LIU Zhi��yong1,ZHAI Guo��li1��DONG Chao��fang1��LI Xiao��gang1,MENG Qing��kun2��
1.Corrosion and Protection Center, Key lab of Corrosion Erosion and Surface Technology Beijing,University ��of Science and Technology Beijing, Beijing 100083, China; 2. Machine Faculity of Exploration and Production �� ResearchInstitute, Sinopec, Beijing 100083, China
Abstract��Visual examination, chemical analysis, metallographic examination, scanning electronic microscope examination and mechanical test were used to analyze the fracture reason of 40CrNiMo drill. The results indicate that 40CrNiMo presents a impact fatigue type of failure. The occurrence of failure was caused by lack of ductility, coarse surface and big impurity in material.��
������;�Թ���;������;������;��������. 40CrNiMo���ǥͷʧЧ����[J]. �й������ڿ���, 2007, 25(5): 53-0.
LIU Zhi��yong;ZHAI Guo��li;DONG Chao��fang;LI Xiao��gang;MENG Qing��kun��. Failure Analysis on Cracking of 40CrNiMo Drill. Chinese Journal of Iron and Steel, 2007, 25(5): 53-0.
2007, Vol. 25 
