Powder Nitrocarburizing at Low Temperatures
(0) A low temperature powder nitrocarburizing technology was developed by applying appropriate direct current field (DCF) between the treated sample and the powder agents, which overcomes the shortage of energy consuming and low-efficiency in the conventional powder nitrocarburizing process. The cross-sectional microstructures and the depth of the bright layers were investigated, and the micro-hardness distribution along the depth of the layer was measured. The results showed that DCF could produce the temperature gradient between the sample and the powder agents, and thus increase the concentration of the active nitrogen and carbon-containing species and accelerate their diffusion rate. With the effect of DCF, the depth of bright layer was increased 2～5 times for 45 steel when the furnace temperature was the same as that in conventional process for test temperatures of 300℃～500℃, and the micro- hardness distribution of the diffusion layer was improved for 20 CrMnMo.
powder nitrocarburizing direct current field micro-hardness coatings heat treatment
PAN Xian-bo ZHOU Zheng-hua XIE Fei HU Jing
School of Materials science and Engineering,Jiangsu Polytechnic University,Changzhou,China
国际会议
The Fourth Asian Conference on Heat Treatment and Surface Engineering(第四届亚洲热处理及表面工程大会)
北京
英文
387-390
2009-10-27（万方平台首次上网日期，不代表论文的发表时间）