Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5361095 | Applied Surface Science | 2008 | 4 Pages |
Abstract
The isothermal decomposition characteristic of the homogeneous high nitrogen austenitic samples prepared by a new multi-stage nitriding process was investigated by SEM and TEM in this paper. Lamellar-structure precipitations arranged on the decomposed austenite grain boundaries (GBs) and the flaky γⲠparticles and network-structure precipitations appeared inside of the γ matrix. The extra high Vickers hardness more than 800 HV was found in the 5-h aged samples, which was different from those of the bainitic/martensitic structures in Fe-C alloys. The SAED analysis indicates the γⲠhas the coherent relation with the parent γ-Fe[N] phase and the interstitial nitrogen atoms are inclined to aggregate on {1 1 0}γâ²/γ planes, which also contributes to the hardness of the matrix.
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Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Zhijun Jiang, Xiaoling Li, Jianfeng Gu, Mingjuan Hu, Zuchang Zhu,