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Answer 1

铸钢中加入稀土可以提高铸钢的强度、韧性和疲劳强度等性能。本试验通过向30CrMnSi加入稀土Ce，分别运用渗透法，金相观察，电镜扫描和能谱分析研究不同稀土添加量（0.00%，0.03%，0.06%，0.09%，0.12%）对裂纹，金相组织，夹杂物分布和成分的影响。使铸钢轻量化，结构减薄，并达到提高强度，减少铸造过程的缺陷（裂纹，缩孔）等目的。研究表明，稀土添加量为0.06%对铸钢有减少裂纹，细化晶粒，减少并细化夹杂物等作用。

In rare earth can improve join cast of cast steel strength, toughness and fatigue strength of performance. This test to 30 CrMnSi joined by rare earth Ce, respectively, using the method of metallographic observation, observed by scanning electron microscope (sem and energy spectrum analysis research different adding amount of rare earth (0.00%, 0.03%, 0.06%, 0.09%, 0.12%) of crack, metallographic organization, inclusion distribution and composition of the influence. Make cast steel lightweight, structure, and to enhance the thinning intensity, reduce casting process of defects (cracks, porosity) and so on purpose. Studies show that adding amount of rare earth 0.06% cast steel is to reduce cracks, refined grain, reduce and refined inclusion role.