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本文研究了低碳钢自行车轴碗在渗碳化学热处理中同时渗入稀土元素后对共渗动力学过程、金相组织和性能的影响。ESCA谱线分析表明,稀土元素镧、铈确实渗入钢表层;层深测定证实了稀土元素对渗碳过程有明显的活化催渗作用,加稀土比未加稀土的渗层深度在本试验条件下最大可增加近一倍;此外,稀土元素的渗入还使钢表层的马氏体细化,碳化物形貌、尺寸和分布改善,渗层浓度变化较为平缓以及微合金化作用,所有这些均有利于渗层性能的提高。
In this paper, the effects of simultaneous infiltration of rare earth elements into carburizing chemical heat treatment on the co-infiltration kinetics, microstructure and properties of low carbon steel bicycle axles were studied. ESCA spectral analysis showed that rare earth elements lanthanum and cerium do infiltrate into the steel surface layer. The depth measurement confirmed that the rare earth elements obviously activated carburizing process. The depth of infiltrated layer with and without rare earth added under the experimental conditions The maximum can be increased nearly doubled; In addition, the infiltration of rare earth elements also make the steel surface martensite refinement, carbide morphology, size and distribution of the improvement of the diffusion layer thickness changes are more gentle and micro-alloying, all of which have Conducive to the improvement of permeability performance.