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Effect of Repetitive Equal Channel Angular Pressing on Microstructural Stability of Low Carbon Steel

Title
Effect of Repetitive Equal Channel Angular Pressing on Microstructural Stability of Low Carbon Steel
Author
신동혁
Keywords
low carbon steel; microstructure; ultrafine grain; spheroidization; equal channel angular pressing
Issue Date
2001-10
Publisher
대한금속재료학회(구 대한금속학회)
Citation
Metals and Materials International, v. 7, no. 5, page. 437-442
Abstract
The microstructure of ultrafine grained low carbon steel processed with repetitive equal channel angular pressing was investigated. A submicron ferrite grain size of ∼0.2 μm was achieved by pressings of up to 12 passes. Microstructural examination by TEM with SAD pattern on the pressed samples revealed the presence of high density dislocations inside the ferrite grains and ill-defined grain boundaries. These features became more significant as the number of pressings increased. The static annealing of the pressed samples at 753 K up to 24 hrs resulted in a recovery which was associated with the absorption of the dislocations by the grain boundaries. However, the recovery was inhibited as the number of pressings increased. The annealing process also led to the precipitation of cementite particles in ferrite colonies. The presence of precipitated particles inside the ferrite grains enhanced the microstructural stability of the low carbon steel at elevated temperatures.
URI
http://kiss.kstudy.com/thesis/thesis-view.asp?key=1810338https://link.springer.com/article/10.1007%2FBF03027084https://repository.hanyang.ac.kr/handle/20.500.11754/160078
ISSN
1598-9623; 2005-4149
DOI
10.1007/BF03027084
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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