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Rare earth elements and their alloys, including what the role of the wear plate
2018/6/1 13:46:36

Rare earth elements and their alloys, including what the role of the wear-resistant steel
Types of rare earth alloy element in the periodic table are rare earth lanthanides, the atomic number 57-71. Usually includes a very similar chemical properties of yttrium (Y), scandium (Sc) of 17 rare earth elements. Where La (lanthanum), Ce (cerium), Pr (praseodymium), Nd (neodymium) summarized these four light rare earth elements. The other 13 elements grouped into heavy rare earths. Rare generic chemical symbol Re (Rare Earth).
The role of rare earth alloy elements added in molten steel earth, occur as a metallurgical process behavior are summarized for the purification of molten steel, such as deoxidation, desulfurization, to remove a gas steel (H2, N2) component tends to be uniform and to reduce dendritic segregation, improving metal inclusion morphology, size, distribution, and to grain refinement. Therefore, after adding rare earth steel, inclusions can change shape (spherical>, the inclusions become smaller and dispersed in the crystal, due to the addition of rare earth shape of sulfide inclusions, size, distribution improvement helps metallurgy improve the quality of many performance benefit.
Prayer grains on rare earth alloy also has a significant impact, the study found, the addition of rare earth can refine the grain, inhibit the development of columnar zone, or even eliminate the columnar zone. Rare grain refinement for the following reasons: surface active rare earth element, reducing the surface tension of liquid steel, hinder grain growth; rare inclusions can be used as non-spontaneous nucleation, the nucleation promoting grain refinement; RE solid hydrogen role in removing the tiny hydrogen bubbles as a leader columnar grain growth phase, hindering the growth of columnar crystals.


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