针对高速钢轧辊剥落试样，通过SEM对试样表面裂纹、内部裂纹和断口形貌进行了观察，同时对样品进行了EDS分析及硬度测试，研究了高速钢轧辊组织中碳化物种类、形态及分布，分析了影响疲劳裂纹形成、扩展因素，以及硬度和耐磨性变化的影响因素。结果表明：高速钢轧辊表面产生热疲劳裂纹的主要原因是由于轧辊受到剧烈的冷热温度交替变化，在辊表面产生严重热应变，出现热疲劳裂纹，扩展后造成剥落。裂纹萌生、扩展路径和方式与热疲劳或接触疲劳应力有关，减少轧辊中夹杂物的数量，细化夹杂物状态，改善轧辊组织中碳化物的形态和分布，有利于减轻热疲劳裂纹的萌生和扩展。
A used high speed steel （HSS） roll containing cracks were examined by means of scanning electron microscopy, EDS analysis and hardness measurements. The microstructure and its influence on thermal fatigue behavior of the HSS roll were also investigated. The results indicate that the main failure mechanism of the HSS roll is thermal fatigue and contact fatigue due to the alternative variation between low and high temperature and contact fatigue stress in the process of service of the roll. The present work suggests that decreasing inclusion number, refining inclusions, improving carbide morphology and distribution are beneficial to the performance of the HSS roll.
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