Microstructural and Erosive Wear Characteristics of a High Chromium Cast Iron

A. Fortini, A. Suman, Alessandro Vulpio, M. Merlin, M. Pinelli
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引用次数: 8

Abstract

Surface material loss due to erosive wear is responsible for the increased cost of maintenance and downtime in industries. Hence, hardfacing is one of the most valuable and effective techniques employed to improve the wear resistance of heavy-duty components. The present paper investigates the microstructural and erosive wear characteristics of a hypereutectic high-chromium cast iron, considering the erosion resistance, resulting from the impact of micro-sized particles, of both as-received and heat-treated conditions. Micro-sized particles involve the erosion-resistant characteristics of carbide and matrix, contemporary. Due to this, the enhancement of the matrix strength could improve the mechanical support to withstand cracking deformation and spalling. Accordingly, the effect of a destabilization heat treatment on the microstructure was firstly investigated by hardness tests, X-ray diffraction analyses, optical and scanning electron microscopy. Specifically designed erosive tests were carried out using a raw meal powder at an impingement angle of 90°. The resulting superior wear resistance of the heat-treated samples was relayed on the improved matrix microstructure: consistent with the observed eroded surfaces, the reduced matrix/carbides hardness difference of the heat-treated material is pivotal in enhancing the erosion resistance of the hardfacing. The present results contribute to a better understanding of the microstructure–property relationships concerning the erosive wear resistance.
高铬铸铁的显微组织和冲蚀磨损特性
由于侵蚀磨损导致的表面材料损失是工业维护和停机成本增加的原因。因此,堆焊是提高重型部件耐磨性的最有价值和最有效的技术之一。本文研究了一种过共晶高铬铸铁的显微组织和冲蚀磨损特性,并考虑了在接收和热处理条件下微尺寸颗粒的冲击所产生的抗冲蚀性。微型颗粒涉及到碳化物和基体的抗侵蚀特性,当代。因此,提高基体强度可以提高机械支架的抗开裂变形和剥落能力。因此,首先通过硬度测试、x射线衍射分析、光学显微镜和扫描电镜研究了失稳热处理对微观组织的影响。特别设计的冲蚀试验采用生粉,冲蚀角为90°。热处理样品的优异耐磨性体现在基体微观组织的改善上:与观察到的侵蚀表面一致,热处理材料的基体/碳化物硬度差的减小是增强堆焊抗侵蚀性能的关键。本研究结果有助于更好地理解与耐蚀磨损有关的微观组织-性能关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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