论文部分内容阅读
研究了淬火处理对45钢表面硼铬稀土低温共渗的影响,淬火处理保温时间分别为20、30和40 min,共渗工艺分别为600℃×6 h和650℃×6 h。利用电子扫描电镜观察共渗层形貌特征,利用电子显微硬度计测定共渗层的显微硬度。结果表明,经淬火处理的试样共渗层厚度明显增加,不具有明显的梳齿状,组织致密均匀;共渗温度为600℃时,共渗层厚度随淬火处理过程中保温时间延长先增加后减小,分别增加了45.5%、72.7%、18.2%;共渗温度为650℃时,共渗层厚度具有同样变化趋势,分别增加了50%、62.5%、18.8%;淬火处理试样与未淬火处理试样共渗层的硬度分布趋势一致,从最外层开始,先增大后减小。
The effects of quenching on the low temperature co-infiltration of rare earth boro-chrome on 45 steel were studied. The holding time of quenching was 20, 30 and 40 min, respectively. The infiltration process was 600 ℃ × 6 h and 650 ℃ × 6 h, respectively. The morphology of co-diffusion layer was observed by SEM, and the microhardness of co-diffusion layer was measured by electron microhardness tester. The results show that the total thickness of the quenched sample obviously increases without obvious comb-teeth and the microstructure is dense and uniform. When the co-permeation temperature is 600 ℃, the co-diffusion layer thickness increases with the increase of holding time during quenching And then decreased by 45.5%, 72.7% and 18.2% respectively. When the co-infiltration temperature was 650 ℃, the thickness of co-infiltrated layer had the same trend of increasing by 50%, 62.5% and 18.8% The hardness distribution of the samples that are not quenched is consistent with the distribution of the hardness. From the outermost layer, the hardness increases firstly and then decreases.