Study on Fracture Behavior and Toughening Mechanisms of Ultra-High-Strength Pipeline Steel

被引:1
|
作者
Li, Ba [1 ,2 ,3 ]
Zhou, Xiaoshun [1 ]
Jia, Shujun [2 ]
Chen, Xiaoping [2 ]
Fu, Song [3 ]
Zhao, Dongliang [3 ]
Zhang, Haonan [3 ]
Guo, Jie [4 ]
机构
[1] Zhejiang Normal Univ, Coll Chem & Life Sci, Jinhua 321004, Peoples R China
[2] Cent Iron & Steel Res Inst Co Ltd, Beijing 100081, Peoples R China
[3] Zhejiang Innuovo Magnet Co Ltd, Dongyang 322118, Peoples R China
[4] PetroChina Planning & Engn Inst, Beijing 100083, Peoples R China
关键词
ultra-high-strength pipeline steel; CVN; DWTT; toughening mechanism; WEIGHT TEAR TEST; API X70; CRACK-PROPAGATION; X80; MICROSTRUCTURE; TOUGHNESS; X100;
D O I
10.3390/met14060666
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this paper, a series of low-temperature CVN (Charpy V-notch impact test) and DWTT (drop-weight tear test) experiments were carried out to deal with the intensifying contradiction of strength and toughness of ultra-high-strength pipeline steel. The fracture behavior and toughening mechanisms of ultra-high-strength pipeline steel were investigated using scanning electron microscopy, transmission electron microscopy and backscattered electron diffraction systems. The results show that DWTT fractures in ultra-high-strength pipeline steel had a variety of unconventional morphological features compared to CVN fractures, including ridge protrusion in ductile fracture conditions and a large-size fracture platform in brittle fracture conditions. Therefore, DWTT fractures contained more information about the material fracturing process, and could better reflect the actual process of material fracturing. In ultra-high-strength pipeline steel, fine-grained granular bainite caused cracks to undergo large deflections or frequent small transitions, which consumed additional energy and improved toughness. In contrast, large-sized granular bainite, which consisted of low-angle grain boundaries, did not effectively prevent crack propagation when it encountered cracks, which was not conducive to improved toughness. Moreover, the M/A constituents in large-sized granular bainite aggregated, cracked, or fell off, which could easily lead to the formation of microcracks and was also detrimental to toughening.
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页数:21
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