Journal
TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN
Volume 106, Issue 6, Pages 31-40Publisher
IRON STEEL INST JAPAN KEIDANREN KAIKAN
DOI: 10.2355/tetsutohagane.TETSU-2019-099
Keywords
hardenability; boron; segregation; molybdenum; combined effect; Fe-23(C,B)(6); ToF-SIMS; EBSD; austenite reconstruction
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To understand the effect of Fe-23(C,B)(6) precipitation on hardenability of boron (B) added low carbon steels, we investigated the distribution of B at prior austenite grain boundaries by the advanced analysis using time-of-flight secondary ion mass spectrometry (ToF-SIMS). The Mo-B combined steel which has no precipitation of Fe-23(C,B)(6) showed flat intensity profiles of BO2- ions at prior y grain boundaries, while the B added steel showed the decrease in signal intensities of BO2- ions at the prior y grain boundary between two Fe-23(C,B)(6) precipitates. The results suggested that solute B depleted zone is formed near the precipitates and the Fe-23(C,B)(6) precipitation promotes ferrite transformation not only by assisting itself but also by forming the solute B depleted zone.
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