【摘要】：目的探究一種可以顯著提高65Mn彈簧鋼耐磨性能的工藝,以滿足其在高磨損環(huán)境下的使用性能要求。方法通過正交試驗對65Mn進行QPQ處理,利用金相組織觀察、SEM掃描及能譜分析、磨粒磨損等手段,探究不同氮碳共滲溫度、共滲時間、氧化溫度和氧化時間對試樣顯微組織結(jié)構(gòu)及耐磨性能的影響,優(yōu)化出常規(guī)QPQ和深層QPQ處理方案。結(jié)果經(jīng)過QPQ處理的試樣,滲層組織由外向內(nèi)為氧化物層、疏松層、化合物層和擴散層。經(jīng)深層QPQ處理的試樣,在化合物層和擴散層中間有一層含氮奧氏體層。氧化物層的主要物相是Fe_3O_4,化合物層的主要物相是Fe_3N。QPQ處理后的試樣經(jīng)面掃描后,C、N、O元素分布有一定規(guī)律,其中C元素集中分布在試樣表面,N元素主要集中在致密化合物層,O元素主要集中在樣品表層和疏松空洞之中。結(jié)論深層QPQ工藝為640℃共滲2 h、350℃氧化40 min時,試樣氧化層厚度達到15μm,化合物層厚30μm,奧氏體層厚10μm。深層QPQ處理后的65Mn的耐磨性能優(yōu)異,磨損率達到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，

本文編號：2403029