高温轴承钢中析出相的表征

发布时间：2018-06-09 23:50

本文选题：高温轴承钢 + 时效　；参考：《冶金分析》2017年08期

【摘要】：高温轴承钢的性能,在很大程度上取决于钢中各种相的数量、组成和大小,轴承钢经过等温热处理,通常会形成碳化物相、金属间相等析出相。为了研究不同热处理条件下高温轴承钢中析出相的析出行为,实验选择了合适的电解条件,利用电解萃取方法将析出相从基体中分离。实验采用X射线衍射(XRD)和扫描电镜(SEM)研究了提取后析出相的结构及形貌,用化学湿法和电感耦合等离子体光谱仪对析出相的分离与定量成分检测进行研究。研究结果表明:电解萃取温度对χ相萃取量影响明显,χ相在含氧化剂的弱酸中不溶,在50%(V/V)H_2SO_4中溶解。随着时效时间的增加,M_6C相明显增加,χ相减少。M_6C相呈颗粒状,粒径细小,χ相呈块状,颗粒粗大。
[Abstract]:The properties of high temperature bearing steel depend to a great extent on the number, composition and size of various phases in the steel. After isothermal heat treatment, the bearing steel usually forms carbide phase and the same precipitated phase between metals. In order to study the precipitation behavior of precipitated phase in high temperature bearing steel under different heat treatment conditions, the proper electrolytic conditions were selected and the precipitated phase was separated from the matrix by electrolytic extraction method. The structure and morphology of the precipitated phase were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The separation and quantitative composition of the precipitated phase were studied by chemical wet method and inductively coupled plasma spectrometer. The results show that the temperature of electrolytic extraction has an obvious effect on the amount of 蠂 phase extraction, 蠂 phase is insoluble in weak acid containing oxidant, and dissolved in 50 V / V / V / V / V / V / V / V / V / V / s / 2SO _ 4 / S _ 2SO _ 4. With the increase of aging time, the phase of M _ 6C was obviously increased, 蠂 _ (phase) decreased. M _ (6C) phase was granular, the particle size was small, 蠂 _ (phase) was block, and the grain was coarse.
【作者单位】：钢铁研究总院;
【分类号】：TG142.1

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