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采用向防护钢中添加微量Ce元素的方法,研究不同Ce含量对防护钢组织和性能的影响。借助于金相显微镜、扫描电镜、能谱仪和万能拉伸试验机等检测手段,对添加Ce的防护钢的显微组织、夹杂物和力学性能进行了表征和分析。结果表明:防护钢中加入微量Ce可明显改善钢的显微组织,晶粒得到细化;钢液得到净化,钢中的氧硫含量均下降,同时钢中夹杂物得到变性,由原来多边形的Mn S夹杂转变为球状的稀土复合夹杂。钢中Ce含量达到0.084%时,其抗拉强度、屈服强度及延伸率分别比未加Ce的防护钢提高了5.24%,3.41%和43.70%。
Adopt the method of adding trace Ce element to the protective steel to study the effect of different Ce content on the microstructure and properties of the protective steel. The microstructure, inclusions and mechanical properties of Ce-added protective steels were characterized and analyzed by means of optical microscope, scanning electron microscopy, energy dispersive spectrometer and universal tensile testing machine. The results show that the microstructure of the steel can be obviously improved by adding a small amount of Ce and the grains are refined. The molten steel is purified, the content of oxygen and sulfur in the steel is decreased, and the inclusions in the steel are denatured. MnS inclusions into spherical rare earth composite inclusions. When the Ce content in steel reached 0.084%, the tensile strength, yield strength and elongation increased by 5.24%, 3.41% and 43.70% respectively compared with those without Ce.