<strong>GH3535</strong>合金焊缝高温氦离子辐照效应

doi:10.11900/0412.1961.2022.00040

金属学报

2024, Vol. 60

Issue (3): 299-310 DOI: 10.11900/0412.1961.2022.00040

研究论文

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GH3535合金焊缝高温氦离子辐照效应

白菊菊¹^,², 李健健¹^,²(

), 付崇龙¹^,², 陈双建¹, 李志军¹, 林俊¹^,²(

)

¹中国科学院上海应用物理研究所上海 201800
²中国科学院大学北京 100049

Effect of He Ion Irradiation on the GH3535 Weld Metal at High Temperature

BAI Juju¹^,², LI Jianjian¹^,²(

), FU Chonglong¹^,², CHEN Shuangjian¹, LI Zhijun¹, LIN Jun¹^,²(

)

¹Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
²University of Chinese Academy of Sciences, Beijing 100049, China

引用本文:

白菊菊, 李健健, 付崇龙, 陈双建, 李志军, 林俊. GH3535合金焊缝高温氦离子辐照效应[J]. 金属学报, 2024, 60(3): 299-310.
Juju BAI, Jianjian LI, Chonglong FU, Shuangjian CHEN, Zhijun LI, Jun LIN. Effect of He Ion Irradiation on the GH3535 Weld Metal at High Temperature[J]. Acta Metall Sin, 2024, 60(3): 299-310.

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摘要:

焊缝因其组织及力学性能不均匀性常被视为结构材料的薄弱环节。本工作对焊缝进行高温氦离子辐照效应研究，明确辐照缺陷在焊缝与母材中的演化差异。850℃下，对GH3535合金焊接接头进行2 × 10¹⁶ ions/cm²氦离子辐照，利用TEM和纳米压痕仪对焊缝和母材的微观结构及力学性能进行表征，对比分析高温下焊缝中微观缺陷的演化行为及力学性能变化。结果表明，850℃下，焊缝中He泡多分布在位错线和碳化物-基体界面上，碳化物-基体界面上的He泡较位错线上的He泡尺寸更小，密度更高；焊缝中峰值处He泡平均数密度小于母材，尺寸略大于母材，而位错环的数密度和尺寸均小于母材。纳米压痕结果表明，同样辐照条件下，焊缝的辐照硬化程度(36%)约为母材(70%)的一半。经DBH模型计算确认辐照后样品中He泡和位错环是造成辐照硬化的主要因素。分析认为，高温下纳米碳化物和位错线对He原子以及间隙子的捕获是导致焊缝与母材辐照行为差异的关键原因。

关键词 ： GH3535焊接接头, 氦离子辐照, He泡, 位错环, 辐照硬化

Abstract：

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 850^oC. 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 850^oC, 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.

Key words： GH3535 welded joint He ion irradiation helium bubble dislocation loop irradiation hardening

收稿日期: 2022-01-27

ZTFLH:

TL426

基金资助:国家自然科学基金项目(12175301);国家自然科学基金项目(11605272);中国科学院前沿科学重点项目(QYZDY-SSW-JSC016);中国科学院战略性先导科技专项项目(XDA02030200);上海市自然科学基金项目(22ZR1474800);兰州重离子研究装置支持项目(HIR2021PY007)

通讯作者: 李健健，lijianjian@sinap.ac.cn，主要从事核材料辐照效应研究; 林俊，linjun@sinap.ac.cn，主要从事先进核能材料与先进核燃料研究

Corresponding author: LI Jianjian, professor, Tel: (021)39194239, E-mail: lijianjian@sinap.ac.cn; LIN Jun, professor, Tel: (021)39194026, E-mail: linjun@sinap.ac.cn

作者简介: 白菊菊，女，1992年生，博士

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表1 GH3535合金和焊丝的化学成分 (mass fraction / %)

图1 使用SRIM-2013软件模拟的氦离子浓度及离位损伤随入射深度的分布

图2 焊缝和母材的EBSD晶粒图、SEM像以及TEM下位错线和碳化物分布

图3 焊缝中He泡随氦离子辐照深度的分布

图4 母材中He泡随氦离子辐照深度的分布

图5 TEM明场下焊缝、母材峰值区域He泡的分布，及双束条件下焊缝和母材中He泡的分布

图6 焊缝和母材中He泡数的密度及尺寸随辐照深度的分布

图7 焊缝和母材随辐照深度分布的肿胀率曲线

图8 弱束TEM明暗场下焊缝中峰值区域的位错环分布(850℃)

图9 弱束TEM明暗场下母材中的峰值区域位错环的分布(850℃)

图10 辐照前后母材和焊缝的硬度随压入深度变化及H2-1 / h曲线

Sample	Defect	Δσ MPa	Δσ_total MPa	Δ $H c a l$ GPa	Δ $H e x p$ GPa
GH3535	Helium bubble	310	580	1.74	1.84
GH3535	Dislocation loop	490
Weld metal	Helium bubble	240	342	1.02	1.21
Weld metal	Dislocation loop	243

表2 850℃下经2 × 1016 ions/cm2氦离子辐照后焊缝和母材的屈服强度增量与纳米硬度增量

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