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Mechanism for Z-phase formation in 11CrMoVNbN martensitic heat-resistant steel

Author:
Myung-Yeon Kim  Sung-Min Hong  Kyu-Ho Lee  Woo-Sang Jung  Young-Su Lee  Young-Kook Lee  Jae-Hyeok Shim  


Journal:
Materials Characterization


Issue Date:
2017


Abstract(summary):

Abstract The mechanism for the formation of Z-phase was investigated for samples of an 11CrMoVNbN steel aged at 593 °C for up to 50,000 h. X-ray diffraction indicates that Z-phase appears after 5000 h of aging, and its amount gradually increases up to 50,000 h aging at the expense of mainly Cr 2 N. Transmission electron microscopy shows that Z-phase nucleates in the V-enriched rim region of Cr 2 N precipitates, which forms due to the diffusion of V into the precipitates from the matrix. Nucleated Z-phase tends to grow relatively rapidly compared with the preexisting precipitates such as Nb(C,N) and M 23 C 6 . Z-phase seems to consume Cr 2 N by the nucleation and growth mechanism rather than the transformation mechanism. The main difference in the aged samples is that the Nb content of Z-phase is lower and that Z-phase does not replace Cr 2 N completely, compared to the results of the crept samples. Graphical abstract Image 1 Highlights • Precipitation is studied for a martensitic steel aged at 593 °C for up to 50,000 h. • Z-phase nucleates in the V-enriched rim region of Cr 2 N precipitates after 5000 h. • Z-phase seems to consume Cr 2 N by the nucleation and growth mechanism.


Page:
40-40


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