Direct observation of thermal stability of M₂₃C₆ carbides during reheating using in situ synchrotron X-ray diffraction

Zhang, X. F. and Komizo, Y. (2013). Direct observation of thermal stability of M₂₃C₆ carbides during reheating using in situ synchrotron X-ray diffraction. Philosophical Magazine Letters, 93(1) pp. 9–17.

DOI: https://doi.org/10.1080/09500839.2012.728296

Abstract

Precipitation reactions of heat-resistant steel occurring during welding, both growth and coarsening of existing phases and the formation of new phases, can be detrimental for creep strength. However, understanding of the thermal stability of precipitates during the heat cycle of welding is insufficient. In this study, an attempt has been made to investigate the possibility of analyzing M₂₃C₆ carbides stability occurring in the heat-affected zone based on in situ time-resolved X-ray diffraction using a synchrotron. The d-spacing of M₂₃C₆ carbide exhibits a discontinuous change accompanied by coarsening. Similarly, the volume fraction curve of M₂₃C₆ carbide shows a slight increase before it decreases dramatically as the temperature increases. The mean crystallite size of fine M₂₃C₆ particles can be characterized by the integral breadth method. Compared to as-received state, there are no M₂₃C₆ carbides in the reheated microstructure.

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