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PUBDB-2025-04246

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A Study of the Carbon Distribution in Two Carbide-Free Bainite Alloys

Shalchi-Amirkhiz, B. ; Scott, C.Extern* ; Fazeli, F. ; Danoix, F. ; Geandier, G.Extern* ; Macchi, J.Extern* ; DaCostaTeixeira, J. ; Allain, S.Extern* ; Pushkareva, I.

2023
Association for Iron & Steel Technology

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Please use a persistent id in citations: doi:10.33313/298/022

Abstract: Two low carbon (0.22 wt.%) carbide-free bainite (CFB) alloys were prepared by isothermal transformation at three differenttransformation temperatures. The distribution of carbon in bainitic ferrite (BF), retained austenite (RA) and martensite (M)phases was studied using a combination of in-situ high energy X-ray diffraction (HEXRD), atom probe tomography (APT) andelectron energy loss spectroscopy (EELS). These complementary techniques provided consistent and unambiguous resultsconfirming the presence of significant excess carbon levels in BF. The carbon concentration in BF increases as the isothermaltransformation temperature is decreased. Statistical analysis of the APT and EELS data indicates that the excess carbon contentin bainitic laths does not follow a normal distribution. APT reconstructions suggest that only part of this excess carbon issegregated to defects or clusters. No significant evidence of bainite tetragonality was observed. The addition of vanadium, astrong carbide forming element did not influence the carbon distribution in BF. However, the mean dislocation density in thevanadium alloy was found to be systematically higher than the reference steel.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Helmholtz-Zentrum Hereon (Hereon)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)

Experiment(s):

1. PETRA Beamline P07 (PETRA III)

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