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Mironov, Sergey
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Publications (7/7 displayed)
- 2023The evolution of abnormal grains during the heating stage of a post-weld solution treatment in a friction-stir-welded 2519 aluminium alloycitations
- 2020Repeated measurements and quality of estimates in the analysis of NPP pipeline erosion-corrosion wearcitations
- 2018EBSD characterization of cryogenically rolled type 321 austenitic stainless steelcitations
- 2017EBSD анализ микроструктуры аустенитной стали после прокатки в криогенных условиях
- 2016Grain growth during annealing of cryogenically-rolled Cu-30Zn brasscitations
- 2015A two-step approach for producing an ultrafine-grain structure in Cu-30Zn brasscitations
- 2012Криогенная пластическая деформация технически чистой меди. Механизмы, особенности формирования структуры, стабильность
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article
The evolution of abnormal grains during the heating stage of a post-weld solution treatment in a friction-stir-welded 2519 aluminium alloy
Abstract
This work presents an in-depth investigation of the early stages of abnormal grain growth (AGG) in a friction-stir-welded (FSWed) 2519-T820 aluminium alloy. Microstructural evolutions, which occurred during the heating stage of a solution heat treatment (SHT), were studied. It was found that the welded materials underwent a complex sequence of precipitation phenomena, which eventually led to AGG. The evolution of precipitates was found to be heavily dependent on the FSW temperature condition. In a weld produced with a low-heat input, a significant portion of the precipitates were retained in the stir zone after FSW and then underwent coarsening and a subsequent dissolution during the annealing that followed. This led to a reduction in precipitation-pinning forces and thus promoted rapid grain coarsening. In a weld produced with a high-heat input, the initial precipitates were completely dissolved during the FSW, owing to the higher temperature, and then partially re-precipitated during the heating stage of the post-weld heat treatment. Due to the fine-grain structure of the stir zone, re-precipitation typically occurred at grain boundaries, thus promoting significant thermal stability. However, at temperatures approaching the SHT temperature, the new precipitates coarsened and then dissolved, resulting in AGG.