Inhibition of Abnormal Grain Growth during Isothermal Holding after Heavy Deformation in Nb Steel
- Title
- Inhibition of Abnormal Grain Growth during Isothermal Holding after Heavy Deformation in Nb Steel
- Author
- 신동혁
- Keywords
- low carbon steels; ultrafine grains; severe plastic deformation; equal channel angular pressing; microstructure; tensile properties
- Issue Date
- 2002-12
- Publisher
- IRON STEEL INST JAPAN KEIDANREN KAIKAN
- Citation
- ISIJ INTERNATIONAL, v. 42, issue. 12 SPEC, page. 1490-1496
- Abstract
- Equal channel angular pressing (ECAP) was conducted on the two grades of low carbon steel, with or
without vanadium, in order to produce an ultarfine grained structure. As a result, the ferrite grains were refined from 30 mm to 0.20.3 mm. The strength of the ECAPed steels increased remarkably, over twice of
the strength of the steels before ECAP. A series of static annealing experiments showed that the increment
of ECAP strain and the dilute addition of microalloying element such as vanadium were very effective on enhancing thermal stability of the ultrafine gained low carbon steels produced by ECAP in terms of microstructure and tensile properties. This enhanced thermal stability resulted from; (a) presence of excessive carbon
content in the ferrite matrix by carbon dissolution from pearlitic cementite during ECAP; (b) preservation of
high dislocation density due to addition of vanadium, providing the effective diffusion path for dissolved carbon atoms; (c) precipitation of excessive carbon as the form of nano-sized cementite particles during subsequent annealing and its effect on suppressing grain growth.
- URI
- https://www.jstage.jst.go.jp/article/isijinternational1989/42/12/42_12_1490/_articlehttps://repository.hanyang.ac.kr/handle/20.500.11754/158189
- ISSN
- 0915-1559
- DOI
- 10.2355/isijinternational.42.1490
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
- Files in This Item:
There are no files associated with this item.
- Export
- RIS (EndNote)
- XLS (Excel)
- XML