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在具有实用意义的Fe-Si(≤8wt-％)系中,碳含量在万分之几范围内的变化,足以显著改变α,γ单相区和α+γ等双相区的存在范围,硅钢生产工艺参数均依据相图。至于借脱碳以发展柱状晶的特殊热处理工艺,更离不开相图的指引。所以长期来曾对Fe-Si-C三元系中各相界进行了大量的实验研究。但到目前为止,文献中尚缺少有关此成分范围的较详细而精确的相图可借鉴。为此,我们绘制了Fe-Si(≤8wt-％)-C(≤0.1wt-％)局部三元三维相图。同时介绍,借发展柱状晶特殊热处理工艺来校核γ和γ+α存在温区的有效方法。最后,在附录中分别给出一系列等硅和等碳赝二元剖面,相应的成分间隔各为1wt-％Si和0.02wt-％C。
In practically useful Fe-Si (≤8wt-%) systems, the variation of carbon content within a few tenths of a full range is sufficient to significantly alter the existence of the dual-phase region such as α, γ single phase and α + γ, Production process parameters are based on phase diagram. As for the use of decarbonization to develop a special columnar heat treatment process, but also inseparable from the phase diagram of the guidelines. So for a long time had a lot of experimental study of the phase boundary in the Fe-Si-C ternary system. However, up to now, there is still a lack of more detailed and accurate phase diagrams on the scope of this component in the literature. For this reason, we plotted a ternary ternary phase diagram of Fe-Si (≤8 wt -%) - C (≤0.1 wt-%). At the same time, by the development of columnar crystal special heat treatment process to check the existence of γ and γ + α temperature effective method. Finally, a series of iso-silicon and isocarbon pseudo-binary sections are given in the appendix, with respective component intervals of 1 wt-% Si and 0.02 wt-% C, respectively.