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通过对断裂回转支承外圈的宏观分析及其化学成分、高低倍组织、断口等分析,认为外圈断裂的主要原因是滚道表层淬火马氏体未经回火和显微组织过热引起的。
By analyzing the macroscopical analysis, chemical composition, high and low magnification microstructure, fracture and other analysis, the main cause of the outer ring fracture is the quenched martensite on the raceway surface without overheating and microstructure overheating.