Low-temperature fracture mechanisms in a spheroidised reactor pressure vessel steel

被引：7
|
作者：
Kumar, A. [1 ]
Roberts, S. G. [1 ]
Wilkinson, A. J. [1 ]
机构：
[1] Univ Oxford, Dept Mat, Oxford OX1 3PH, England
来源：
INTERNATIONAL JOURNAL OF FRACTURE | 2007年 / 144卷 / 03期
基金：
英国工程与自然科学研究理事会;
关键词：
ferritic steels; fracture; low temperature deformation; brittle-ductile transitions; quasi-cleavage;
D O I：
10.1007/s10704-007-9084-3
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The micromechanisms of fracture of a spheroidised A533B reactor pressure vessel steel over the temperature range of - 190 degrees C to +60 degrees C were investigated by performing uniaxial tensile tests on double-notched cylindrical specimens. Failure was by quasi-cleavage at temperatures between -190 degrees C and - 145 degrees C. Quasi-cleavage fracture surfaces are characterised by clusters of planar facets that are separated from other facets either by large voids or by clusters of microvoids. At temperatures between - 145 degrees C and -25 degrees C failure was by mixed microvoid coalescence and cleavage while complete microvoid coalescence was observed at temperatures higher than -25 degrees C. Over the whole temperature range studied, fracture nucleation was either from large single voids or localised regions of microvoids.
引用
收藏
页码：121 / 129
页数：9
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