期刊
ACTA MATERIALIA
卷 57, 期 2, 页码 533-543出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2008.09.040
关键词
TRIP steels; Polyphase microstructure; Metastable phases; Martensitic phase transformation; Synchrotron radiation
We have performed in situ synchrotron X-ray diffraction experiments to assess the influence or aluminum and phosphorus on the austenite stability in low-alloyed transformation-induced plasticity steels during the high-temperature bainitic holding and the subsequent martensitic transformation during cooling to temperatures between room temperature and 100 K. Although the addition of aluminium increases the chemical driving force for the formation of bainitic ferrite plates significantly, the phosphorus exerts a larger influence on the bainitic transformation kinetics. Consequently, the addition of phosphorus leads to a higher degree of carbon enrichment and a narrower grain volume distribution of the metastable austenite. The stability of the individual austenite grains with respect to their martensitic transformation depends on both the local carbon content and the grain volume for austenite grains smaller than 20 mu m(3). The presence of aluminium and phosphorus further stabilizes the austenite grains. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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