Corrosion Behavior of T91/316L Weld Seams with Different Chemical Compositions in 550℃ High-speed Flowing Liquid Lead-bismuth Eutectic Alloy

被引：0
|
作者：
Xiao L. [1 ]
Lei Y. [1 ]
Zhu Q. [1 ]
Li T. [1 ]
Chen G. [1 ]
Luo M. [1 ]
Zhao J. [1 ]
Chen W. [1 ]
机构：
[1] School of Material Science and Engineering, Jiangsu University, Zhenjiang
来源：
Cailiao Daobao/Materials Reports | 2019年 / 33卷 / 06期
基金：
中国国家自然科学基金;
关键词：
316L steel; Corrosion; Lead-bismuth eutectic alloy (LBE); T91; steel; Weld seam;
D O I：
10.11896/cldb.18060005
中图分类号：
学科分类号：
摘要：
The corrosion of T91/316L dissimilar weld seam in high-speed flowing liquid lead-bismuth eutectic alloy (LBE) is an important challenge for the future application of T91 and 316L steels in nuclear industry. In this paper, the corrosion test of T91/316L dissimilar weld seams obtained by using three different welding wires (ER309L, ER316L and ERNiCr-3) in 550 ℃ high-speed flowing liquid LBE (relative flow rate of 2.98 m/s) was carried out in a self-designed rotary corrosion device. After being corroded for 300 h, 600 h and 900 h, the surface of all weld seams showed obvious directionality. The corrosion mechanism of weld seam in the high-speed flowing liquid LBE is mainly the dissolution and migration of Fe, Cr and Ni elements in the weld matrix and Pb, Bi, and O elements in the LBE. Due to the different solubility of different elements and the different stability of oxide phases, a double-layer structure consisting of a loose outer oxide layer and a dense inner oxide layer was finally formed on the surface of weld seam. The corrosion resistance of weld seam by using 309L welding wire in the high-speed flowing LBE was the best, followed by 316L welding wire, and that using NiCr-3 welding wire was the worst. The weld seam after heat treatment showed better corrosion resistance to high-speed flowing LBE. © 2019, Materials Review Magazine. All right reserved.
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页码：1805 / 1812
页数：7
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