微量Ce对65Mn钢微观组织和力学性能的影响

发布时间：2018-02-04 09:45

本文关键词： Mn钢微量Ce 夹杂物变性非均质形核细晶化　出处：《钢铁钒钛》2015年06期 　论文类型：期刊论文

【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+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。
[Abstract]:65mn steel samples with different trace ce were prepared by vacuum induction furnace. The effect of trace ce on the microstructure and mechanical properties of steel was studied by means of XRD and mechanical properties. The results show that the effect of trace ce on the microstructure and mechanical properties of steel is increased with the increase of trace ce. The cleanliness of liquid steel is improved; The long strip MnS in the steel becomes an ellipsoid or spherical MnS Ce_3S_4 inclusion below 2 渭 m. The oxidized inclusion of 11 渭 m changed from irregular to spherical oxide Ce_2O_2S Ce_2O_3 below 2 渭 m. The grain size (pearlite) decreased from 21.65 渭 m to 13.74 渭 m, and the interlamellar spacing of pearlite decreased from 264 nm to 116.77 nm. The mechanical properties of steel increased in direct proportion with the increase of ce. When the ce content was 0.004 6, the Rp0.2 MPa RmA and 伪 k values of steel reached 714.38 MPa, respectively. 864.70 MPa1 22.75% and 37J.
【作者单位】：太原理工大学材料科学与工程学院;新材料界面科学与工程教育部重点实验室;
【基金】：国家自然科学基金(No.51371122) 钢铁冶金新技术国家重点实验室基金(No.KF13-06)
【分类号】：TF76;TG142.1
【正文快照】： 原030024)0引言65Mn钢强度高、淬透性好、脱碳倾向小和切削加工性好,常用于弹簧、发条、刀具及高耐磨性(如磨床主轴、弹簧卡头等)零部件的制造,广泛用于工程机械和交通运输等行业。在使用中它出现断裂、开裂、起皮和力学性能不达标等问题[1-3],主要因为钢材中有较大尺寸的非金

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