Carbon enrichment during ferrite transformation in Fe-Si-C alloys. (1st May 2018)

• Record Type: Journal Article
• Authors: Wu, H.-D.; Miyamoto, G.; Yang, Z.-G.; Zhang, C.; Chen, H.; Furuhara, T.
• Is Part Of: Acta materialia. Volume 149(2018)
• Page Start: 68
• Page End: 77
• Publication Date: 2018-05-01
• Subjects: Pro-eutectoid ferrite -- Carbon enrichment -- NPLE limit -- Interface mobility -- Si containing steels -- EPMA; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2018.02.040
• Languages: English
• ISSNs: 1359-6454

Abstract

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. Graphical abstract: Image 1