Fe-C—Sb合金中液态急冷获得的ε相的分解

DECOMPOSITION OF THE ε-PHASE OBTAINED BY MEANS OF SPLAT QUENCHING IN THE Fe-C-Sb ALLOY

本工作用示差热分析法,淬火样品X射线衍射法和Guinier-Lenn透射式高温单色聚焦粉末照相法研究了Fe-C-Sb合金中液态急冷获得的ε相的高温分解过程,实验结果指出,ε相在125℃开始分解,首先分解成ε-Fe_2C,而后在450℃分解成α-Fe,并析出Sb和Fe_3Sb_2,还保留有ε-Fe_2C;在550℃以后ε-Fe_2C转变成Fe_3C,并在770℃时发生Fe的α→γ转变,在800℃时主要组成相为:γFe,Sb,Fe_3C(Fe_3Sb分解);在冷却过程中750℃发生Fe的γ→α转变,冷至室温时的主要组成相是:αFe,Fe_3C,Sb,Fe_3Sb_2。

This work investigates the high temperature decomposition process of theε-phase obtained by means of splat quenching in the Fe-C-Sb alloy by using differential thermal analysis, quenching sample X-ray diffraction analysis and powder photography employing Guinier-Lenne transmission high temperature monochromatic focusing camera. The results indicate that the ε-phase begins to decompose at 125℃. At first, it decomposes into ε-Fe2C, then α-Fe, Sb and Fe3Sb2 appear at 450℃, butε-Fe2 Cremains at that temperature. Above 550℃, the ε-Fe2C phase transforms into Fe3C. The transformation of the α-Fe→γ-Fe was found to be at 770℃, and at 800℃ the main phases are:γ-Fe, Sb and Fe3C. The transformation of the γ-Fe→α-Fe was found to take place at 750℃during the cooling. The main phases at room temperature are:α -Fe, Fe3C, Sb and Fe3Sb2.