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In Situ Observation of the Evolution of Intragranular Acicular Ferrite at Ce‐Containing Inclusions in 16Mn Steel
Author(s) -
Bin Wen,
Bo Song
Publication year - 2012
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201100266
Subject(s) - materials science , nucleation , acicular ferrite , austenite , in situ , acicular , ferrite (magnet) , atmospheric temperature range , metallurgy , confocal laser scanning microscopy , analytical chemistry (journal) , composite material , microstructure , bainite , chemistry , thermodynamics , physics , organic chemistry , medicine , chromatography , biomedical engineering
The effects of chemical compositions and austenitizing temperature on the formation of intragranular acicular ferrite (IAF) of 16Mn steel were systematically investigated, and the in situ observation of the evolution of IAF at Ce‐containing inclusions was carried out using a high‐temperature laser scanning confocal microscopy. The results show that trace amount of Ce can induce the IAF nucleation, while the optimum content of Ce is around 0.02 wt%. The appropriate austenitizing temperature is around 1200°C and the optimal prior austenite grain size is about 120 µm. The temperature range for IAF transformation is around between 557 and 623°C, and the time for which is about 13 s. The disregistries between Ce‐containing inclusions and α‐Fe are so small that may act as highly effective nuclei of IAF.