lower temperature and lower reduction rate.

Key words: TA1/304 composite plate, pulsed current, shear strength, microstructure, element diffusion

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