Effect of pre-strain on impact fracture behavior of X80 pipeline steel

Wang Zhaoyang; You Jingze; Meng Tong; Zhang Lianwang; Sun Chao; Wang Hui; Yu Zhenyang; Song Ming

doi:10.7513/j.issn.1004-7638.2024.04.023

Volume 45 Issue 4

Aug. 2024

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Article Navigation > IRON STEEL VANADIUM TITANIUM > 2024 > 45(4): 163-169

Wang Zhaoyang, You Jingze, Meng Tong, Zhang Lianwang, Sun Chao, Wang Hui, Yu Zhenyang, Song Ming. Effect of pre-strain on impact fracture behavior of X80 pipeline steel[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(4): 163-169. doi: 10.7513/j.issn.1004-7638.2024.04.023

Citation:

Wang Zhaoyang, You Jingze, Meng Tong, Zhang Lianwang, Sun Chao, Wang Hui, Yu Zhenyang, Song Ming. Effect of pre-strain on impact fracture behavior of X80 pipeline steel[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(4): 163-169. doi: 10.7513/j.issn.1004-7638.2024.04.023

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Effect of pre-strain on impact fracture behavior of X80 pipeline steel

doi: 10.7513/j.issn.1004-7638.2024.04.023

1.
School of Mechanical Engineering, Tiangong University, Tianjin 300387, China
2.
China Special Equipment Inspection and Research Institute, Beijing 101300, China
3.
Sinochem Holdings Corporation Ltd., Xiong’an 071051, Hebei, China

Received Date: 2023-11-13
Publish Date: 2024-08-30

Abstract

Abstract

The influence of pre-strain on the impact fracture behavior of X80 pipeline steel was studied. Fracture morphology and inclusions were analyzed by OM, SEM, EDS spectroscopy, and the crystallographic characteristics near the secondary crack on the fracture cross-section were obtained by EBSD. The results show that the pre-strain has no significant effect on the maximum impact load, but pre-strain will increase brittle fracture tendency and notch sensitivity, which leads to decreasing the crack formation energy and crack resistance. In the process of impact fracture, the pre-strain causes the internal dislocations of the material to become entangled with each other, and dislocation movement is hindered. Therefore, brittle fracture is easy to occur when the material is subjected to external force, and the brittle inclusions inside the material also act as the source of cracks. Due to the misorientation between adjacent grains, when the crack propagation encounters the grain boundary, the crack propagation path is deflected when it enters the next grain. In addition, analysis on the crystal orientation of the cross-section near the fracture area indicated that the main cleavage plane of X80 pipeline steel was {100}, followed by {211}.
- X80 pipeline steel,
- impact fracture,
- pre-strain,
- cleaved surface

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References(18)

References

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