40CrNiMo钻杆钎头失效分析

物理测试, 2007, 25(5): 53-0.

40CrNiMo钻杆钎头失效分析

1.1.北京科技大学腐蚀与防护中心，北京市腐蚀、磨蚀与表面技术开放实验室，北京100083；〖DW〗2.中国石油勘探开发研究院机械所，北京100083

1.1.Corrosion and Protection Center, Key lab of Corrosion Erosion and Surface Technology Beijing,University of Science and Technology Beijing, Beijing 100083, China

2. 2. Machine Faculity of Exploration and Production  ResearchInstitute, Sinopec, Beijing 100083, China

关键词： 40CrNiMo , rod bit , fatigue failure , failure analysis

Failure Analysis on Cracking of 40CrNiMo Drill

LIU Zhiyong , ZHAI Guoli , DONG Chaofang , LI Xiaogang , MENG Qingkun

Keywords： 40CrNiMo , 钻杆钎头 , 疲劳断裂 , 失效分析

采用宏观和微观腐蚀形貌观察、化学成分分析、金相分析、力学性能测试以及相关的理论计算对40CrNiMo钻杆钎头断裂失效的原因进行分析。结果表明：40CrNiMo钻杆钎头发生的是冲击疲劳断裂；材质韧性不足、粗糙表面或内部较大的夹杂物共同促进了裂纹发生，并导致最终断裂。

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.

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