电解提取—Rietveld全谱分析法定量分析双相不锈钢中的析出相

Quantitative precipitation analysis using the electrolysis extraction—Rietveld all-phase spectrum analysis method for duplex stainless steel

通常,用透射电镜和扫描电镜只能对析出相进行定性分析而无法进行定量,而传统的X衍射定量分析钢中每种析出相是相当困难的。近几年,随着物理化学相分析的发展,经过化学分离或选择性电解,一些不同的相可以被分离从而进行定量测定,因此,电解提取—化学分离—湿法检测的物理化学法可以用来定量表征某些钢中特定的析出相。但是,在双相不锈钢中,σ相和χ相是紧密结合,无法通过化学分离法进行准确定量。介绍了定量测定双相钢中σ相、χ相、碳化物和氮化物的电解提取—Rietveld全谱分析法。试验证明,该法可以快速得到准确的定量数据;结果还表明,χ相是σ相的过渡相,随着热处理时间的延长,σ相越来越多,相对应χ相越来越少。

Transmission electron microscopy and scanning electron microscopy are generally used to perform qualitative rather than quantitative analysis. It is also difficult to quantitatively determine the mass fraction of each type of precipitates in steels by means of traditional X-ray powder diffraction analysis methods. With the development of methods for analyzing physical and chemical phases in recent years, some different types of phases can be separated and measured by chemical separation or selective electrolysis. Electrolysis extraction, chemical separation and wet chemical tests can be used in combination to quantitatively analyze certain precipitation phases in steels. However, in duplex stainless steel, the or phase is formed firmly on the basis of the X phase. These two phases cannot be separated and measured accurately through chemical separation. This paper introduced the electrolysis extraction - Rietveld all-phase spectrum analysis method for determining the relative mass fractions of the or phase, χ phase, carbide phase and nitride phase in duplex stainless steel. The results show that the method is effective in obtaining quantitative data accurately and quickly. In addition, it has been found that the X phase is a transition phase of the or phase and that with the prolonging of the aging time, the amount of the or phase increases while the amount of the X phase decreases.