铈对低合金超高强钢马氏体相变行为的影响

蒋月月; 王昭东; 邓想涛

doi:10.13228/j.boyuan.issn0449-749x.20190431

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钢铁 ›› 2020, Vol. 55 ›› Issue (6) : 84-90. DOI: 10.13228/j.boyuan.issn0449-749x.20190431

钢铁材料

铈对低合金超高强钢马氏体相变行为的影响

蒋月月^1,2, 王昭东¹, 邓想涛¹

作者信息 +

Effect of trace rare earth Ce on martensitic transformation behavior of ultra-high strength low alloy steel

蒋月月^1,2, 王昭东¹, 邓想涛¹

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摘要

为了研究稀土元素铈对低合金超高强钢马氏体相变组织及动力学过程的影响,制备了不含铈与铈质量分数为0.079 2%的两组对比试验用钢。采用OM、SEM和TEM分析了试验用钢的显微组织,并利用DIL805A淬火膨胀仪绘制了马氏体相变动力学曲线。研究结果表明,铈的添加细化了原奥氏体晶粒,平均晶粒尺寸由7.63减小到6.42 μm;细小的奥氏体晶粒使马氏体板条宽度得到细化,平均宽度由250减少到211 nm。此外,对于马氏体相变动力学,铈的添加使马氏体相变开始温度(M_s)由391降低到380 ℃;在马氏体相变前中期,铈阻碍了马氏体转变,在马氏体相变后期,铈促进了马氏体转变。

Abstract

In order to study the effect of rare earth element Ce on the martensite transformation structure and dynamics process of ultra-high strength low alloy steel,two test steels containing 0 and 0.079 2% Ce were prepared. The microstructure of the experimental steels were analyzed by OM,SEM and TEM,and the phase transformation kinetics curve of martensite was drawn by DIL805A quenching dilatometer. The results showed that the addition of Ce refined the prior austenite grains,and the average grain size decreased from 7.63 to 6.42 μm. Moreover,the addition of Ce diminished the average width of martensite laths from 250 to 211 nm;The addition of Ce lowered the martensite transformation start temperature (M_s) from 391 to 380 ℃;Martensitic transformation was hindered in the early stage and promoted in the later stage.

关键词

稀土元素铈 / 低合金超高强钢 / 马氏体相变 / 组织 / 动力学

Key words

rare earth element Ce / ultra-high strength low alloy steel / martensitic transformation / microstructure / kinetics

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蒋月月, 王昭东, 邓想涛. 铈对低合金超高强钢马氏体相变行为的影响[J]. 钢铁, 2020, 55(6): 84-90 https://doi.org/10.13228/j.boyuan.issn0449-749x.20190431

JIANG Yue-yue, WANG Zhao-dong, DENG Xiang-tao. Effect of trace rare earth Ce on martensitic transformation behavior of ultra-high strength low alloy steel[J]. Iron and Steel, 2020, 55(6): 84-90 https://doi.org/10.13228/j.boyuan.issn0449-749x.20190431

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