42CrMo钢离子氮碳氧多元共渗及动力学分析  

Plasma oxynitrocarburising of 42CrMo steel and kinetics analysis

作　　者：缪斌[1] 刘晗[1,2] 范琪[2,3] 胡静[1,2,3] 

机构地区：[1]常州大学江苏省表面工程科学与技术重点实验室,江苏常州213164 [2]常州大学江苏省光伏科学与工程协同创新中心,江苏常州213164 [3]常州盛德无缝钢管有限公司,江苏常州213016

出　　处：《材料热处理学报》2016年第8期184-188,共5页Transactions of Materials and Heat Treatment

基　　金：江苏省科技成果转化项目(BA2013078);江苏省研究生创新基金(SCZ100431322)

摘　　要：以42CrMo钢为材料,通过在离子氮碳共渗过程中添加空气进行离子氮碳氧多元共渗。采用扫描电镜、光学显微镜、X射线衍射仪和显微硬度计对渗层形貌、渗层厚度、渗层物相和截面硬度进行分析。研究结果表明,在传统离子氮碳共渗过程中添加适量的空气具有显著的催渗效果,且以空气流量为0.3 L/min的效果最佳,截面硬度也得到大幅度提高。离子氮碳氧多元共渗中氮原子的扩散激活能从传统离子氮碳共渗的56.12 k J/mol降低到25.27 k J/mol。同时,对离子氮碳氧多元共渗的机理进行了分析。Air enhanced plasma oxynitrocarburising of 42 CrMo steel was carried out by adding plain air in plasma nitrocarburizing.The cross-sectional microstructure,nitrided layer thickness,phase microstructure and cross-sectional microhardness of the plasma oxynitrocarburising layer of 42 CrMo steel were investigated by scanning electron microscopy（SEM）,optical microscope（OM）,X-ray diffraction（XRD） and microhardness tester.The results show that the thickness of compound layer remarkablely increases with addition of plain air in plasma nitrocarburizing,the optimal effect of plain air flow is 0.3 L / min,and cross-sectional microhardness is improved notablely as well.Activation energy（Q） of the nitrogen atom diffusion decreases from 56.12 k J / mol in plasma nitrocarburizing to 25.27 kJ/mol for the plasma oxynitrocarburising.The mechanism of plasma oxynitrocarburising is also discussed.

关 键 词：空气 42CRMO钢 离子氮碳氧多元共渗 动力学 

分 类 号：TG156.8[金属学及工艺—热处理]