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首页> 外文期刊>ISIJ international >Microstructure Control of Steels through Dispersoid Metallurgy Using Novel Grain Refining Alloys
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Microstructure Control of Steels through Dispersoid Metallurgy Using Novel Grain Refining Alloys

机译：新型晶粒细化合金通过弥散冶金控制钢的组织

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This paper describes how small inclusions (designated dispersoids) can be used to control the microstruc-ture of steels. The term "dispersoids" refers to oxides, sulphides, nitrides and carbides which are in the 1 mum size range and capable of promoting grain refinement during solidification by a process of epitaxial nu-cleation or in the solid state through intragranular nucleation of ferrite. Such particles are sufficiently small to be harmless from a toughness point of view, but at the same time large enough to act as potent nucleation sites during phase transformation. The dispersoids can either be created by balanced additions of strong oxide and sulphide forming elements to an impure steel melt or be added directly into the liquid steel through a specially designed master alloy containing the nucleating particles. In both cases it is possible to manipulate the steel microstructure in a positive direction, but the latter method, involving the use of a master alloy, has probably a wider industrial application. The direction of the research now being undertaken at NTNU/SINTEF to make the grain refining alloys commercially available is briefly described towards the end of the paper.
机译：本文介绍了如何使用小的夹杂物（指定的弥散体）来控制钢的微观结构。术语“弥散体”是指氧化物，硫化物，氮化物和碳化物，其在1μm的尺寸范围内，并且能够通过外延成核过程或在固态下通过铁素体的晶内成核而促进晶粒细化。从韧性的观点来看，这些颗粒足够小以至于无害，但同时又足够大以在相变过程中充当有效的成核位点。可以通过在不纯的钢液中平衡添加强氧化物和硫化物形成元素来生成弥散体，也可以通过专门设计的包含成核颗粒的中间合金将其直接添加到液态钢中。在这两种情况下，都可以沿正方向操纵钢的微观结构，但是后一种方法（涉及使用中间合金）可能具有更广泛的工业应用。 NTNU / SINTEF目前正在开展的研究方向以使晶粒细化合金商品化，在本文末尾已作了简要说明。

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