王津,洪悦,陈兴岩,伍翠兰

• 1:湖南大学材料科学与工程学院

摘要(Abstract)：

从热力学和扩散理论上探究了低碳钢气体渗氮氮化势对渗氮化合物层的影响。采用光学显微镜、扫描电镜、X射线衍射仪、电子探针、显微硬度计和电化学分析仪对渗氮层进行表征。结果表明:气体渗氮气氛中的氮化势对化合物层的影响规律随渗氮温度的改变有所不同。当渗氮温度不高于550℃时,高氮化势显著增加化合物层厚度;当渗氮温度不低于580℃时,尽管低氮化势延迟化合物层的形成,但化合物层一旦形成就快速增厚,且其厚度达到甚至超过高氮化势下化合物层的厚度。高氮化势渗氮化合物层中N浓度随深度降低,其最外层N浓度高达10 mass%;低氮化势渗氮化合物层中N浓度分布均匀,大约为5 mass%~6 mass%。高氮化势渗氮化合物层的耐蚀性较好,韧性和致密性较差。低氮化势渗氮化合物层缺陷较少,韧性较高。

关键词(KeyWords)： 气体渗氮;氮化势;化合物层;扩散相变;性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51071064,51371081)

作者(Author): 王津,洪悦,陈兴岩,伍翠兰

DOI: 10.13289/j.issn.1009-6264.2016.08.029

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