Direct measurement of carbon enrichment in the incomplete bainite transformation in Mo added low carbon steels

Y. Xia; G. Miyamoto; Z. G. Yang; C. Zhang; T. Furuhara

doi:10.1016/j.actamat.2015.03.021

Direct measurement of carbon enrichment in the incomplete bainite transformation in Mo added low carbon steels

Y. Xia, G. Miyamoto, Z. G. Yang, C. Zhang, T. Furuhara

Materials Design Division

Research output: Contribution to journal › Article › peer-review

59 Citations (Scopus)

Abstract

The overall kinetics and carbon enrichment in austenite during the incomplete isothermal bainite transformation in Fe-0.1C-1.5Mn-(0, 0.03, 0.3, 0.5, 1)Mo (mass%) alloys were investigated with quantitative metallography and Electron Probe Microanalysis in the transformation temperature range of 773-873 K. The incomplete transformation appears at 823-873 K when Mo addition exceeds 0.3 mass%; at 773 K substantial carbide precipitation accompanies bainite transformation and no transformation stasis is observed. Transformed fractions in the stasis stage are hardly affected by prior austenite grain size. Carbon concentrations in austenite in the stasis stage are lower than T₀ line and decrease with the increase of Mo addition and temperature. T₀′ limit, solute drag and WB_s limit theories are used to examine the experimentally measured carbon concentration limits in austenite, and their respective flaws are pointed out.

Original language	English
Pages (from-to)	10-18
Number of pages	9
Journal	Acta Materialia
Volume	91
DOIs	https://doi.org/10.1016/j.actamat.2015.03.021
Publication status	Published - 2015 Jun 1

Keywords

Bainite
Carbon enrichment
EPMA
Incomplete
Steel
transformation

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/j.actamat.2015.03.021

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title = "Direct measurement of carbon enrichment in the incomplete bainite transformation in Mo added low carbon steels",

abstract = "The overall kinetics and carbon enrichment in austenite during the incomplete isothermal bainite transformation in Fe-0.1C-1.5Mn-(0, 0.03, 0.3, 0.5, 1)Mo (mass%) alloys were investigated with quantitative metallography and Electron Probe Microanalysis in the transformation temperature range of 773-873 K. The incomplete transformation appears at 823-873 K when Mo addition exceeds 0.3 mass%; at 773 K substantial carbide precipitation accompanies bainite transformation and no transformation stasis is observed. Transformed fractions in the stasis stage are hardly affected by prior austenite grain size. Carbon concentrations in austenite in the stasis stage are lower than T0 line and decrease with the increase of Mo addition and temperature. T0′ limit, solute drag and WBs limit theories are used to examine the experimentally measured carbon concentration limits in austenite, and their respective flaws are pointed out.",

keywords = "Bainite, Carbon enrichment, EPMA, Incomplete, Steel, transformation",

author = "Y. Xia and G. Miyamoto and Yang, {Z. G.} and C. Zhang and T. Furuhara",

note = "Funding Information: A part of this research was supported by “Creation of Innovative Functions of Intelligent Materials on the Basis of Element Strategy” by CREST Basic Research Program. T.F. gratefully acknowledges the financial support provided by the Ministry of Education, Culture, Sports, Science, and Technology through a Grant-in-Aid for Scientific Research (B) No. 23360316 (2011–2013). X.Y. gratefully acknowledges the financial support from the Joint Education Program between Tohoku University and Tsinghua University, and National Natural Science Foundation of China (Grant No. 51471094 ). Publisher Copyright: {\textcopyright} 2015 Acta Materialia Inc.",

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AU - Xia, Y.

AU - Miyamoto, G.

AU - Yang, Z. G.

AU - Zhang, C.

AU - Furuhara, T.

N1 - Funding Information: A part of this research was supported by “Creation of Innovative Functions of Intelligent Materials on the Basis of Element Strategy” by CREST Basic Research Program. T.F. gratefully acknowledges the financial support provided by the Ministry of Education, Culture, Sports, Science, and Technology through a Grant-in-Aid for Scientific Research (B) No. 23360316 (2011–2013). X.Y. gratefully acknowledges the financial support from the Joint Education Program between Tohoku University and Tsinghua University, and National Natural Science Foundation of China (Grant No. 51471094 ). Publisher Copyright: © 2015 Acta Materialia Inc.

PY - 2015/6/1

Y1 - 2015/6/1

N2 - The overall kinetics and carbon enrichment in austenite during the incomplete isothermal bainite transformation in Fe-0.1C-1.5Mn-(0, 0.03, 0.3, 0.5, 1)Mo (mass%) alloys were investigated with quantitative metallography and Electron Probe Microanalysis in the transformation temperature range of 773-873 K. The incomplete transformation appears at 823-873 K when Mo addition exceeds 0.3 mass%; at 773 K substantial carbide precipitation accompanies bainite transformation and no transformation stasis is observed. Transformed fractions in the stasis stage are hardly affected by prior austenite grain size. Carbon concentrations in austenite in the stasis stage are lower than T0 line and decrease with the increase of Mo addition and temperature. T0′ limit, solute drag and WBs limit theories are used to examine the experimentally measured carbon concentration limits in austenite, and their respective flaws are pointed out.

AB - The overall kinetics and carbon enrichment in austenite during the incomplete isothermal bainite transformation in Fe-0.1C-1.5Mn-(0, 0.03, 0.3, 0.5, 1)Mo (mass%) alloys were investigated with quantitative metallography and Electron Probe Microanalysis in the transformation temperature range of 773-873 K. The incomplete transformation appears at 823-873 K when Mo addition exceeds 0.3 mass%; at 773 K substantial carbide precipitation accompanies bainite transformation and no transformation stasis is observed. Transformed fractions in the stasis stage are hardly affected by prior austenite grain size. Carbon concentrations in austenite in the stasis stage are lower than T0 line and decrease with the increase of Mo addition and temperature. T0′ limit, solute drag and WBs limit theories are used to examine the experimentally measured carbon concentration limits in austenite, and their respective flaws are pointed out.

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Direct measurement of carbon enrichment in the incomplete bainite transformation in Mo added low carbon steels

Abstract

Keywords

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