Abstract

The wear resistance of iron (Fe)-matrix materials could be improved through the in situ formation of vanadium carbide particles (VCp) with high hardness. However, brittleness and low impact toughness limit their application in several industries due to addition of higher carbon content. Carbon-partitioning treatment plays an important role in tuning the microstructure and mechanical properties of in situ VCp-reinforced Fe-matrix composite. In this study, the influences of carbon-partitioning temperatures and times on the microstructure, mechanical properties, and wear resistance of in situ VCp-reinforced Fe-matrix composite were investigated. The experimental results indicated that a certain amount of retained austenite could be stabilized at room temperature through the carbon-partitioning treatment. Microhardness of in situ VCp-reinforced Fematrix composite under carbon-partitioning treatment could be decreased, but impact toughness was improved accordingly when wear resistance was enhanced. In addition, the enhancement of wear resistance could be attributed to transformation-induced plasticity (TRIP) effect, and phase transformation was caused from γ-Fe (face-centered cubic structure, fcc) to α-Fe (body-centered cubic structure, bcc) under a certain load.

中文翻译：

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碳分割处理对原位VCp增强铁基复合材料显微组织，力学性能和耐磨性的影响

摘要

铁（Fe）基材料的耐磨性可以通过原位形成高硬度的碳化钒颗粒（VCp）来提高。但是，由于添加了更高的碳含量，脆性和低冲击韧性限制了它们在多个行业中的应用。碳分配处理在调节原位VCp增强铁基复合材料的微观结构和力学性能方面起着重要作用。在这项研究中，碳分配温度和时间对原位组织，力学性能和耐磨性的影响研究了VCp增强的铁基复合材料。实验结果表明，通过碳分配处理，可以在室温下稳定一定量的残余奥氏体。原位VCp增强的Fematrix复合材料在碳分配处理下的显微硬度可以降低，但当耐磨性增强时，冲击韧性也相应提高。此外，耐磨性的提高可归因于相变诱导可塑性（TRIP）效应，并且相变由γ-Fe（面心立方结构，fcc）转变为α-Fe（体心立方结构，密件抄送）。