摘要
为了探究SKD11钢的优化氮碳共渗工艺,对SKD11钢在530℃不同共渗时间、不同炉内气压、NH3/CO2不同气氛比值情况下的离子氮碳共渗进行了研究。运用XRD、SEM、显微硬度、摩擦磨损试验,对材料的显微组织、显微硬度和耐磨性进行了分析。试验结果表明:对于冷作模具钢SKD11,时间为10h、NH3/CO2为10∶1、炉内气压为500～700Pa时,氮碳共渗效果相对最好。另外,在上述优化工艺基础上,随着稀土La的加入,渗层变厚且渗层与基体结合更致密,表层到心部的硬度梯度更小,氮碳共渗效果更好。
To obtain the optimal nitrocarburizing parameters for SKD11 steel, their specimens have been plasma nitrocarburized at 530℃for different times in a mixed gas of NH3 and CO2 with and without rare earth （RE）. The microstructure, microhardness, and wear resistance of surface layers for the treated specimens were characterized using scanning electron microscopy （SEM）, X-ray diffraction （XRD）, and microhardness and wear testers, respectively. Results show that for SKDll, the optimal parameters for plasma nitrocarburi- zing treatment are the time of 10 h, NH3-to-CO2 ratio of 10：1, and air pressure in the furnace of 500-700 Pa. Based on the optimal parameters, when adding lanthanum, the nitrocarburized layer becomes thicker and more compact, the gradient of hardness gets smaller from the surface to the core, and the results of plasma ni- trocarburizing treatment is better.
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2012年第6期15-20,共6页
China Surface Engineering
基金
上海市重点学科建设项目(S30107)
