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| Effect of rare earth Ce on microstructure and properties of super wear-resistant steel with in-situ TiC particles |
| WANG Xiao-lei1, DENG Xiang-tao1, FU Tian-liang1, WANG Qi1, CAO Yi2, WANG Zhao-dong1 |
1. The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China;
2. Liaoning Key Laboratory of Optimization and Utilization of Non-associated Low-grade Iron Ore in Benxi, Liaoning Institute of Science and Technology, Benxi 117004, Liaoning, China |
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Abstract As a new research field in wear-resistant steel,the addition of high volume percent of TiC particles could improve the wear resistance of super wear-resistant steel,but it would reduce the toughness and plasticity of the material. In order to improve the comprehensive mechanical properties of super wear-resistant steel,the effect of rare earth Ce on the microstructure and properties of super wear-resistant steel was investigated. A vacuum induction melting furnace was used to produce the experimental steels with different mass percent of Ce. Using scanning electron microscopy (SEM),electron back scattered diffraction (EBSD),emission electron probe microscopic analyzer (EPMA),hardness testing,low-temperature impact testing and wear resistance testing to study the influence of rare earth Ce on the precipitation behavior of TiC particles,microstructure,mechanical properties and wear resistance of experimental steels. The results indicated that the microstructure of the experimental steel was tempered martensite after heat treatment,some TiC and TiN particles in experimental steel were modified into micron sized Ce2O2S-TiC,Ce2O2S-TiN,CeP-TiC and xCeP·yCe2O3-TiC composite inclusions after adding Ce. With the increasing of the mass percent of Ce,the low-temperature impact toughness and wear resistance first increase and then decrease,but the strength and hardness have little change. When the mass percent of Ce was 0.002 5%,the optimum comprehensive properties can be obtained,and the relative wear resistance was 1.27 times of the experimental steel without Ce addition.
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Received: 19 January 2021
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2021, Vol. 56 
