中南大学学报（自然科学版）2016，Vol.47Issue(5)：1506-1512,7.DOI:10.11817/j.issn.1672-7207.2016.05.008
直流电场对35钢盐浴渗氮的影响与动力学分析
Effect of direct current field on salt bath nitrding for 35 steel and kinetics analysis
摘要
Abstract
Direct current field (DCF) assisted salt bath nitrding technology was developed,using35 steel as the testing material. This technology was carried out by applying appropriate parameters of DCF between the treated samples in the nitrding salt bath. Characterization of modified surface layers was made by means of optical microscopy, Vickers micro-hardness test and X-ray diffraction analysis. The results show that DCF can significantly reduce the holding duration compared with the conventional process.When nitrding at 848 K with 7.5 V of DCF assisting, the time to get the same thickness of compound layer decreasesto less than half by DCF assisting, while the higher surface hardness, modestly higher sub-surface hardness and superior hardness profile were obtained.The results showthat the diffusion coefficient of nitrogen enhanced by DCF increasesto more than 1.9 times higher than that of NM at each temperature. In addition, activation energy (Q) for the nitrogen diffusion decreasesfrom 220 to 181kJ/mol. Moreover, the catalyzing mechanism of DCF for salt bath nitriding process was analyzed.关键词
盐浴渗氮/直流电场/动力学/扩散Key words
salt bath nitridng/direct current field/kinetics/diffusion分类
矿业与冶金引用本文复制引用
陈尧,周正寿,孙斐,戴明阳,胡静..直流电场对35钢盐浴渗氮的影响与动力学分析[J].中南大学学报（自然科学版）,2016,47(5):1506-1512,7.基金项目
江苏高校优势学科建设工程项目(2014006)；江苏省研究生创新基金资助项目(SCZ100431322)(Project(2014006) supported by PAPD of Jiangsu Higher Education Institutions （2014006）
Project(SCZ100431322)supported by Jiangsu Province Graduate Student Innovation Fund) （SCZ100431322）
