Role of δ-ferrite in stress corrosion cracking retardation near fusion boundary of 316NG welds

被引：40
作者：
Abe, Hiroshi [1 ]
Watanabe, Yutaka [1 ]
机构：
[1] Tohoku Univ, Grad Sch Engn, Aoba Ku, Sendai, Miyagi 9808579, Japan
来源：
JOURNAL OF NUCLEAR MATERIALS | 2012年 / 424卷 / 1-3期
关键词：
STAINLESS-STEEL WELDS; SOLIDIFICATION; MICROSTRUCTURE;
D O I：
10.1016/j.jnucmat.2012.02.006
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Stress corrosion cracking (SCC) near the fusion boundary of a 316NG stainless steel (SS) welded joint in high-temperature water was investigated with emphasis on the relation to the microstructural characteristics. delta-Ferrite islands were distributed on the crack paths (grain boundary in the partially melted zone and cell boundary in the unmixed zone) near the fusion boundary of 316NG SS piping. SCC retardation near the fusion boundary was clearly observed in our experiments. The relative crack growth rate (CGR) at the delta-gamma interface was estimated to be 0.043 times lower than that at the gamma-gamma interface. The cracks remained for a considerable period of time just after they reached the delta-ferrite islands. Even those cracks that passed through an initial set of delta-ferrite islands were retarded when they encountered a subsequent set of delta-ferrite islands. High corrosion resistance due to the presence of large amounts of Cr and the island-shaped morphology of delta-ferrite are dominant factors in SCC retardation. (C) 2012 Elsevier B.V. All rights reserved.
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页码：57 / 61
页数：5
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