Microstructure and Mechanical Properties of Low Alloy Ultra-High Strength Steel Microalloyed with Cerium
Microstructure and Mechanical Properties of Low Alloy Ultra-High Strength Steel Microalloyed with Cerium
复制标题
铈微合金化低合金超高强度钢的显微组织与力学性能
DOI：
10.4028/www.scientific.net/kem.871.53
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发表时间：
2021-01
期刊：
影响因子：
--
通讯作者：
R.D.K. Misra
中科院分区：
文献类型：
--
作者：
Yue Yue Jiang;Zhao Dong Wang;Xiang Tao Deng;R.D.K. Misra
研究了稀土元素Ce对低合金超高强度钢组织和性能的影响。测试了含0.0367%Ce和不含Ce的钢的强度、塑性和冲击韧性。利用扫描电子显微镜(SEM)、能谱分析(EDS)和背散射电子衍射(EBSD)研究了Ce对合金组织和力学性能的影响机理。结果表明，Ce的加入提高了低合金超高强度钢的综合力学性能。尤其是塑性和韧性有了明显的改善。Ce的加入使合金的延伸率从9.47%提高到10.49%，低温冲击功从50J提高到58J。延伸率和冲击功分别提高了10.77%和16%。所有样品的屈服强度均保持在1400 Mpa以上。稀土元素Ce不改变基体成分相，为马氏体相。而Ce的加入使高角度晶界的比例从33.2%增加到40.2%。此外，Ce还使夹杂物变性，从而获得尺寸较小的球状夹杂物。能谱分析结果表明，稀土和有害元素P、O形成夹杂物，对钢水起到净化作用，阻碍了大尺寸复合夹杂物的形成。
This study aims to investigate the influences of rare earth element cerium (Ce) on microstructure and mechanical properties of low alloy ultra-high strength steel. The strength, plasticity, and impact toughness of steels with 0.0367% Ce and without Ce were tested. The influence mechanism of Ce on the microstructure and mechanical properties were investigated by scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS) and electron back scattered diffraction (EBSD). The results showed that the addition of Ce improved the comprehensive mechanical properties of low alloy ultra-high strength steel. In particular, the plasticity and toughness were improved obviously. The addition of Ce increased the elongation from 9.47% to 10.49%, and the low-temperature impact energy from 50J to 58J. The elongation and impact energy increased by 10.77% and 16%, respectively. And the yield strength of all samples remained above 1400 MPa. The rare earth element Ce did not change the matrix composition phase which were martensite. However, the addition of Ce increased the proportion of high-angle grain boundary from 33.2% to 40.2%. In addition, the Ce make the inclusions denatured and hence spherical inclusion with small size can be obtained. The EDS results showed that rare earth and harmful elements P and O formed inclusions, which as a purifier for the molten steel and hindered the formation of the large-size composite inclusions.
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发表时间：
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影响因子：
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