Abstract��Wheel steel with rim crack was investigated by using chemical analysis, metallography, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results showed that the main reason was the presence of angular Al2O3 inclusions in the source region of crack. Although the inclusions met the standards, because the morphology and structure of inclusions were not reasonably controlled, it can cause cracking failure of the rim when the application state of materials deteriorated. By controlling the oxides in wheel steel for passenger/high-speed train as composite structure of "spherical MnS-wrap Al2O3 inclusions ", it can create fine dispersive distribution of the oxides, mitigating the splitting and scratch effect of brittle inclusions on matrix tissue and reducing the stress from brittle inclusions embedded in the matrix tissue. Thus, the possibility of the formation of cracks sources was minimized, fatigue life of materials was improved, and rim crack was prevented.
�� ΰ. �ͳ������ѷ�������ٳ��ָֹ��ոĽ�̽��[J]. �й������ڿ���, 2015, 33(2): 38-43.
LI Wei. Analysis of wheel rim crack and discussion on process improvement of high speed wheel steel. Chinese Journal of Iron and Steel, 2015, 33(2): 38-43.
2015, Vol. 33 
