文献类型：期刊文献

英文题名：Quantitative study of creep cavity area of HP40 furnace tubes

作者：Guan, Kaishu[1]; Xu, Hong[1]; Wang, Zhiwen[1]

机构：[1]E China Univ Sci & Technol, Res Inst Proc Equipment & Pressure Vessels, Shanghai 200237, Peoples R China

年份：2005

卷号：235

期号：14

起止页码：1447

外文期刊名：NUCLEAR ENGINEERING AND DESIGN

收录：;EI(收录号：2005229136029);WOS:【SCI-EXPANDED(收录号:WOS:000230110000002)】；

语种：英文

外文关键词：Continuum mechanics - Crack initiation - Creep - Ethylene - Metallography - Optimization

摘要：Ethylene cracking tubes of HP40 grade (25Cr-35Ni-0.4C) creep-resistant austenitic steel which failed after 80,000 h service were investigated for quantitative cavity evaluation. The results show that the creep cavity area fractions (Omega) present little difference from outer surface to inner surface through the thickness, and larger difference on different tube outer surfaces. The Omega obtained from the outer surface can stand for creep damage state for ethylene cracking tubes. The relationship between creep cavity area fraction and continuum damage mechanics is discussed. At failure, the critical value of damage variable D = 1 is corresponding to Omega = 2.8% measured on the tube outer surface. (c) 2005 Elsevier B.V. All rights reserved.