In situ investigation of structure and stability of niobium carbonitrides in an austenitic heat-resistant steel

Zhang, X. F.; Terasaki, H. and Komizo, Y. (2012). In situ investigation of structure and stability of niobium carbonitrides in an austenitic heat-resistant steel. Scripta Materialia, 67(2) pp. 201–204.

DOI: https://doi.org/10.1016/j.scriptamat.2012.04.019

Abstract

The structure and stability of Nb(C,N) precipitates were direct observed during reheating of an austenitic heat-resistant steel using in situ hybrid observations. The coarsened δ-Nb(C,N) and finer ε-Nb(C,N) were present in as-received steel. During the coarsening process, the d-spacing of cubic δ-Nb(C,N) exhibits a sharp decrease with increasing temperature, while that of hexagonal ε-Nb(C,N) maintains a steady increase. Compared to δ-Nb(C,N), the ε-Nb(C,N) was quickly dissolved into the austenite during heating, and it would no longer reprecipitate in the subsequent cooling.

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