Effect of He Ion Irradiation on the GH3535 Weld Metal at High Temperature
Received date: 2022-01-27
Revised date: 2022-08-01
Online published: 2022-09-26
Supported by
National Natural Science Foundation of China(12175301);National Natural Science Foundation of China(11605272);Frontier Science Key Program of Chinese Academy of Sciences(QYZDY-SSW-JSC016);Strategic Priority Research Program of Chinese Academy of Sciences(XDA02030200);Natural Science Foundation of Shanghai(22ZR1474800);Heavy Ion Research Facility in Lanzhou (HIRFL)(HIR2021PY007)
GH3535 high-temperature nickel-based alloy was selected as the main structural material for the molten salt reactor because of its high-temperature strength and excellent corrosion resistance to molten salts. In general, the welded joints used to join structural materials are considered as the potentially weakest part because of the inhomogeneity in microstructure caused by repeated thermal cycle treatments. Helium embrittlement at high temperatures is an important issue that affects the safety and structural integrity of the components made of nickel-based alloys working in a reactor environment. In this study, the GH3535-welded joint was irradiated with 500 keV of He ions at 850oC. The microstructure and mechanical properties of the weld and base metal were characterized and compared by TEM and nano-indentation, and the effect of the intrinsic microstructure of the weld on the irradiation effect was investigated. Results show that the helium bubbles in the weld are basically distributed on the dislocation lines and carbide-base metal interface. The helium bubbles on the carbides-base metal interface are smaller, and they have higher density than those on the dislocation lines. The average number density of helium bubbles and dislocation loops in the peak damage region of the weld are smaller than those of the base metal. Therefore, at 850oC, dislocation lines, and the carbides-base metal interface are strong traps for helium and interstitial atoms, which affect the nucleation of helium bubbles and dislocation loops. In addition, the carbides-base metal interface can effectively inhibit the growth of helium bubbles. The results of nano-indentation show that the degree of the irradiation-induced hardening of the weld metal (36%) is about half of that of the base metal (70%) under the same irradiation condition. Therefore, the DBH model confirms that helium bubbles and dislocation loops primarily cause irradiation hardening. The enhanced trapping of helium atoms and interstitials by nano-carbides and dislocation lines at a high temperature is the key factor for the distinct irradiation behavior of welds compared with base metals.
BAI Juju , LI Jianjian , FU Chonglong , CHEN Shuangjian , LI Zhijun , LIN Jun . Effect of He Ion Irradiation on the GH3535 Weld Metal at High Temperature[J]. Acta Metall Sin, 2024 , 60(3) : 299 -310 . DOI: 10.11900/0412.1961.2022.00040
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