DUCTILE FRACTURE TOPOGRAPHY - GEOMETRICAL CONTRIBUTIONS AND EFFECTS OF HYDROGEN

被引:44
作者
THOMPSON, AW
机构
[1] Department of Metallurgy and Materials Science, Carnegie-Mellon University, Pittsburgh, 15213, PA
来源
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1979年 / 10卷 / 06期
关键词
D O I
10.1007/BF02658394
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A volume element which is deformed becomes elongated and narrowed with increasing strain, for reasons of constant plastic volume; inclusion spacings experience the same changes. Equivalent plasticity expressions permit a description of this effect as a function of fracture strain. Such an effect must be taken into account in comparison of initial inclusion spacings with dimple sizes observed in tensile or toughness specimen fractures. It also plays a role in the assessment of dimple size changes in hydrogen-assisted ductile fracture. The most convenient way to display the effect in the hydrogen case is on a plot of ductility loss vs dimple size ratio. This comparison demonstrates that the geometrical effect generally should lead to large increases in size ratio as ductility decreases; thus the common observations of dimple size reduction with hydrogen evidently represent large increases in dimple nucleation, while dimple size increases may represent microvoid growth effects. © 1979 American Society for Metals and The Metallurgical Society of AIME.
引用
收藏
页码:727 / 731
页数:5
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