He+ 辐照对CLAM钢焊缝微观组织和性能的影响

doi:10.11901/1005.3093.2021.451

材料研究学报

2022, Vol. 36

Issue (8): 609-616 DOI: 10.11901/1005.3093.2021.451

研究论文

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He⁺ 辐照对CLAM钢焊缝微观组织和性能的影响

刘丹¹, 雷玉成¹(

), 张伟伟¹, 李天庆¹, 姚奕强², 丁祥彬²

^1.江苏大学材料科学与工程学院镇江 212013
^2.中广核研究院有限公司深圳 518000

Effect of He Ion Irradiation on Microstructure and Properties of CLAM Steel Weld

LIU Dan¹, LEI Yucheng¹(

), ZHANG Weiwei¹, LI Tianqing¹, YAO Yiqiang², DING Xiangbin²

^1.School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China
^2.China General Nuclear Power Corporation, Shenzhen 518000, China

引用本文:

刘丹, 雷玉成, 张伟伟, 李天庆, 姚奕强, 丁祥彬. He⁺ 辐照对CLAM钢焊缝微观组织和性能的影响[J]. 材料研究学报, 2022, 36(8): 609-616.
Dan LIU, Yucheng LEI, Weiwei ZHANG, Tianqing LI, Yiqiang YAO, Xiangbin DING. Effect of He Ion Irradiation on Microstructure and Properties of CLAM Steel Weld[J]. Chinese Journal of Materials Research, 2022, 36(8): 609-616.

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摘要:

在室温下用强度为70 keV的He⁺辐照CLAM钢焊缝,使用扫描电子显微镜(SEM)、透射电子显微镜(TEM)和连续刚度纳米压痕技术(CSM)对其表征,研究了He⁺辐照对CLAM钢焊缝的微观组织和性能的影响。结果表明,随辐照剂量的增大焊缝表面黑色孔洞的尺寸增大、密度提高；辐照剂量为1×10¹⁷ ions·cm^-2时,在两种焊缝中形成的位错环的尺寸分别约为18.97 nm、15.73 nm,数密度分别约为2.24×10²¹ m^-3、1.78×10²¹ m^-3,氦泡引起的辐照肿胀率分别约为1.7%和0.4%；辐照缺陷(位错环、氦泡)导致的辐照硬化率分别为49.0%和29.9%。与焊态焊缝相比,调质处理态焊缝的辐照损伤较弱,在一定程度上表明经调质处理后焊缝的抗辐照性能有所提高。

关键词 ：金属材料, 辐照硬化, 离子辐照, 调质处理, CLAM钢焊缝

Abstract：

In order to explore the mechanism of the influence of ion irradiation on the microstructure and properties of as-welded and quenched and tempered welds, the welds of Low Activation Martensitic (CLAM) steel were subjected to He ion irradiation at room temperature of 70 keV. Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Continuous Stiffness Measurement (CSM) detection methods were utilized to investigate the changes in microstructure and properties of CLAM steel welds before and after ion irradiation. The results show that the size and number density of black holes on the welds' surface after irradiation increased with the rising irradiation dose; at the irradiation dose of 1×10¹⁷ ions·cm^-2, the sizes of dislocation loops formed in the two welds were 18.97 nm and 15.73 nm respectively and the number densities were 2.24×10²¹ m^-3 and 1.78×10²¹ m^-3 respectively; the irradiation swelling rates caused by helium bubbles were 1.7% and 0.4% respectively; the radiation hardening rate caused by irradiation defects (dislocation loops and helium bubbles) were 49.0% and 29.9%, respectively. However, compared with as-welded weld, the irradiation damage of quenched and tempered weld was relatively weaker after He ion irradiation. To a certain extent, it showed that the anti-irradiation performance of the weld after quenched and tempered was improved.

Key words： metallic materials irradiation hardening ion irradiation quenched and tempered treatment CLAM steel welds

收稿日期: 2021-08-13

ZTFLH:

TL341

基金资助:国家自然科学基金(51875264)

作者简介: 刘丹,女,1995年生,硕士生

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表1 CLAM钢的化学成分(质量分数,%)

图1 辐照损伤量随离子注入深度的变化曲线

图2 辐照剂量不同的焊态和调质处理态焊缝表面的SEM照片

图3 辐照前焊缝的金相和TEM照片以及碳化物的TEM-EDX分析

图4 辐照后焊缝中的位错环分布以及尺寸和数密度统计

图5 辐照后焊缝中氦泡的分布以及尺寸和密度统计

图6 辐照剂量不同的焊缝的纳米硬度与压入深度的关系

Fluence/ions·cm^-2	0	5×10¹⁵	5×10¹⁶	1×10¹⁷
$H 0 / G P a A s - w e l d e d w e l d$	5.1	5.69	7.03	7.6
$H 0 / G P a Q u e n c h e d a n d t e m p e r e d w e l d$	3.54	3.76	4.26	4.6

表2 由Nix-Gao模型所得焊缝辐照层的真实硬度值H0

图7 焊态和调质处理态焊缝的纳米硬度与辐照损伤的关系

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