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| 搅拌摩擦焊制备7075铝合金泡沫夹芯板塑性变形及发泡工艺研究 |
| Plastic Deformation and Foaming Process of 7075 Aluminum Alloy Foam Sandwich Plate Prepared by Friction Stir Welding |
| Received:March 02, 2022 |
| DOI：10.3969/j.issn.1674-6457.2022.04.009 |
| 中文关键词: 泡沫铝夹芯板 搅拌摩擦焊 成形性能 发泡性能 |
| 英文关键词: aluminum foam sandwich plate friction stir welding formability foaming |
| 基金项目:湖北省重点研发计划(2020BAB140);湖北省教育厅科学研究计划(B2020245);湖北省自然科学基金(2021CFB523) |
| Author Name | Affiliation | | WU Zheng-jian | Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan 430070, China | | PANG Qiu | Key Laboratory of Metallurgical Equipment and Control Technology of the Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China | | HU Zhi-li | Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan 430070, China
Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan 430070, China
Hubei Engineering Research Center for Green & Precision Material Forming, Wuhan University of Technology, Wuhan 430070, China |
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| 中文摘要: |
| 目的 研究搅拌摩擦焊(FSW)制备泡沫铝夹芯板(AFS)预制坯的成形规律和发泡过程中泡孔的演变规律。方法 采用搅拌摩擦焊工艺制备7075铝合金泡沫夹芯板。利用金相显微镜和扫描电子显微镜对不同焊接参数条件下AFS预制坯组织形貌进行分析，同时，利用单向拉伸和高温杯突试验对不同温度下AFS预制坯的成形性能进行研究，并且针对AFS预制坯发泡性能及不均匀热变形行为对发泡性能的影响进行分析。结果 在焊接转速为2 000 r/min、进给速度为50 mm/min情况下，可获得板粉混合均匀、无明显缺陷的接头;在450 ℃时，搅拌摩擦焊制备的预制体与轧制板材的成形性能相似，真应变达到0.55，伸长率高达73%。450 ℃下杯突试验样品再结晶比例从60.6%增加至82.7%。在680 ℃发泡温度下，保温225 s，能够制备孔径结构均匀、高质量的铝合金泡沫夹芯板。结论 搅拌摩擦焊工艺制备的预制坯经过塑性变形后进行发泡，可以获得具有均匀孔隙结构的泡沫夹芯板弯曲部件。 |
| 英文摘要: |
| The work aims to study the forming law of aluminum foam sandwich plate (AFS) preform prepared by friction stir welding (FSW) and the evolution law of pores during foaming. 7075 aluminum foam sandwich plate was prepared by friction stir welding. Microstructure and morphology of aluminum foam sandwich plate preform under different welding process parameters were analyzed by optical microscopy and scanning electron microscopy. At the same time, the forming properties of AFS preform at different temperature were studied by uniaxial tensile test and high temperature cupping test. Moreover, the effect of foaming properties and uneven thermal deformation behavior of AFS preform on foaming properties was analyzed. The welding joint with uniform powder mixing and no obvious defects was obtained at the welding speed of 2 000 r/min and feeding speed of 50 mm/min. At 450 ℃, the formability of the preform prepared by friction stir welding was similar to that of the rolled sheet, with the true strain reaching 0.55 and the elongation reaching 73%. The recrystallization ratio of the cupping test sample at 450 ℃ increased from 60.6% to 82.7%. Under the foaming temperature of 680 ℃ and holding time of 225 s, the aluminum alloy foam sandwich plate with uniform pore structure and high quality could be prepared. The foam sandwich plate bending parts with uniform pore structure can be obtained through the foaming of the preform prepared by friction stir welding after plastic deformation. |
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