• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2021, Vol. 57 ›› Issue (9): 167-174.doi: 10.3901/JME.2021.09.167

• 数字化设计与制造 • 上一篇    下一篇

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选区激光熔化工艺参数对燃料电池316L不锈钢双极板性能的影响

林开杰1,2, 董伟菘1,2, 顾冬冬1,2, 全景峰1,2, 乔竞驰1,2, 王超超1,2   

  1. 1. 南京航空航天大学材料科学与技术学院 南京 210016;
    2. 南京航空航天大学江苏省高性能金属构件激光增材制造工程实验室 南京 210016
  • 收稿日期:2020-10-08 修回日期:2021-03-10 出版日期:2021-05-05 发布日期:2021-06-15
  • 通讯作者: 顾冬冬(通信作者),男,1980年出生,博士,教授,博士研究生导师。主要研究方向为高性能金属构件的增材制造。E-mail:dongdonggu@nuaa.edu.cn
  • 作者简介:林开杰,男,1988年出生,博士,讲师,硕士研究生导师。主要研究方向为高性能金属构件的增材制造。E-mail:kaijie_lin@nuaa.edu.cn
  • 基金资助:
    国家自然科学基金(51905269、51735005)、国防基础科研计划(JCKY2020605C007)、航空科学基金(2020Z049052001)、江苏省自然科学基金(BK20170787)、(BRA20190481)、江苏省第十五批“六大人才高峰”创新人才团队(TD-GDZB-001)、2017年度江苏省高校优秀科技创新团队、国家自然科学基金创新研究群体(51921003)资助项目。

Effect of Laser Powder Bed Fusion Process Parameters on Performance of 316L Stainless Steel Bipolar Plates

LIN Kaijie1,2, DONG Weisong1,2, GU Dongdong1,2, QUAN Jingfeng1,2, QIAO Jingchi1,2, WANG Chaochao1,2   

  1. 1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016;
    2. Jiangsu Provincial Engineering Laboratory for Laser Additive Manufacturing of High-Performance Metallic Components, Nanjing University of Aeronautics and Astronautics, Nanjing 210016
  • Received:2020-10-08 Revised:2021-03-10 Online:2021-05-05 Published:2021-06-15

摘要: 316L不锈钢材料具有耐蚀性好、成形性好、成本低等优点,在燃料电池金属双极板领域有着良好的应用前景。基于传统等材、减材加工方法难以成形复杂结构燃料电池双极板的瓶颈,使用选区激光熔化技术可实现复杂结构316L不锈钢双极板的成形制造。针对燃料电池不锈钢金属双极板的应用背景,系统研究了不同激光工艺参数(激光功率、激光扫描速度)对所成形316L不锈钢材料微观组织及双极板所需耐蚀性和表面接触电阻的影响,并对比了传统锻造316L不锈钢与选区激光熔化316L不锈钢在显微组织和性能上的差异。结果表明,选区激光熔化成形316L不锈钢的致密度随着激光功率的增大而增大,随着扫描速度的增大而减少,并在激光功率为300 W,扫描速度为1 500~2 000 mm/s时达到最大值。相比于具有等轴晶特征的锻造不锈钢试样,选区激光熔化成形不锈钢试样柱状晶组织有利于降低晶界对电流的阻碍作用,从而降低了表面接触电阻;同时,随着样品表面粗糙度的提高,选区激光熔化成形不锈钢试样的表面接触电阻降低。致密度高的选区激光熔化成形不锈钢试样的耐蚀性优于锻造成形不锈钢试样,且随着致密度的减小,选区激光熔化成形试样的耐蚀性逐渐降低。本研究结果表明选区激光熔化成形316L不锈钢材料可用于燃料电池金属双极板。

关键词: 选区激光熔化, 316L不锈钢, 燃料电池, 金属双极板

Abstract: Due to the advantages of high corrosion resistance, good formability and low cost, 316L stainless steel exhibits great potential in the application of fuel cell bipolar plates. However, retarded by the forming capability of traditional manufacturing methods, it is difficult to fabricate bipolar plates with complex flow-field structures. Therefore, laser powder bed fusion (LPDF) has been employed to fabricate 316L stainless steel bipolar plate, and the influence of laser parameters (laser power and laser scanning speed) on the microstructure, corrosion resistance and interfacial contact resistance (ICR) of LPDFed 316L stainless steel are systematically studied. Besides that, the differences in microstructures and performance between wrought 316L stainless steel and LPDFed 316L stainless steel are compared. The results show that with the increase of laser power or decrease of scanning speed, the density of the LPDFed 316L stainless steel specimens decreased. When the laser power is 300 W, and the scanning speed ranged from 1 500 mm/s to 2 000 mm/s, specimens with densities higher than 99% can be achieved. Compared with the wrought stainless-steel specimens with the microstructures of equiaxed grains, the columnar crystal structures of the LPDFed counterparts facilitated the flow of electron, thus contributing to the reduction of ICR value. In addition, the ICR value of LPDFed 316L stainless steel specimens decreased with the increase of the surface roughness. The results of electro-chemical tests show that the corrosion resistance of LPDFed 316L stainless steel specimens with high relative density was better than that of wrought counterparts. And the corrosion resistance of LPDFed 316L stainless steel specimens gradually deteriorated with the decrease of relative density. Our results revealed that LPBF method can be utilized to fabricate 316L stainless steel bipolar plates for the fuel call application.

Key words: laser powder bed fusion, 316L stainless steel, fuel cell, metal bipolar plate

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