Correlation of austenite stability and ductile-to-brittle transition behavior of high-nitrogen 18Cr-10Mn austenitic steels
SCIE
SCOPUS
- Title
- Correlation of austenite stability and ductile-to-brittle transition behavior of high-nitrogen 18Cr-10Mn austenitic steels
- Authors
- Byoungchul Hwang; Tae-Ho Lee; Seong-Jun Park; Chang-Seok Oh; Kim, SJ
- Date Issued
- 2011-09-15
- Publisher
- Elsevier B.V.
- Abstract
- Ductile-to-brittle transition behavior of high-nitrogen 18Cr-10Mn austenitic steels containing different contents of Ni, Mo, Cu as well as nitrogen is discussed in terms of austenite stability and associated deformation-induced martensitic transformation (DIMT). Electron back-scattered diffraction and transmission electron microscopy analyses of cross-sectional area of the Charpy impact specimens fractured at -196 degrees C indicated that the brittle fracture planes were almost parallel to one of {1 1 1} slip planes and some metastable austenites near the fracture surface were transformed to alpha'-martensite by localized plastic deformation occurring during crack propagation. Quantitative evaluation of deformation-induced martensite together with characteristics of true stress-strain and load-displacement curves obtained from tensile and Charpy impact tests, respectively, supported that DIMT might take place in high-nitrogen austenitic steels with relatively low austenite stability. The occurrence of DIMT decreased low-temperature toughness and thus increased largely ductile-to-brittle transition temperature (DBTT), as compared to that predicted by empirical equations strongly depending on nitrogen content. As a result, the increased DBTT could be reasonably correlated with austenite stability against DIMT. (C) 2011 Elsevier B.V. All rights reserved.
- Keywords
- High-nitrogen austenitic steels; Ductile-to-brittle transition; Austenite stability; Deformation-induced martensite; Brittle fracture; CLEAVAGE-LIKE FRACTURE; STAINLESS-STEELS; LOW-TEMPERATURES; MARTENSITIC-TRANSFORMATION; MECHANICAL-PROPERTIES; DEFORMATION; TOUGHNESS; ALLOYS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/16672
- DOI
- 10.1016/J.MSEA.2011.06.025
- ISSN
- 0921-5093
- Article Type
- Article
- Citation
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 528, no. 24, page. 7257 - 7266, 2011-09-15
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