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- Title
Microstructural Evolution and Mechanism of Grain Refinement During Annealing of Cold-Drawn Copper Clad Steel Wires.
- Authors
Li, Hongjuan; Ding, Zhimin; Tan, Fengliang; Liu, Baogang
- Abstract
Microstructural analysis of copper clad steel (CCS) wires was performed after annealing using electron backscattered diffraction and a transmission electron microscope. Precipitation at the Cu/Fe interfaces was investigated, and the grain refinement mechanism was discussed. The results showed that elongated grains of copper and steel were gradually transformed into equiaxed grains after annealing. The grain sizes were increased with enhancing annealing temperature. The grains of copper and steel near the Cu/Fe interfaces showed a finer grain size distribution than those away from the interfaces. The microstructures of both copper and steel affected the deformation and re-crystallization of grains and sub-grains under the cladding state condition. The deformed grains were gradually transformed into re-crystallized grains and sub-grains with increasing annealing temperature. A number of precipitated Cu and α-Fe phases, ranging from 10 nm to 60 nm, were located near the Cu/Fe interfaces of CCS wires at the annealing temperature of 8°C. Based on a rigorous microstructural investigation, the grain refinement mechanism could be attributed to the appearance of sub-grains and precipitated phases at the Cu/Fe interfaces of CCS wires.
- Subjects
GRAIN refinement; STEEL wire; ANNEALING of metals; PARTICLE size distribution; TRANSMISSION electron microscopes; COPPER analysis; WIRE
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2020, Vol 72, Issue 6, p2134
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-019-03923-9