Abstract Ce, Zr and Ce–Zr composite experimentl steel were prepared by vacuum induction furnace and 550 twin-roll reversible rolling mill. Optical microscope (OM), scanning electronic microscopy (SEM) and energy dispersive spectrometer (EDS) were used to observe the rolling microstructure of the experimental steel. The mechanical properties of the experimental steel were tested and analyzed. The effect of cerium zirconium oxide inclusions on nucleation, tensile and impact fracture mechanism of intragranular acicular ferrite (IAF) was investigated. The results show that the rolling microstructure of steel containing 0.0052% Ce and the steel under composite treatment containing 0.0053% Ce and 0.0055% Zr is refined. IAF generation can be induced by Al–Ce–O inclusion of the size of 4 µm or induced by Al–Ce–Zr–O + MnS inclusion of the size of 3 µm. The yield strength and tensile strength of the steel treated by Ce–Zr are 428 and 590 MPa, respectively, the elongation is 23.55%, the longitudinal impact energy at −60°C is 189 J, which are 31, 45, 46 J and 6.25%, respectively, higher than those of the matrix steel. The dimple of the experimental steel at the fracture surface is larger and deeper than that of the matrix steel. The small inclusions in uniform distribution contribute to the high tensile strength of the experimental steel.

中文翻译：

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M(M=Ce,Zr,Ce-Zr)对FH40轧制组织和力学性能的影响

摘要 采用真空感应炉和550双辊可逆轧机制备了Ce、Zr和Ce-Zr复合实验钢。采用光学显微镜(OM)、扫描电子显微镜(SEM)和能谱仪(EDS)观察实验钢的轧制组织。对试验钢的力学性能进行了测试和分析。研究了铈锆氧化物夹杂物对晶内针状铁素体（IAF）形核、拉伸和冲击断裂机理的影响。结果表明，含0.0052%Ce钢和含0.0053%Ce和0.0055%Zr复合处理钢的轧制组织得到细化。IAF 的产生可以由 4 µm 尺寸的 Al-Ce-O 夹杂物诱导或由 3 µm 尺寸的 Al-Ce-Zr-O + MnS 夹杂物诱导。Ce-Zr处理钢的屈服强度和抗拉强度分别为428和590 MPa，延伸率为23.55%，-60℃纵向冲击功为189 J，分别为31、45、46 J和分别比基体钢高6.25%。实验钢断口处的凹坑比基体钢的凹坑更大更深。均匀分布的小夹杂物有助于实验钢的高抗拉强度。实验钢断口处的凹坑比基体钢的凹坑更大更深。均匀分布的小夹杂物有助于实验钢的高抗拉强度。实验钢断口处的凹坑比基体钢的凹坑更大更深。均匀分布的小夹杂物有助于实验钢的高抗拉强度。