Mechanism of fatigue fracture of G105 drill pipe material under different conditions

被引：0
|
作者：
Huang B.-S. [1 ]
Chen X. [1 ]
Chen Y.-B. [1 ]
Li Y.-B. [2 ]
机构：
[1] School of Materials Science and Engineering, Southwest Petroleum University, Chengdu
[2] Shenyang Oil Production Plant of Liaohe Oilfield, Shenyang
来源：
Cailiao Gongcheng/Journal of Materials Engineering | 2016年 / 44卷 / 02期
关键词：
Fatigue fracture; Fracture; G105 drill pipe steel; Slip;
D O I：
10.11868/j.issn.1001-4381.2016.02.017
中图分类号：
学科分类号：
摘要：
The bending fatigue fracture properties of G105 drill pipe body materials and the influence of H2S corrosion and notch on the specimen bending fatigue performance were studied using the domestic PQ-6 type rotating bending fatigue testing machine. The fracture surfaces of smooth specimens, notched specimens and H2S corroded specimens were analyzed using metallographic microscope and scanning electron microscope. The results show that under the stress of smooth specimens' ultimate fatigue loading, the fatigue life of specimens corroded by H2S is same as that of notched specimens, declining from 106 to 104. The high stress concentration effect of notch can accelerate the process of fatigue crack nucleation in the notch specimen. The main role of H2S corrosion is that the hydrogen atoms will gather together at the inner defects, which will decrease the fatigue life. H2S corrosion and notch both can accelerate the propagation speed of the fatigue cracks. The main reason for the fatigue fracture of material is that the specimens under action of alternating stress engender slip, finally resulting in dislocation stacking. © 2016, Beijing Institute of Aeronautical Materials (BIAM). All right reserved.
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页码：107 / 114
页数：7
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