Cr结构钢渗硼动力学的研究  

Research on the Boronization Dynamics of Cr Structure Steel

作　　者：周旸[1] 

机构地区：[1]南京理工大学材料科学与工程学院,江苏南京210094

出　　处：《机械设计与制造工程》2013年第11期79-83,共5页Machine Design and Manufacturing Engineering

摘　　要：为获得理想的钢铁材料渗硼工艺参数,对影响渗硼层性能的主要因素进行了对比试验。用固体渗硼技术对40Cr、40CrNi和45Cr钢分别在850℃,880℃,910℃和940℃保温条件下进行3,5,7,9个小时的渗硼处理,首先用光学显微镜观察3种钢在不同加热温度和保温时间下各种钢渗硼层的形貌和显微组织,发现渗层以齿状楔入机体。随后通过测量3种钢在不同温度下不同渗硼层深度的硬度,发现硬度峰值在1 444HV0.1到1 490HV0.1之间。最后通过对40Cr、40CrNi和45Cr钢进行渗硼动力学计算与分析,得出渗硼层厚度与渗硼时间呈抛物线关系、生长速率常数随着渗硼温度升高而增加的规律;并且随着含碳量和合金元素的增加,渗硼所需的扩散激活能随之增大。n this study, the 40Cr,40CrNi and 45Cr steels substrates were pack -borided at 850, 880, 910and 940℃for 3, 5, 7, and 9 h.The morphology formed on the surface of steel substrates were confirmed by optical microscopy analysis .The characteristic sawtooth morphology of the boride layer is dominant .Boride layer thick-ness formed on the borided steels depending on process temperature , treatment time and element contents of the substrates.Also, we measure the microhardness of borides of different carbon -contents steels, and the peak mi-crohardness is in the range from 1444HV0.1 to 1490HV0.1.After calculating the layer growth kinetics, it dem-onstrates a parabolic relationship between layer thickness and process time and the growth rate constant K increa -ses with boriding temperature .Also, the activation energy for the process increases with the amount of element contents of the substrate .

关 键 词：碳钢 CR元素 固体渗硼 渗硼层 动力学 扩散激活能 

分 类 号：TG142.33[一般工业技术—材料科学与工程]