把铈含量>95%的稀土金属块分别放置在钟罩式离子渗氮炉内的上层、中层和下层进行催渗试验。结果表明,富铈稀土对38CrMoAl及40CrNiMo钢试样有较明显的催渗作用,同时减少了白亮层厚度;当稀土块放置在炉内上层时,各试样的层深、表面硬度、脉状氮化物及疏松无明显差别;而稀土块放置在渗氮炉中间层和下层时,稀土块下面试样催渗效果较好,稀土块上面的试样催渗效果稍差。 The cerium content of> 95% of the rare earth metal blocks were placed in a bell-type ion nitriding furnace in the upper, middle and lower for catalysis test. The results show that the cerium-rich rare earth has obvious catastrophic effect on the samples of 38CrMoAl and 40CrNiMo steel, and reduces the thickness of the white bright layer. When the rare earth lumps are placed in the upper layer of the furnace, the layer depth, surface hardness, Nitrogen and loose no significant difference; and rare earth blocks placed in the middle layer and the lower layer of nitriding furnace, the samples under the Rare Earth block reminder effect is better, the sample above the rare earth block effect is slightly less.