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首页> 外文学位 >Friction stir welding of thin-sheet, age-hardenable aluminum alloys: A study of process/structure/property relationships.
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Friction stir welding of thin-sheet, age-hardenable aluminum alloys: A study of process/structure/property relationships.

机译：薄钢板，时效硬化铝合金的摩擦搅拌焊接：工艺/结构/性能关系的研究。

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摘要

Friction Stir Welding (FSW) is a relatively new joining process that, as a solid-state process, offers several advantages over conventional fusion welding. Although FSW has been used extensively for the joining of age-hardenable aluminum alloys, the detailed effects of process parameters on the microstructures and mechanical properties of these welds have not been studied, especially for thin-sheet alloys. The present study investigated the FSW of thin-sheet, age-hardenable aluminum alloys, including: the development and optimization of welding process parameters that produce high-integrity, defect-free welds; the systematic evaluation of the effect of the base metal microstructure, FSW process parameters, and corresponding weld zone thermal conditions on microstructure evolution across the weld zone; the analysis of FSW mechanical properties and fracture behavior; and the development of relationships between the process parameters, microstructure, properties, and fracture that allow the optimization of weld performance. Two alloy systems, viz., Al-Cu-Mg (2024) and Al-Cu-Li (2195) in naturally-aged and artificially-aged conditions, respectively, were studied.; Process optimization in 1 mm thick 2024-T3 sheet resulted in superior properties versus those of FS welds in thick sheet and plate, and nearly 100% joint efficiency. Microstructures, hardness and tensile properties of FS welds in 2024-T3 exhibited a strong dependency on process parameters. The heat of welding promoted various weld zone microstructures that were produced via the dissolution of base metal GPB zones, the nucleation of GBP and GPB II, and the nucleation and coarsening of S phase. SZ hardness for 2024-T3 welds exhibited a strong, but unusual dependency on the FSW process parameters, which was related to different mechanisms related to GPB zone formation.; The microstructures of FS welds in 1 mm thick 2195-T8 were generally insensitive to the FSW process parameters. For all weld heat inputs, FSW resulted in almost complete dissolution of the base metal strengthening phases T 1 and theta'' in the SZ and their partial dissolution in the HAZ, resulting in FSW hardness and tensile strength below that of the base metal and that were comparable to FSW weld properties obtained in thicker materials.
机译：搅拌摩擦焊（FSW）是一种相对较新的连接工艺，作为固态工艺，与传统的熔焊相比具有许多优势。尽管FSW已广泛用于时效硬化铝合金的连接，但尚未研究工艺参数对这些焊缝的微观结构和机械性能的详细影响，特别是对于薄板合金。本研究研究了薄的，可时效硬化的铝合金的FSW，包括：焊接工艺参数的开发和优化，以产生高完整性，无缺陷的焊接；系统评估基础金属微结构，FSW工艺参数和相应的焊接区热条件对整个焊接区组织演变的影响； FSW力学性能和断裂行为的分析；以及工艺参数，微观结构，性能和断裂之间关系的发展，从而可以优化焊接性能。研究了两种合金体系，分别是在自然时效和人工时效条件下的Al-Cu-Mg（2024）和Al-Cu-Li（2195）。在1mm厚的2024-T3钢板中进行工艺优化后，与在厚钢板和厚板中的FS焊缝相比，具有优越的性能，并且接头效率接近100％。 2024-T3中的FS焊缝的组织，硬度和拉伸性能表现出对工艺参数的强烈依赖性。焊接热促进了各种焊接区的微观结构，这些结构是通过贱金属GPB区的溶解，GBP和GPB II的成核以及S相的成核和粗化而产生的。 2024-T3焊缝的SZ硬度对FSW工艺参数表现出强烈但异常的依赖性，这与与GPB区域形成有关的不同机理有关。 1mm厚2195-T8的FS焊缝的微观结构通常对FSW工艺参数不敏感。对于所有焊接热输入，FSW导致SZ中的贱金属强化相T 1和theta''几乎完全溶解，而在HAZ中则部分溶解，导致FSW硬度和拉伸强度低于贱金属，而与在较厚材料中获得的FSW焊接性能相当。

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  • 作者

    Shukla, Alpesh Khushalchand.;

  • 作者单位

    Rensselaer Polytechnic Institute.;

  • 授予单位 Rensselaer Polytechnic Institute.;
  • 学科 Engineering Metallurgy.; Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 242 p.
  • 总页数 242
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 冶金工业;工程材料学;
  • 关键词

  • 入库时间 2022-08-17 11:40:25

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