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| SUS304不锈钢箔电流辅助微拉伸变形行为研究 |
| Current Assisted Micro-tensile Deformation Behavior of SUS304 Stainless Steel Foil |
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| DOI：10.3969/j.issn.1674-6457.2023.07.001 |
| 中文关键词: SUS304不锈钢箔 尺度效应 微拉伸 力学性能 组织演变 脉冲电流 |
| 英文关键词: SUS304 stainless steel foil size effect micro-tensile mechanical behavior microstructure evolution pulse current. |
| 基金项目:国家自然科学基金重点项目(51635005) |
| Author Name | Affiliation | | LI Hu-shan | Key Laboratory of Micro-Systems and Microstructures Manufacturing of Ministry of Education, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China | | CAO Yuan-yuan | Key Laboratory of Micro-Systems and Microstructures Manufacturing of Ministry of Education, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China | | ZHU Cheng-xi | Key Laboratory of Micro-Systems and Microstructures Manufacturing of Ministry of Education, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China | | DING Chao-gang | Key Laboratory of Micro-Systems and Microstructures Manufacturing of Ministry of Education, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China | | XU Jie | Key Laboratory of Micro-Systems and Microstructures Manufacturing of Ministry of Education, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China | | SHAN De-bin | Key Laboratory of Micro-Systems and Microstructures Manufacturing of Ministry of Education, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China | | GUO Bin | Key Laboratory of Micro-Systems and Microstructures Manufacturing of Ministry of Education, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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| 中文摘要: |
| 目的 基于电流辅助微拉伸实验，研究SUS304不锈钢箔的流动应力和微观结构的影响规律，为SUS304不锈钢箔的电流辅助微成形工艺提供指导。方法 通过电流辅助微拉伸工艺，研究在应变速率为0.001 s−1、频率为100 Hz、占空比为50%的条件下，不同电流密度和晶粒尺寸对SUS304不锈钢箔力学性能的影响规律，通过扫描电子显微镜和准原位电子背散射衍射分析电流密度和晶粒尺寸对SUS304不锈钢箔微观组织的影响规律。结果 SUS304不锈箔的流动应力随着晶粒尺寸的增加而降低。脉冲电流的引入可以降低SUS304不锈钢箔的流动应力，同时也降低了SUS304不锈钢箔整体的伸长率。随着电流密度的增加，韧窝尺寸变得大而深，断裂模式由准解理断裂向韧性断裂转变，脉冲电流改善了SUS304不锈钢箔的局部韧性。另外，脉冲电流可以减小KAM值，脉冲电流的引入可以减小几何必须位错密度，对于晶粒尺寸为11.98 μm的不锈钢箔，其几何必须位错密度降低得更显著，晶粒间变得更均匀，变形协调性更好。结论 采用电流辅助微拉伸有效降低了SUS304不锈钢箔的流动应力。晶粒尺寸较小的SUS304不锈钢箔具有更好的变形协调性。 |
| 英文摘要: |
| The work aims to study the effects of flow stress and microstructure of SUS304 stainless steel foil based on current-assisted micro-tensile experiments, to guide the current-assisted micro-forming process of SUS304 stainless steel foil. The effects of different current densities and grain sizes on the mechanical properties of SUS304 stainless steel foil at 0.001 s‒1 strain rate, 100 Hz and 50% duty cycle were investigated by current-assisted micro-tensile, and the effects of current density and grain size on SUS304 stainless steel foil microstructure were analyzed by SEM (Scanning Electron Microscopy) and quasi-in situ EBSD (Electron Backscattered Diffraction). The flow stress of SUS304 stainless steel foil decreased with the increase of grain size. The introduction of the pulse current reduced the flow stress of SUS304 stainless steel foil and the overall elongation of SUS304 stainless steel foil. With the increase of current density, the size of the ductile fracture became large and deep, and the fracture mode changed from quasi-dissolution fracture to ductile fracture, and the pulse current improved the local toughness of SUS304 stainless steel foil. In addition, the pulse current reduced the KAM (Kernel Average Misorientation) value, indicating that the introduction of pulse current could reduce the GND (Geometrically Necessary Dislocation) density, and the reduction of GND density was more significant for the foil with a grain size of 11.98 μm, with more uniform intergranular transformation and better deformation coordination. Current-assisted micro-tensile can effectively reduce the flow stress of SUS304 stainless steel foil. SUS304 stainless steel foil with a smaller grain size has better deformation coordination. |
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