摘要
用高压直流辉光放电等离子方法对316LSS进行渗氮处理,研究了氮化温度对渗层的组织和性能的影响。利用XRD衍射仪、光学显微镜、表面显微硬度计和带能谱仪(EDS)的扫描电镜(SEM)分别分析渗氮层的相组成、厚度和显微结构、表面硬度、N和Cr原子的浓度。结果表明:当氮化温度350℃≤T≤400℃时,氮化层为单一的S相;温度为480℃时,S相衍射峰消失,仅剩CrN相;氮化后获得约为5～9μm的渗层;渗层深度和表面显微硬度随着温度的升高而增加。用环块式的方法评价磨损性能的结果表明:不锈钢表面的耐磨性提高一倍以上;未氮化的不锈钢主要存在粘着磨损、氧化磨损和磨粒磨损;等离子氮化的主要存在氧化磨损。
By applying the different high-voltage DC plasma glow-discharge nitriding （DCPN） temperatures, the microstructure and wear resistance of the surface-nitrided 316L stainless steel were investigated. The phase composition, thickness, micro-hardness and element profile were examined by X-ray diffractometer, Optical microscopy, Hardness tester and EDS （Energy dispersive spectrometer）, respectively. The results showed that a homogenous layer S-phase was produced between 350℃and 400℃ and a single layer CrN at 480℃. The nitrided layer depth was approximately 5-9μm. Both the thickness and the surface-hardness of the nitrided layer increased with the temperature increasing. It also revealed that the wear resistance of the DCPN stainless steel can be improved by one times or more. Wear of the untreated 316L was severe and characterized by strong adhesion, wear, whilst wear of the DCPN-treated 316L was mild and dominated by oxidation wear.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2007年第5期54-58,共5页
Nuclear Power Engineering
