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

doi:10.11901/1005.3093.2021.451

Chinese Journal of Materials Research

2022, Vol. 36

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

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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

Cite this article:

LIU Dan, LEI Yucheng, ZHANG Weiwei, LI Tianqing, YAO Yiqiang, DING Xiangbin. Effect of He Ion Irradiation on Microstructure and Properties of CLAM Steel Weld. Chinese Journal of Materials Research, 2022, 36(8): 609-616.

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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

Received: 13 August 2021

ZTFLH:

TL341

Fund: National Natural Science Foundation of China(51875264)

About author: LEI Yucheng, Tel: (0511)88790798, E-mail: yclei@ujs.edu.cn

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	Dan LIU
	Yucheng LEI
	Weiwei ZHANG
	Tianqing LI
	Yiqiang YAO
	Xiangbin DING

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.451 OR https://www.cjmr.org/EN/Y2022/V36/I8/609

Table 1 Chemical composition of CLAM steel (mass fraction, %)

Fig.1 Variation curve of irradiation damage with ion implantation depth

Fig.2 SEM morphological changes of two kinds of weld surfaces under different irradiation doses (a, c, e, g) 0, 5×10¹⁵, 5×10¹⁶, 1×10¹⁷ ions·cm^-2 of as-welded welds; (b, d, f, h) 0, 5×10¹⁵, 5×10¹⁶, 1×10¹⁷ ions·cm^-2 of quenched and tempered welds

Fig.3 Optical and TEM microstructure observation of welds and TEM-EDX analysis of carbides before irradiation (a, c) as-welded weld; (b, d) quenched and tempered weld; (e) Cr-rich M₂₃C₆ carbides; (f) Ta-rich MC particles

Fig.4 Dislocation loops distribution and size and number density statistics of irradiated welds (a, c, e) as-welded welds; (b, d, f)quenched and tempered welds

Fig.5 Helium bubbles distribution and size and number density statistics of irradiated welds (a, c) as-welded welds;(b, d)quenched and tempered welds

Fig.6 Nano-hardness vs. indentation depth after different implanted ion fluence (a, c) as-welded welds; (b, d) quenched and tempered welds

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

Table 2 The real hardness value H₀ of welds' irradiated layer based on the Nix-Gao model

Fig.7 Relationship between nano-hardness value of as-welded and quenched and tempered welds and irradiation damage

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