Carbon enrichment during ferrite transformation in Fe-Si-C alloys

H. D. Wu; G. Miyamoto; Z. G. Yang; C. Zhang; H. Chen; T. Furuhara

doi:10.1016/j.actamat.2018.02.040

Carbon enrichment during ferrite transformation in Fe-Si-C alloys

H. D. Wu, G. Miyamoto, Z. G. Yang, C. Zhang, H. Chen, T. Furuhara

Materials Design Division

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

16 Citations (Scopus)

Abstract

The microstructure evolution, transformation kinetics and especially the C enrichment during isothermal ferrite transformation at 800, 750, 700 °C for Fe-(1.5, 3.0) mass%Si-0.4mass%C alloys were investigated in the present study. Both transformation kinetics and C enrichment in austenite (γ) at grain boundary ferrite (GBF)/γ interfaces suggest that negligible partitioning local equilibrium (NPLE) mode operates during non-partitioned ferrite growth under the conditions investigated. Deviations of C enrichment in γ at Widmanstatten ferrite (WF)/γ interfaces from NPLE limit at early stages were observed. These deviations are deduced to be resulted from intrinsic interface mobility rather than solute drag effect. In addition, mobility of WF/γ interfaces is found to be lower than that for incoherent GBF/γ interfaces reported in literature.

Original language	English
Pages (from-to)	68-77
Number of pages	10
Journal	Acta Materialia
Volume	149
DOIs	https://doi.org/10.1016/j.actamat.2018.02.040
Publication status	Published - 2018 May 1

Keywords

Carbon enrichment
EPMA
Interface mobility
NPLE limit
Pro-eutectoid ferrite
Si containing steels

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.2018.02.040

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title = "Carbon enrichment during ferrite transformation in Fe-Si-C alloys",

abstract = "The microstructure evolution, transformation kinetics and especially the C enrichment during isothermal ferrite transformation at 800, 750, 700 °C for Fe-(1.5, 3.0) mass%Si-0.4mass%C alloys were investigated in the present study. Both transformation kinetics and C enrichment in austenite (γ) at grain boundary ferrite (GBF)/γ interfaces suggest that negligible partitioning local equilibrium (NPLE) mode operates during non-partitioned ferrite growth under the conditions investigated. Deviations of C enrichment in γ at Widmanstatten ferrite (WF)/γ interfaces from NPLE limit at early stages were observed. These deviations are deduced to be resulted from intrinsic interface mobility rather than solute drag effect. In addition, mobility of WF/γ interfaces is found to be lower than that for incoherent GBF/γ interfaces reported in literature.",

keywords = "Carbon enrichment, EPMA, Interface mobility, NPLE limit, Pro-eutectoid ferrite, Si containing steels",

author = "Wu, {H. D.} and G. Miyamoto and Yang, {Z. G.} and C. Zhang and H. Chen and T. Furuhara",

note = "Funding Information: H.-D. Wu gratefully acknowledge 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} 2018 Acta Materialia Inc.",

year = "2018",

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doi = "10.1016/j.actamat.2018.02.040",

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T1 - Carbon enrichment during ferrite transformation in Fe-Si-C alloys

AU - Wu, H. D.

AU - Miyamoto, G.

AU - Yang, Z. G.

AU - Zhang, C.

AU - Chen, H.

AU - Furuhara, T.

N1 - Funding Information: H.-D. Wu gratefully acknowledge 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: © 2018 Acta Materialia Inc.

PY - 2018/5/1

Y1 - 2018/5/1

N2 - The microstructure evolution, transformation kinetics and especially the C enrichment during isothermal ferrite transformation at 800, 750, 700 °C for Fe-(1.5, 3.0) mass%Si-0.4mass%C alloys were investigated in the present study. Both transformation kinetics and C enrichment in austenite (γ) at grain boundary ferrite (GBF)/γ interfaces suggest that negligible partitioning local equilibrium (NPLE) mode operates during non-partitioned ferrite growth under the conditions investigated. Deviations of C enrichment in γ at Widmanstatten ferrite (WF)/γ interfaces from NPLE limit at early stages were observed. These deviations are deduced to be resulted from intrinsic interface mobility rather than solute drag effect. In addition, mobility of WF/γ interfaces is found to be lower than that for incoherent GBF/γ interfaces reported in literature.

AB - The microstructure evolution, transformation kinetics and especially the C enrichment during isothermal ferrite transformation at 800, 750, 700 °C for Fe-(1.5, 3.0) mass%Si-0.4mass%C alloys were investigated in the present study. Both transformation kinetics and C enrichment in austenite (γ) at grain boundary ferrite (GBF)/γ interfaces suggest that negligible partitioning local equilibrium (NPLE) mode operates during non-partitioned ferrite growth under the conditions investigated. Deviations of C enrichment in γ at Widmanstatten ferrite (WF)/γ interfaces from NPLE limit at early stages were observed. These deviations are deduced to be resulted from intrinsic interface mobility rather than solute drag effect. In addition, mobility of WF/γ interfaces is found to be lower than that for incoherent GBF/γ interfaces reported in literature.

KW - Carbon enrichment

KW - EPMA

KW - Interface mobility

KW - NPLE limit

KW - Pro-eutectoid ferrite

KW - Si containing steels

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JO - Acta Materialia

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Carbon enrichment during ferrite transformation in Fe-Si-C alloys

Abstract

Keywords

ASJC Scopus subject areas

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