盐浴氮碳共渗对65Mn弹簧钢耐磨性的影响
发布时间：2019-01-06 16:20
【摘要】：目的探究一种可以显著提高65Mn弹簧钢耐磨性能的工艺,以满足其在高磨损环境下的使用性能要求。方法通过正交试验对65Mn进行QPQ处理,利用金相组织观察、SEM扫描及能谱分析、磨粒磨损等手段,探究不同氮碳共渗温度、共渗时间、氧化温度和氧化时间对试样显微组织结构及耐磨性能的影响,优化出常规QPQ和深层QPQ处理方案。结果经过QPQ处理的试样,渗层组织由外向内为氧化物层、疏松层、化合物层和扩散层。经深层QPQ处理的试样,在化合物层和扩散层中间有一层含氮奥氏体层。氧化物层的主要物相是Fe_3O_4,化合物层的主要物相是Fe_3N。QPQ处理后的试样经面扫描后,C、N、O元素分布有一定规律,其中C元素集中分布在试样表面,N元素主要集中在致密化合物层,O元素主要集中在样品表层和疏松空洞之中。结论深层QPQ工艺为640℃共渗2 h、350℃氧化40 min时,试样氧化层厚度达到15μm,化合物层厚30μm,奥氏体层厚10μm。深层QPQ处理后的65Mn的耐磨性能优异,磨损率达到0.166 mg/m。
[Abstract]:Objective to explore a new method to improve the wear resistance of 65Mn spring steel in order to meet the requirement of high wear environment. Methods 65Mn was treated with QPQ by orthogonal test. By means of metallographic observation, SEM scanning and energy spectrum analysis, abrasive wear and so on, the different temperature and time of nitrocarburizing were investigated. The effects of oxidation temperature and oxidation time on the microstructure and wear resistance of the samples were investigated. The conventional QPQ and deep QPQ treatment schemes were optimized. Results after QPQ treatment, the microstructure of the infiltrating layer was composed of oxide layer, loose layer, compound layer and diffusion layer from outside to inside. There is a nitrogen-bearing austenite layer between the compound layer and the diffusion layer. The main phase of the oxide layer is that of the Fe_3O_4, compound layer. After scanning the samples after Fe_3N.QPQ treatment, the distribution of elements C is regular, and the C element is concentrated on the surface of the sample. The N element is mainly concentrated in the dense compound layer, and the O element is mainly concentrated in the surface layer of the sample and the loose cavity. Conclusion when the deep QPQ process is oxidized at 640 鈩，
本文编号：2403029
[Abstract]:Objective to explore a new method to improve the wear resistance of 65Mn spring steel in order to meet the requirement of high wear environment. Methods 65Mn was treated with QPQ by orthogonal test. By means of metallographic observation, SEM scanning and energy spectrum analysis, abrasive wear and so on, the different temperature and time of nitrocarburizing were investigated. The effects of oxidation temperature and oxidation time on the microstructure and wear resistance of the samples were investigated. The conventional QPQ and deep QPQ treatment schemes were optimized. Results after QPQ treatment, the microstructure of the infiltrating layer was composed of oxide layer, loose layer, compound layer and diffusion layer from outside to inside. There is a nitrogen-bearing austenite layer between the compound layer and the diffusion layer. The main phase of the oxide layer is that of the Fe_3O_4, compound layer. After scanning the samples after Fe_3N.QPQ treatment, the distribution of elements C is regular, and the C element is concentrated on the surface of the sample. The N element is mainly concentrated in the dense compound layer, and the O element is mainly concentrated in the surface layer of the sample and the loose cavity. Conclusion when the deep QPQ process is oxidized at 640 鈩，
本文编号：2403029
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