铈-硫易切削钢平衡析出相热力学计算与分析

doi:10.13251/j.issn.0254-6051.2022.09.045

摘要/Abstract

摘要： 采用Thermo-Calc热力学软件对铈-硫易切削钢300~1500 ℃范围内的析出相进行了热力学计算,并得到了平衡凝固相变路径图。此外,还讨论了Ce、S含量对Ce₂O₂S平衡相的影响和S、Mn含量对MnS平衡相的影响。结果表明,铈-硫易切削钢中平衡析出相主要有Ferrite、Ce₂O₂S、Corundum、Austenite、M₂(C,N)、Liquid、M₂₃C₆、MnS、Sigma、Spinel与M(C,N);随着Ce含量增加,Ce₂O₂S的析出量逐渐增加,但是S含量变化对Ce₂O₂S相的析出几乎没有影响;随着S含量增加,MnS平衡相的析出量逐渐增加,析出温度也逐渐增高,Mn含量变化对MnS相的析出量几乎没有影响,但Mn含量增加会使MnS析出温度升高;铈-硫易切削不锈钢铸坯中的硫化物呈球形、椭球形、纺锤形或短棒状并以簇状沿晶界分布,属于第Ⅱ类硫化物;通过添加稀土Ce,铈-硫易切削钢中球形稀土复合夹杂物所占比例较高,长宽比≤3的硫化物占比达到84.86%,硫化物的形态控制取得了较好的效果。

关键词: Thermo-Calc软件, 硫化物, 铈-硫易切削钢, 析出相, 热力学计算

Abstract: Equilibrium precipitates in a Ce-S containing free-cutting steel at temperature from 300 ℃ to 1500 ℃ were calculated based on thermodynamic software Thermo-Calc and a diagram of the phase-transformation path was obtained during equilibrium solidification. The effects of Ce and S content on Ce₂O₂S phase and effects of S and Mn content on MnS phase were discussed, respectively. The results show that the main equilibrium phases in the Ce-S containing free-cutting steel are Ferrite, Ce₂O₂S, Corundum, Austenite, M₂(C,N), Liquid, M₂₃C₆, MnS, Sigma, Spinel and M(C,N). With the increase of Ce content, the precipitation of Ce₂O₂S increases gradually, but the change of S content almost has no effect on the Ce₂O₂S. With the increase of S content, the precipitation amount and precipitation temperature of MnS gradually increase. The change of Mn content almost has no effect on the precipitation amount of MnS, but increasing Mn content increases the precipitation temperature of MnS. The sulfides in the Ce-S containing free-cutting stainless steel casting billet are of spherical, ellipsoidal, spindle shape or short-bar-like, and are distributed in clusters along the grain boundary, belonging to a type of II sulfide. By adding the rare earth Ce, the proportion of spherical rare earth composite inclusions in the Ce-S containing free-cutting steel is relatively high, and the proportion of sulfides with length-width ratio≤3 reaches 84.86%, and the sulfide morphology control achieves good results.

Key words: Thermo-Calc software, sulfide, Ce-S containing free-cutting steel, precipitate, thermodynamic calculation

中图分类号:

TG142.71

王英虎. 铈-硫易切削钢平衡析出相热力学计算与分析[J]. 金属热处理, 2022, 47(9): 264-271.

Wang Yinghu. Thermodynamic calculation and analysis on equilibrium precipitates in Ce-S containing free-cutting steel[J]. Heat Treatment of Metals, 2022, 47(9): 264-271.

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