一、前言近年来国内外在稀土元素对铜铁性能影响这一问题方面有过不少的研究工作,发现微量稀土元素对钢铁的力学性能有着极其复杂的影响,但是由于工艺上和实验上的差别,得到的结果并不完全相同,这种影响的根本原因也还待深入研究。过去我们曾研究了稀土元素对高铬钢的影响,发现一些显著的现象。为了进一步了解稀土在钢中的作用,首先是稀土单独与铁的作用如何?当存在第三种组元的时候这种 I. Introduction In recent years, there have been many researches on the effect of rare earth elements on the properties of copper and iron at home and abroad. It is found that trace rare earth elements have an extremely complicated influence on the mechanical properties of steel. However, due to the technical and experimental Differences, the results obtained are not exactly the same, the root causes of this impact also needs further study. In the past we have studied the impact of rare earth elements on the high-chromium steel and found some notable phenomena. In order to further understand the role of rare earth in steel, the first is the role of rare earth and iron? When there is a third component of this