GH3535合金焊缝高温氦离子辐照效应

被引：0

作者：

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
]}

机构：

[1] 中国科学院上海应用物理研究所

[2] 中国科学院大学

来源：

金属学报 | 2024年 / 60卷 / 03期

基金：

上海市自然科学基金;

关键词：

GH3535焊接接头; 氦离子辐照; He泡; 位错环; 辐照硬化;

D O I：

暂无

中图分类号：

TL426 [熔盐堆]; TG441.7 [焊接缺陷及质量检查];

学科分类号：

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。

引用

页码：299 / 310

页数：12

共 32 条

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