Influence of Grain Size on the Ductile Fracture Toughness of Ferritic Steel

被引：16

作者：

Qiu, Hai ^{[1
]}

Hanamura, Toshihiro ^{[1
]}

Torizuka, Shiro ^{[1
]}

机构：

[1] Natl Inst Mat Sci, Res Ctr Strateg Mat, Tsukuba, Ibaraki 3050047, Japan

来源：

ISIJ INTERNATIONAL | 2014年 / 54卷 / 08期

关键词：

fracture toughness; crack tip opening displacement; grain size; ferrite; ductile fracture; ferritic steel; FERRITE/CEMENTITE STEELS; HIGH-STRENGTH; MICROSTRUCTURE; TEMPERATURE; REFINEMENT; EVOLUTION; BALANCE; BAR;

D O I：

10.2355/isijinternational.54.1958

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The ductile fracture toughness of ferritic steel was assessed in terms of crack tip opening displacement (CTOD). The CTOD is composed of two parts: elastic and plastic. In the ductile fracture region, as compared to the elastic part, the fraction of the plastic part is dominant. The CTOD linearly increases with an increase in ferrite grain size, but grain coarsening simultaneously increases the possibility of cleavage fracture. As yield strength increases, the CTOD decreases due to the decreased plastic deformation ability.

引用

页码：1958 / 1964

页数：7

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