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真空条件下,向低碳微合金钢中加入不同含量的稀土元素钇,同样条件下进行熔炼、浇注、轧制。利用光学显微镜和扫描电镜以及能谱分析,研究了稀土元素钇对低碳微合金钢组织、性能的影响规律。结果表明,稀土元素钇细化了低碳微合金钢的组织并对第二相具有变质作用;热分析表明不同含量钇均使低碳微合金钢的晶粒得到细化。向低碳微合金钢中添加质量分数为1.5%Y时,实验钢的性能有所提高。当达到2.0%Y时,合金晶粒细化效果明显,此时力学性能有进一步改善。
Vacuum conditions, the low carbon microalloyed steel by adding different levels of rare earth elements yttrium, the same conditions for melting, casting, rolling. The effects of rare earth element yttrium on microstructure and properties of low carbon microalloyed steel were studied by means of optical microscope, scanning electron microscope and energy spectrum analysis. The results showed that the rare earth element yttrium refined the microstructure of the low carbon microalloyed steel and had the metamorphism of the second phase. The thermal analysis showed that the yttrium with different contents all refined the grains of the low carbon microalloyed steel. When the mass fraction of 1.5% Y is added to the low-carbon micro-alloyed steel, the performance of the experimental steel is improved. When reaching 2.0% Y, the alloy grain refinement effect is obvious, then the mechanical properties to further improve.