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在甲酰胺溶液中,利用液相感应渗入技术,在35钢表面制备出碳氮共渗层,用金相显微镜、扫描电镜观察了渗层组织和表面形貌,测定了渗层的成分,用显微硬度计测试了渗层硬度分布。结果表明,在合适的工艺条件下得到碳氮共渗层,随着处理时间的延长,渗层的厚度增加,渗层表面孔洞减少。渗层由外白层、内白层和过渡区组成,渗层中含有C、N元素,含量随离表面距离的增加而减小。处理6 min可在试样表面形成厚度约33μm的白亮层和50μm的扩散层,渗层的最大硬度为592 HV0.1。
In formamide solution, liquid infiltration technique was used to prepare carbonitrided layer on the surface of 35 steel. Microstructure and surface morphology of the infiltrated layer were observed by metallographic microscope and scanning electron microscope. Microhardness tester tested the distribution of hardness. The results show that the carbonitrided layer is obtained under the proper process conditions. With the extension of treatment time, the thickness of the layer increases and the pores on the surface of the layer become smaller. The infiltration layer consists of outer white layer, inner white layer and transitional zone. The infiltration layer contains C and N elements, and the content decreases with the increase of the distance from the surface. After 6 min of treatment, a white bright layer with a thickness of about 33 μm and a diffusion layer with a thickness of 50 μm were formed on the surface of the sample. The maximum hardness of the diffusion layer was 592 HV0.1.