High resolution transmission electron microscopy and molecular simulation analysis of ε-Fe2-3N and γ’-Fe4N formation for a nitrided 4140 steel
DOI:
https://doi.org/10.3989/revmetalm.041Keywords:
HRTEM, Morphology, Nitriding, Phases, SimulationAbstract
High Resolution Transmission Electron Microscopy (HRTEM) and molecular simulation techniques were applied to analyze phase formation in the post-discharge microwave nitriding process of a 4140 steel. The results showed the formation of ε-Fe2-3N and γ’-Fe4N. The morphology of the γ’-Fe4N phase was composed by cubic nanoparticles that grows in the < 0 0 1 > axis direction. Otherwise, the ε-Fe2-3N crystal is associated to hexagonal faces in the [0 0 1] direction which grows forming angles of 120°. The comparison between experimental and analytical results allowed a better understanding of the phases formed during this nitriding process.
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