This study is to reveal the influence of the amount of carbon content on the microstructure evolution, mechanical properties, and wear properties of Hypereutectic High Chromium Cast Iron (HHCCI). The results indicated that the carbon content plays a key role in the regulation of carbides in the cast iron microstructure. As the amount of carbon content rises, the primary carbides in the cast iron microstructure become apparently coarser, and the volume fraction of carbides gradually increases. The carbide volume fraction reaches 62% when the carbon content is 5wt.%. When the value of the carbon content increases, the accumulation and growth of eutectic carbides in the heat-treated cast iron become more and more obvious. After heat treatment, a large number of secondary carbides will be precipitated from the austenite matrix, in the form of fine particles or short rods, with a dispersed distribution. The macroscopic hardness of HHCCI has increased. When the carbon content is 3.5wt.%, the macroscopic hardness is 61.2 HRC, and when the carbon content becomes 5wt.%, it reaches 64.3 HRC. The wear resistance of HHCCI increases with the value of the carbon content increases. When the carbon content was increased from 3.5wt.% to 5.0wt.%, the wear resistance of the material increased by 85.7%. The wear of HHCCI is mainly adhesive wear and fatigue wear, and the wear morphology is mainly spalling pits and wear debris.

中文翻译：

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碳含量对过共晶高铬铸铁组织演化和性能的影响

本研究旨在揭示含碳量对过共晶高铬铸铁 (HHCCI) 组织演变、力学性能和磨损性能的影响。结果表明，碳含量在铸铁显微组织中碳化物的调控中起关键作用。随着含碳量的增加，铸铁组织中的一次碳化物明显变粗，碳化物的体积分数逐渐增加。碳含量为5时碳化物体积分数达到62%重量％。当含碳量值增加时，共晶碳化物在热处理铸铁中的积累和生长越来越明显。热处理后，大量二次碳化物会从奥氏体基体中析出，呈细颗粒或短棒状，呈分散分布。HHCCI的宏观硬度有所增加。当碳含量为3.5时wt.%，宏观硬度为61.2 HRC，当碳含量变为5wt.%，达到 64.3 HRC。HHCCI的耐磨性随着碳含量值的增加而增加。当碳含量从 3.5 增加wt.% 至 5.0wt.%，材料的耐磨性提高了85.7%。HHCCI的磨损主要为粘着磨损和疲劳磨损，磨损形态主要为剥落坑和磨屑。