Effect of Ce Addition on Microstructures and Properties of 65Mn Steel
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摘要: 用真空感应炉制备不同微量Ce的65Mn钢样;用成分、OM、SEM、EDS、XRD和力学性能等试验数据,研究微量Ce对钢材微观组织和力学性能的影响。结果表明,随微量Ce的增加,钢液洁净度提高;钢中长条状Mn S变为2μm以下的椭球形或类球形MnS+Ce3S4夹杂物,11μm的氧化类夹杂物由不规则状变为2μm以下的类球形氧化物+Ce2O2S+Ce2O3夹杂物;晶粒尺寸(珠光体)由21.65μm减小到13.74μm,珠光体片间距由264 nm减小至116.77 nm;钢材力学性能亦随Ce的增加而成正比的提高。当Ce含量为0.004 6%时,钢材的Rp0.2、Rm、A和αk值分别达到714.38 MPa、864.70 MPa、22.75%和37 J。Abstract: The 65 Mn steel with different contents of cerium were prepared by a vacuum induction furnace. Optical microscope,SEM,EDS and XRD were employed to analyze the influence of rare earth element on microstructure and mechanical properties of 65 Mn steel. The results are shown as follows: when the content of Ce is within 0~0.0046 %, the cleanliness of molten steel is greatly improved. Large strip Mn S inclusions are transformed into spherical composite inclusions containing MnS and Ce3S4 complex inclusions with size below 2 μm. The large oxide inclusions of around 11 μm in size with clear edges and irregular shape are transformed into smooth spherical oxide+Ce2O2S+Ce2O3 complex inclusions with size less than 2 μm. The size of pearlites decreases from 21.65 μm to 13.74 μm,the lamellar spacing of pearlites reduces from 264 nm to 116.77 nm. The mechanical properties of the steel is improved with Ce content. When the content of Ce is 0.004 6%,the yield strength,tensile strength,elongation and impact toughness reach to 714.38 MPa,864.70 MPa,22.75% and 37 J respectively.
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Key words:
- 65Mn steel /
- trace element of Ce /
- inclusions modification /
- heterogeneous nucleation /
- fine grain
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