Fracture Analysis on the Input Shaft of Coal Pulverize Reducer of 350 MW Supercritical Unit
LIU Shuang1,YUE Zeng-wu1,MA Cui-hua2
1. Shandong Electric Power Research Institute, Jinan 250002, Shandong, China 2. Huangtai Power-Plant of Huaneng Power International, Jinan 250100, Shandong, China
Abstract��Fracture occurred after 3 months operation of input shaft of coal pulverize reducer. After the investigation of metallographic examination, composition of chemical elements, mechanical properties, macroscopic examination and SEM, it showed that the metallographic and composition of chemical elements of input shaft meet the relevant technical standards. The fracture was typical brittle fracture; and the fracture mode was low cycle fatigue brittle fracture. As the input shaft of surface was not required for carburization, the surface hardness was low; extension strength and yield strength were below the requirement of product quality certificate, so that the crack source generated on the stressed side of keyway; and the position of key way was poorly designed, which accelerated the fracture.
��ˬ�������䣬��仨. 350 MW���ٽ��¯ĥú�����ٻ���������ѷ���[J]. �й������ڿ���, 2011, 29(5): 36-39.
LIU Shuang1,YUE Zeng-wu1,MA Cui-hua2. Fracture Analysis on the Input Shaft of Coal Pulverize Reducer of 350 MW Supercritical Unit. Chinese Journal of Iron and Steel, 2011, 29(5): 36-39.
2011, Vol. 29 
