Cleavage cracking resistance of large-angle grain boundaries in Fe-3 wt% Si alloy

被引：47

作者：

Argon, AS ^{[1
]}

Qiao, Y ^{[1
]}

机构：

[1] MIT, Cambridge, MA 02139 USA

来源：

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES | 2002年 / 82卷 / 17-18期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1080/01418610210128096

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Large-angle grain boundaries in steel offer an important resistance to the propagation of cleavage cracks that affects the fracture toughness and can modulate the ductile-to-brittle transition temperature of fracture downwards. This behaviour has been studied in bicrystals of Fe-3 wt% Si alloy in detail. It was noted that the twist misorientation across a large-angle boundary has a more profound effect on cleavage fracture resistance than the tilt misorientation does. Specific measurements of such resistance at -20degreesC over a random selection of large-angle grain boundaries in bicrystals and associated fractographic studies have led to quantitative models of this resistance. The study has also revealed a transition from pure cleavage to mixed cleavage at around 0degreesC for this alloy, above which the observed increment of fracture work could be associated with the sigmoidal plastic bending and rupture of ligaments left between separate primary cleavage strips in the adjoining grain.

引用

页码：3333 / 3347

页数：15

共 11 条

[1]

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