T8钢液相等离子体电解渗碳的扩散过程和光谱学分析*

doi:10.11901/1005.3093.2015.349

材料研究学报

2016, Vol. 30

Issue (9): 655-661 DOI: 10.11901/1005.3093.2015.349

研究论文

本期目录 | 过刊浏览

T8钢液相等离子体电解渗碳的扩散过程和光谱学分析*

吴杰^1,²,张亦凡^1,²,金小越^1,²,杨璇^1,²,琳陈^1,²,薛文斌^1,²

Diffusion Coefficient and Spectroscopy Analysis during Plasma Electrolytic Carburizing on T8 Carbon Steel

Jie WU^1,²,Yifan ZHANG^1,²,Xiaoyue JIN^1,²,Xuan YANG^1,²,Lin CHEN^1,²,Wenbin XUE^1,^2,^*

1. Key Laboratory for Beam Technology and Materials Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
2. Beijing Radiation Center, Beijing 100875, China

引用本文:

吴杰,张亦凡,金小越,杨璇,琳陈,薛文斌. T8钢液相等离子体电解渗碳的扩散过程和光谱学分析*[J]. 材料研究学报, 2016, 30(9): 655-661.
Jie WU, Yifan ZHANG, Xiaoyue JIN, Xuan YANG, Lin CHEN, Wenbin XUE. Diffusion Coefficient and Spectroscopy Analysis during Plasma Electrolytic Carburizing on T8 Carbon Steel[J]. Chinese Journal of Materials Research, 2016, 30(9): 655-661.

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摘要:

采用阴极液相等离子体电解渗技术实现了T8碳钢表面的快速渗碳。测量了样品内部温度与外加电压的关系, 并评估了在不同电压下碳在钢中的扩散过程和等离子体放电的光谱特征。结果表明, T8碳钢在甘油水溶液中经1min渗碳处理后可得到20-30 μm厚的硬化层。在外加电压为360 V电压、样品表面温度约为650℃的条件下, 碳的扩散系数为6.7×10^-8 cm²s^-1; 在外加电压为380 V、样品表面温度约800℃的条件下, 碳的扩散系数为1.5×10^-7 cm²s^-1。气膜放电击穿产生的等离子体处于局部热平衡状态, 电子温度为5000-12000 K。等离子体区的瞬时高温为有机物的分解和碳的快速扩散提供了有利条件, 碳的扩散系数比同温度下传统固体渗碳提高了一个数量级, 扩散激活能也明显降低。

关键词 ：等离子体电解渗碳, 扩散系数, 发射光谱, 电子温度

Abstract：

Fast carburization of T8 carbon steel was carried out by plasma electrolytic carburizing (PEC) method in glycerol aqueous solution. The dependence of temperature on the applied voltage for the steel sample was measured with a thermocouple, and the influence of the applied voltage on the diffusion process of carbon and the optical emission spectral features of the plasma discharge was investigated. It was found that a hardening layer of 20-30 μm thick formed after 1min discharge in glycerol aqueous solution; by applied voltage 360 V, the surface temperature of the steel was about 650℃and the diffusion coefficient of carbon was about 6.7×10^-8 cm²s^-1; while by applied voltage 380 V, the surface temperature of the steel and the diffusion coefficient of carbon were about 800℃ and1.5×10^-7 cm²s^-1, respectively. In addition, the discharge plasma within the gaseous envelope by the above two voltages was in local thermal equilibrium (LTE) state with temperatures in the range of 5000-12000 K. The transient high temperature promotes the decomposition of electrolyte and the diffusion of carbon. In comparison with the conventionbal pack cementation process at the same temperature, the diffusion coefficient of carbon was enhanced by an order of magnitude with an obviously reduced activation energy for the PEC process.

Key words： plasma electrolytic carburizing diffusion coefficient optical emission spectroscopy electron temperature

收稿日期: 2015-11-20

基金资助:* 国家自然科学基金51071031和51671032, 高等学校博士学科点专项科研基金20120003110010资助项目

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https://www.cjmr.org/CN/10.11901/1005.3093.2015.349 或 https://www.cjmr.org/CN/Y2016/V30/I9/655

图1 等离子体电解渗碳的实验装置图

图2 距样品表面0.5 mm处的钢内部温度随电压的变化关系

图3 在360 V放电1 min后的样品表面和截面图

图4 在380 V放电1 min后的样品表面和截面图

图5 在不同温度等离子体电解渗碳样品截面的碳浓度分布曲线

图6 扩散方程的解析解与实验测量的碳含量分布曲线的对比图

图7 等离子体电解渗碳过程中T8钢样品内部不同位置的温度

表1 两条Fe II谱线的波长, 跃迁方式, 上能级的统计权重, 激发能和跃迁概率

图8 T8钢表面等离子体电解渗碳的光发射总谱

图9 等离子体放电区的电子浓度随放电时间的变化

图10 等离子体放电区的电子温度随放电时间的变化

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