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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+Ce_3S_4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+Ce_2O_2S+Ce_2O_3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。
The microstructure and mechanical properties of the steel were studied by using the experimental data of composition, OM, SEM, EDS, XRD and mechanical properties. The results show that with the increase of the amount of Ce, the cleanliness of the molten steel increases. The long strip MnS in the steel becomes ellipsoidal or spheroidal MnS + Ce3S4 inclusions with a size of 2μm or less. The 11μm oxide inclusions change from irregular to 2μm or less spherical spheroids + Ce 2 O 2 S + Ce 2 O 3 inclusions; the grain size (pearlite) decreased from 21.65μm to 13.74μm, and the spacing of pearlite grains decreased from 264 nm to 116.77 nm; the mechanical properties of steel also varied with Ce Increase and increase in direct proportion. When Ce content is 0.004 6%, the Rp0.2, Rm, A and αk values of steel reach 714.38 MPa, 864.70 MPa, 22.75% and 37 J respectively.