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一、前言稀土极大地提高电热合金的寿命,早已为人们所广泛了解,但关于稀土在高温金属材料领域应用的巨大汘力,却並非是所有的冶金工作者都很熟悉的。考虑到改善抗氧化性是稀土提高电热合金寿命的主要原因,而许多耐热钢和高温合金与电热合金有相似的成分和氧化行为,所以稀土至少能通过改善抗氧化性在高温金属材料领域得到广泛应用。此外,稀土还能提高材料的高温强度、抗热腐蚀性、加工性和减少晶粒长大的倾向。近年来,科学技术的迅速发展对高温材料提出了越来越高的要求,促使稀土在这一领域中的应用突破了电热合金的范围,在耐热钢中获得了广泛应用,在许多类型的高温合金中也得到了实际应用。
First, the preface greatly improve the life of rare earth heating alloy, has long been widely understood, but the rare earth in the field of high temperature metal material application of great power, but not all metallurgical workers are familiar with. Considering that improving the oxidation resistance is the main reason why the rare earth increases the life of the electrothermal alloy and many heat-resistant steels and superalloys have similar composition and oxidation behavior to the electrothermal alloy, the rare earth can be obtained at least by improving the oxidation resistance in the field of high-temperature metallic materials widely used. In addition, rare earth can also improve the material’s high temperature strength, hot corrosion resistance, processability and reduce the tendency of grain growth. In recent years, the rapid development of science and technology has put forward higher and higher requirements for high-temperature materials, prompting the application of rare earth in this area has broken through the range of electric heat-alloy, has been widely used in heat-resisting steel, in many types Superalloys have also been the practical application.