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

被引：19
作者：
Wu, H. -D. [1 ]
Miyamoto, G. [2 ]
Yang, Z. -G. [1 ]
Zhang, C. [1 ]
Chen, H. [1 ]
Furuhara, T. [2 ]
机构：
[1] Tsinghua Univ, Minist Educ, Key Lab Adv Mat, Sch Mat Sci & Engn, Beijing 100084, Peoples R China
[2] Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
来源：
ACTA MATERIALIA | 2018年 / 149卷
基金：
中国国家自然科学基金;
关键词：
Pro-eutectoid ferrite; Carbon enrichment; NPLE limit; Interface mobility; Si containing steels; EPMA; CONTROLLED PRECIPITATE GROWTH; PHASE-TRANSFORMATION; TERNARY-SYSTEMS; MN ALLOYS; X ALLOYS; AUSTENITE; DIFFUSION; KINETICS; STEELS; IRON;
D O I：
10.1016/j.actamat.2018.02.040
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructure evolution, transformation kinetics and especially the C enrichment during isothermal ferrite transformation at 800, 750, 700 degrees 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 (gamma) at grain boundary ferrite (GBF)/gamma interfaces suggest that negligible partitioning local equilibrium (NPLE) mode operates during non-partitioned ferrite growth under the conditions investigated. Deviations of C enrichment in gamma at Widmanstatten ferrite (WF)/gamma 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/gamma interfaces is found to be lower than that for incoherent GBF/gamma interfaces reported in literature. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：68 / 77
页数：10
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