摘要
采用双辉等离子渗铬技术,对T8钢进行了900 ℃温度表面渗铬合金化;使用GDA750,测量了试样渗铬合金层中Fe、Cr和C等元素的浓度分布。通过热力学分析计算,研究了渗铬合金化层形成过程中碳迁移机理和规律。指出驱动碳迁移的动力是碳的活度梯度,并推导出富碳区碳质量分数随铬质量分数变化的数学关系式:w(C)=0.8+0.3536w(Cr)。计算结果与试验结果相当吻合。
Surface chromizing at 900 ℃ of T8 steel was studied using double glow plasma alloying process. The distributions of Fe,Cr and C concentration were measured. The mechanism and behaviour of carbon migration in substrate during chromizing were analyzed. The results showed that the gradient of activity of carbon are is the driving force of carbon migration. The mathematical relation between contents of carbon and chromium in rich carbon section can be expressed as w(C)=0.8+0.3536w(Cr). The calculated results were in accordance with the experimental data.
出处
《中国表面工程》
EI
CAS
CSCD
2004年第4期38-41,共4页
China Surface Engineering
基金
国家自然科学基金项目(50374050)
太原理工大学青年基金(12901002)
关键词
热力学分析
表面合金化
碳迁移
thermodynamic analysis
surface alloying
carbon migration
