Journal
MATERIALS & DESIGN
Volume 59, Issue -, Pages 516-523Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2014.03.012
Keywords
Stagger spinning; Nano/ultrafine crystal; Tube; Recrystallization annealing
Categories
Funding
- National Natural Science Foundation of China [51075153]
- Natural Science Foundation of Guangdong Province [10151040301000000]
- Key Laboratory of Precision Equipment and Manufacturing Technology of Guangdong Province [PEMT1202]
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A new method of manufacturing tubes with nano/ultrafine grain structure by stagger spinning and recrystallization annealing is proposed in this study. Two methods of the stagger spinning process are developed, the corresponding macroforming quality, microstructural evolution and mechanical properties of the spun tubes made of ASTM 1020 steel are analysed. The results reveal that a good surface smoothness and an improved spin-formability of spun parts can be obtained by the process combining of 3-pass spinning followed by a 580 degrees C x 0.5 h static recrystallization and 2-pass spinning with a 580 degrees C x 1 h static recrystallization annealing under the severe thinning ratio of wall thickness reduction. The ferritic grains with an average initial size of 50 mu m are refined to 500 nm after stagger spinning under the 87% thinning ratio of wall thickness reduction. The equiaxial ferritic grains with an average size of 600 nm are generated through re-nucleation and grain growth by subsequent recrystallization annealing at 580 degrees C for 1 h heat preservation. The tensile strength of spun tubes has been founded to be proportional to the reciprocal of layer spacing of pearlite (LSP), and the elongation is inversely proportional to the reciprocal of LSP. This study shows that the developed method of stagger power spinning has the potential to be used to manufacture bulk metal components with nano/ultrafine grain structure. (C) 2014 Elsevier Ltd. All rights reserved.
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