Microstructural evolution and corrosion behaviour of thermally aged dissimilar metal welds of low-alloy steel and nickel-based alloy

被引：23
|
作者：
Choi, Kyoung Joon [1 ]
Yoo, Seung Chang [2 ]
Kim, Seunghyun [3 ]
Kim, Taeho [2 ]
Ham, Junhyuk [2 ]
Lee, Jeonghyeon [2 ]
Kim, Ji Hyun [2 ]
机构：
[1] KAERI, Nucl Mat Div, 111 Daedeok Daero 989 Beon Gil, Daejeon 34057, South Korea
[2] Univ Wisconsin, Dept Engn Phys, 1415 Engn Dr, Madison, WI 53706 USA
[3] KIMS, Authorized Nucl Inspect Dept, 797 Changwon Daero, Changwon Si 51395, Gyeongsangnam D, South Korea
来源：
CORROSION SCIENCE | 2019年 / 153卷
基金：
新加坡国家研究基金会;
关键词：
Low alloy steel; SEM; TEM; High temperature corrosion; Welding; Inclusion; ION SPECIMEN PREPARATION; HEAT-AFFECTED ZONE; HIGH-TEMPERATURE; FUSION BOUNDARY; ATOM-PROBE; CRACKING BEHAVIOR; GRAIN-BOUNDARIES; STAINLESS-STEEL;
D O I：
10.1016/j.corsci.2019.03.032
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The influences of thermal aging on the microstructure, mechanical properties, and corrosion resistance of two different Ni-based weld metal/low-alloy steel dissimilar metal weld fusion boundaries were analysed. Cr23C6 precipitated at the fusion boundary immediately after welding. Additional precipitates were formed in 15 years of thermal aging and coarsened after 30 years of thermal aging. Changing precipitate morphology induced changes in other properties; the highest hardness and corrosion rate were observed at 15 years of thermal aging. The potential difference was bigger in welds with Alloy 152 than those with Alloy 182, yielding higher rates of galvanic corrosion.
引用
收藏
页码：138 / 149
页数：12
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