The radial delayed hydride cracking behavior of Zr-2.5Nb alloy pressure tube at different temperatures
作者
单位
1Key Laboratory of Nuclear Materials and Safety Assessment、Institute of Metal Research、Chinese Academy of Sciences、Shenyang 110016、PR China 2 School of Materials Science and Engineering、University of Science and Technology of China、Shenyang 110016、PR China
关键词
收录来源
International Corrosion Congress · 第22届国际腐蚀大会
摘要
Cantilever beam samples with V -notches were employed to measure the radial delayed hydride cracking rate (DHCR) in Zr -2.5Nb alloy pressure tubes within the temperature range from 120 °C to 250 °C in this study. Both initiation and propagation of DHC were monitored using DCPD technique. The results show that radial DHCR and temperature fit the Arrhenius relationship within the temperature as mentioned above range, yielding a crack propagation activation energy of 38.66 kJ/mol. It was observed that the incubation periods for radial DHC initiation typically shortened with rising temperature from 180 °C to 250 °C, and the anisotropy of DHCR is also discussed in this study. Besides, the presence of undissolved circumferential hydrides appears to affect radial DHC behavior.