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Effect of Titanium Addition on High Temperature Workability of High Manganese Austenitic Steel

Title
Effect of Titanium Addition on High Temperature Workability of High Manganese Austenitic Steel
Author
김종렬
Keywords
high manganese austenite steel; high temperature workability; grain boundary segregation; Ti(C,N) precipitate; atom probe tomography
Issue Date
2018-03
Publisher
IRON STEEL INST JAPAN KEIDANREN KAIKAN
Citation
ISIJ INTERNATIONAL, v. 58, No. 3, Page. 535-541
Abstract
In the present study, the high temperature workability of high manganese austenitic steel has been examined to prevent the grain boundary embrittlement cracking problems in the continuous casting process. As-cast Fe-22Mn-0.4C steel exhibited poor hot ductility behaviors at 900 degrees C tensile test. Phosphorus segregation and BN precipitation at grain boundaries were mainly responsible for this deterioration. In order to enhance the hot ductility, titanium was added to this steel, and high temperature workability was compared in view of reduction of area in tensile test at 900 degrees C. BN precipitation at grain boundaries was effectively suppressed by the formation of interior Ti(C,N) precipitates. Furthermore, phosphorus atoms, a grain boundary embrittlement element, were observed to segregate at Ti(C,N) interfaces in Auger electron spectroscopy and atom probe tomography. These results show that titanium addition in Fe-22Mn-0.4C steel can effectively improve the high temperature workability by decreasing the segregation of phosphorus at grain boundary.
URI
https://www.jstage.jst.go.jp/article/isijinternational/58/3/58_ISIJINT-2017-385/_article/-char/ja/http://repository.hanyang.ac.kr/handle/20.500.11754/105418
ISSN
0915-1559
DOI
10.2355/isijinternational.ISIJINT-2017-385
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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