期刊
ACTA MATERIALIA
卷 53, 期 7, 页码 2069-2079出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2005.01.019
关键词
nitriding; iron alloys; precipitation; hardness; electron probe microanalysis
The nitriding behavior of Fe-4wt%V and Fe-2wt%V alloys was investigated by exposing these alloys to a gas mixture of ammonia and hydrogen at 580 degrees C. The microstructure of the nitrided specimens was analyzed employing light and scanning electron microscopy, hardness measurements, and X-ray diffraction. To determine the elemental composition of the nitrided zone electron probe microanalysis (EPMA) was applied. The nitrided zone of the Fe-4wtl/(,V specimens comprised many grains exhibiting a lamellar morphology characterized by a lamellar spacing of 20-40 nm. Such a lamellar microstructure was absent in the nitrided zone of the Fe-2wt%V specimens. These morphological results, together with the obtained hardness and X-ray diffraction data, demonstrate that a discontinuous coarsening reaction occurs in nitrided Fe-4wt%V alloy. Such a reaction was not observed before for nitrided Fe-V alloys. EPMA showed the uptake of excess nitrogen in the nitrided zone. The discontinuously transformed regions contain less nitrogen than the not transformed regions. The effect of these phenomena on the nitriding kinetics was analyzed and discussed. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据