Abstract
The fine structure and interface structure of ion-nitrided layers in 35CrMo steel treated by ion-nitriding at 550°C for 6 h were studied with a transmission electron microscope (TEM) and a high resolution transmission electron microscope (HRTEM). The results showed that the phase γ′(Fe4N) is a compact structure of equi-axis fine grains. The outermost layer of ion-nitriding is phase ε and γ′, which are arranged in alternating, ribbon-like strips. There are abundant vacancy, dislocation, twin and stacking fault defects. Nitrogen atoms in γ′(Fe4N) are distributed orderly. The interface between phase ε and phase γ′ is smooth and straight and coherent. Their orientation relationships are\((1\bar 11)_{\gamma '} //(0001)\), and\([110]_{\gamma '} //[11\bar 20]_ \in \). Not only the structure ledges of monoatom layer, but also those of multiatom layer were found on the interface of phase ε and phase γ′. The existence of a number of crystal defects is the main reason why bombing of ions can accelerate the nitriding process.
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Project supported by the Natural Science Foundation of Shandong Province.
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Li, F., Sun, D., Ao, Q. et al. Fine structure and interface structure of ion-bombardment nitrided layers. Sci. China Ser. E-Technol. Sci. 41, 579–585 (1998). https://doi.org/10.1007/BF02917040
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DOI: https://doi.org/10.1007/BF02917040