Fatigue crack deflection and branching behavior of low carbon steel under mechanically large grain condition

被引：30

作者：

Bui, Thao Phuong ^{[1
]}

Miyashita, Yukio ^{[2
,6
]}

Mutoh, Yoshiharu ^{[3
]}

Morikage, Yasushi ^{[4
]}

Tagawa, Tetsuya ^{[5
]}

Handa, Tsunehisa ^{[5
]}

Otsuka, Yuichi ^{[3
]}

机构：

[1] Nagaoka Univ Technol, Grad Sch Mat Sci, 1603-1 Kamitomioka, Nagaoka, Niigata 9402188, Japan

[2] Nagaoka Univ Technol, Dept Mech Engn, 1603-1 Kamitomioka, Nagaoka, Niigata 9402188, Japan

[3] Nagaoka Univ Technol, Dept Syst Safety, 1603-1 Kamitomioka, Nagaoka, Niigata 9402188, Japan

[4] JFE Technores Corp, Kawasaki Ku, 1-1 Minamiwataridacho, Kawasaki, Kanagawa 2100855, Japan

[5] JFE Steel Corp, Chiyoda Ku, 2 Chome 2, Tokyo 1000011, Japan

[6] Nagaoka Univ Technol, Dept Mech Engn, 1603-1 Kamitomioka, Nagaoka, Niigata 9402188, Japan

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2021年 / 148卷

关键词：

Crack deflection; Crack branching; Mechanically large grain; Crystal orientation; Crack tip stress shielding; Low carbon steel; PROPAGATION BEHAVIOR; MECHANISMS; ORIENTATION; DUCTILE;

D O I：

10.1016/j.ijfatigue.2021.106217

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

In situ SEM observation of fatigue crack growth behavior of low carbon steel under mechanically large grain condition, and EBSD analysis were carried out to investigate mechanisms of crack deflection and branching and effects of crystal orientation on them. It is found that the crack propagates along the activated slip bands in the present material and the crack deflection can be formed when a new activated slip band is created in a different direction from the growing crack. The crack branching can be formed by the following process: (1) the slip band along the crack cannot be activated further due to the restraint by such as grain boundary or strain hardening, (2) the crack cannot propagate further in the same direction, and (3) the secondary slip plane is activated to form a new slip band behind the crack tip. Not the stress intensity factors Kdef for deflected crack and ?Keff for crack closure but rather the ?Keff,tip is the intrinsic fracture mechanics parameter for controlling fatigue crack growth behavior of the material with crack deflection and branching.

引用

页数：12

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