Revealing the role of micron-sized in situ TiC particles on tensile properties and fracture mechanism of martensitic wear-resistant steel at elevated temperature
Revealing the role of micron-sized in situ TiC particles on tensile properties and fracture mechanism of martensitic wear-resistant steel at elevated temperature
复制标题
揭示微米级原位TiC颗粒对马氏体耐磨钢高温拉伸性能和断裂机制的作用
DOI：
10.1016/j.msea.2021.142503
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Zhaodong Wang
中科院分区：
文献类型：
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作者：
Chengru Li;Xiaolin Li;Xiangtao Deng;Zhaodong Wang
为了提高TiC陶瓷增强耐磨钢在中高温下的性能，如渣土输送、水泥生产等，需要对其高温拉伸性能有深入的了解。本文制备了TiC颗粒体积分数为1%的纳米TiC陶瓷颗粒增强耐磨钢。研究了TiC陶瓷增强钢在25~600℃下的拉伸行为和断裂机制。研究了微米级TiC颗粒对高温拉伸性能和断裂机制的影响。结果表明，TiC陶瓷增强耐磨钢的高温强度随着基体热稳定性的提高而提高。在中低温区(25~500℃)，微米级TiC陶瓷颗粒对强度有一定的提高作用，但对断裂伸长率影响不大。然而，当温度超过500℃时，微米尺寸的TiC陶瓷颗粒大大降低了试验钢的断裂伸长率。在25-600℃范围内，断裂机制符合典型的延性断裂。但在500℃时，空洞的形成机制不同。在25~500℃时，微孔的形成主要是由于尺寸在1~9μm的微米级TiC颗粒的断裂和基质中的缺陷所致。在500℃以上，微米级TiC与基体之间的界面脱粘是裂纹萌生的主要方式。
In order to improve the performance of the TiC ceramic reinforced wear-resistant steel at medium and high temperatures, such as slag transportation and cement production, its high-temperature tensile properties need to be well understood. In this paper, anin situmicron-sized TiC ceramic particle reinforced wear-resistant steel with 1 vol% TiC particles was fabricated. The tensile behavior and fracture mechanism of the TiC ceramic reinforced steel at 25–600 °C were investigated. The role of micron-sized TiC particles on tensile properties and fracture mechanism at elevated temperature was studied. Results indicated that the high temperature strength of TiC ceramic reinforced wear-resistant steel was enhanced by improving the thermal stability of the matrix. In the low and medium temperature range (25–500 °C), micron-sized TiC ceramic particles played a role in improving the strength, but had little effect on the elongation to failure. However, the micron-sized TiC ceramic particles greatly reduced the elongation to failure of the experimental steel when the temperature exceeded 500 °C. In the range of 25–600 °C, the fracture mechanism matched the typical ductile fracture. However, the mechanism of cavity formation varied at 500 °C. At 25–500 °C, the micro-cavities mainly formed due to fracture of the micron-sized TiC particles with sizes in the range of 1–9 μm and defects of the matrix. Above 500 °C, the interfacial debonding between the micron-sized TiC and the matrix was the main mode of crack initiation.