Measurement of fracture properties of Zr-2.5 Wt.% Nb pressure tube material and effect of trace impurities

被引：0
|
作者：
K. Kapoor
S. V. Swamy
N. Saratchandran
V. K. Saxena
G. Malakondaiah
B. P. Kashyap
机构：
[1] Nuclear Fuel Complex,
[2] Defense Metallurgical Research Laboratory,undefined
[3] Indian Institute of Technology,undefined
来源：
Practical Failure Analysis | 2002年 / 2卷 / 3期
关键词：
fracture toughness; trace impurities; zirconium-2.5 wt.% niobium; pressure tube;
D O I：
10.1007/BF02719192
中图分类号：
学科分类号：
摘要：
This paper reports the details of a test method that uses elements of elastic-plastic fracture mechanics to assess fracture resistance of zirconium (Zr)-2.5 wt.% niobium (Nb) pressure tubes for a pressurized heavy water reactor. The fracture properties were evaluated on curved specimens, and the effect of certain trace elements on the fracture properties was determined. Significant reduction of trace impurities, produced by using four-stage melting practices rather than the conventional two-stage process, was observed to cause considerable improvement in the fracture resistance of the alloy. Scanning electron microscopy (SEM) of the fracture surfaces of the test specimens confirmed this observation.
引用
收藏
页码：65 / 70
页数：5
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