Effect of nitrogen on formation of martensite-austenite constituent in low carbon steels

Staiger, M. P., Jessop, B., Hodgson, Peter D., Brownrigg, A. and Davies, C. H. J. 1999, Effect of nitrogen on formation of martensite-austenite constituent in low carbon steels, ISIJ international, vol. 39, no. 2, pp. 183-190, doi: 10.2355/isijinternational.39.183.

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Title Effect of nitrogen on formation of martensite-austenite constituent in low carbon steels
Author(s) Staiger, M. P.
Jessop, B.
Hodgson, Peter D.
Brownrigg, A.
Davies, C. H. J.
Journal name ISIJ international
Volume number 39
Issue number 2
Start page 183
End page 190
Total pages 8
Publisher Iron and Steel Institute of Japan
Place of publication Tokyo, Japan
Publication date 1999
ISSN 0915-1559
1347-5460
Keyword(s) martensite/retained austenite
nitrogen
drawability
wire drawing
wire-rod
dilatometry
hardenability
titranium nitride
Summary The effect of dissolved nitrogen on phase transformations and microstructural evolution in low-carbon high manganese silicon steel wire-rod was examined for varying nitrogen levels of 30, 70, and 100 ppm, while keeping the base composition constant. It was found that nitrogen suppresses the pearlite reaction start temperature by up to 30°C. A strong correlation was discovered between the nitrogen level and the formation of martensite-austenite microconstituent (MA phase). The possible mechanisms by which nitrogen causes the formation of MA phase are discussed. The main conclusion drawn from this study is that levels of nitrogen between 70 and 110 ppm can have a significant effect on microstructure, such that up to approximately 10vol% of MA phase is formed in these steels. Microstructural changes in titanium-microalloyed steels were also investigated - particularly changes in the development of the MA and pearlite phases. The pearlite content was up to double that found in a Ti-free alloy. Microalloying with titanium was found to be effective in completely eliminating MA phase.
Language eng
DOI 10.2355/isijinternational.39.183
Field of Research 09 Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©1999, ISIJ
Persistent URL http://hdl.handle.net/10536/DRO/DU:30098439

Document type: Journal Article
Collection: Office of the Deputy Vice-Chancellor (Research)
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