Forming mechanism of delamination cracks observed during tensile and fracture toughness testing of X70 pipeline steel

被引：4
作者：
Park, Dong-Yeob [1 ]
Amirkhiz, Babak Shalchi [2 ]
Gravel, Jean-Philippe [1 ]
Liang, Jie [2 ]
Zavadil, Renata [2 ]
Liu, Pei [2 ]
Duan, Da-Ming [3 ]
机构：
[1] Nat Resources Canada, CanmetMAT, 3303-33 St NW, Calgary, AB T2L 2A7, Canada
[2] Nat Resources Canada, CanmetMAT, 183 Longwood Rd South, Hamilton, ON L8P0A5, Canada
[3] TransCanada, 450-1st St SW, Calgary, AB T2P5H1, Canada
来源：
INTERNATIONAL JOURNAL OF FRACTURE | 2018年 / 209卷 / 1-2期
关键词：
Split; Delamination; Brittle fracture; Tensile test; Toughness test; Intergranular fracture; THICKNESS;
D O I：
10.1007/s10704-017-0240-0
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this study, we have investigated microstructures of the delamination cracks observed from tensile and fracture toughness test specimens using an API X70 pipeline steel. It is found that the delaminations observed from both tensile and toughness specimens are intergranular fractures. At the occurrence, characteristics of brittle fracture were observed, but it was found not to be a brittle fracture as the delaminations were induced by plastic deformation. It is shown that severe plastic deformation produced strain concentration around particles located along grain boundaries and caused decohesion between adjacent grains, resulting in intergranular fracture.
引用
收藏
页码：223 / 229
页数：7
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