English  |  正體中文  |  简体中文  |  Items with full text/Total items : 26994/38795
Visitors : 2389878      Online Users : 43
RC Version 4.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Adv. Search

Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/23731

Title: Microstructure and Stress Corrosion Cracking Behavior of the Weld Metal in Alloy 52-A508 Dissimilar Welds
Authors: Wei-Chih Chung;Jiunn-Yuan Huang;Leu-Wen Tsay;Chun Chen
Contributors: NTOU:Institute of Materials Engineering
Keywords: A508 steel;Alloy 52 filler metal;dissimilar welds;microstructures;stress corrosion cracking;high-temperature water
Date: 2011
Issue Date: 2011-10-20T08:07:36Z
Publisher: Materials Transactions(The Japan Institute of Metals)
Abstract: abstract:In the nuclear power industry, dissimilar metal welding is widely used for joining low alloy steel to austenite stainless steel components
with nickel-base filler metals. In this study, attention was paid to the weld metal in multi-pass Alloy 52-A508 dissimilar welds. An approximately 2 mm wide transition zone was observed that consisted of a martensitic layer (1020um) along the weld interface and the austenite phase region with varying degrees of dilution. After post-weld heat treatment, the microstructures near the weld interface consisted of martensite, carbides and Type II boundaries. The presence of Type II boundaries significantly reduced the resistance to stress corrosion cracking (SCC) and formed intergranular cracking under simulated reactor coolant conditions. Constant extension rate tensile (CERT) tests were performed on the notched tensile specimens in 300 C water at two extension rates, 3104 and 1106 mm/s. A fast CERT test can be
regarded to have no contribution of corrosion, and its results can be used as standards for comparison. In the slow CERT tests, the ductility losses of round-bar specimens with a circumferential notch at various regions in the weld metal were ranked accordingly. The relative susceptibility to SCC in terms of the ductility loss in increasing order of severity was as follows: the undiluted weld metal, the transition zone and the weld interface. SEM fractographic observations were consistent with the SCC results, i.e., an increased ductility loss or SCC susceptibility was associated with more brittle fractures.
Relation: 52(1), pp.12-19
URI: http://ntour.ntou.edu.tw/handle/987654321/23731
Appears in Collections:[材料工程研究所] 期刊論文

Files in This Item:

File Description SizeFormat

All items in NTOUR are protected by copyright, with all rights reserved.


著作權政策宣告: 本網站之內容為國立臺灣海洋大學所收錄之機構典藏,無償提供學術研究與公眾教育等公益性使用,請合理使用本網站之內容,以尊重著作權人之權益。
網站維護: 海大圖資處 圖書系統組
DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback