Oxide Particle Growth During Friction Stir Welding of Fine Grain MA956 Oxide Dispersion-Strengthened Steel

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• 作者：Brad W. Baker ; Keith E. Knipling…
• 刊名：Metallurgical and Materials Transactions E
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：4
• 期：1
• 页码：1-12
• 全文大小：
• 刊物类别：Metallic Materials; Characterization and Evaluation of Materials; Structural Materials; Surfaces and
• 刊物主题：Metallic Materials; Characterization and Evaluation of Materials; Structural Materials; Surfaces and Interfaces, Thin Films; Nanotechnology; Energy, general;
• 出版者：Springer US
• ISSN：2196-2944
• 卷排序：4

文摘

Friction stir welding of an aluminum-containing oxide dispersion-strengthened steel causes significant oxide particle growth visible at both the nano- and microscales. Quantitative stereology of scanning electron images, small-angle X-ray scattering, energy-dispersive X-ray spectroscopy, and atom-probe tomography is used to quantify the degree of particle coarsening as a function of welding parameters. Results show the dispersed oxides are significantly coarsened in the stir zone due to a proposed combination of agglomeration, Ostwald ripening, and phase transformation within the Al₂O₃-Y₂O₃ system. This oxide particle coarsening effectively removes all strengthening contribution of the original oxide particles, as confirmed by uniaxial tensile tests and microhardness measurements.