Irradiation Hardening and Defects Distribution in CLAM Steel under Deuterium and Helium Ion Irradiation

doi:10.11901/1005.3093.2015.529

Chinese Journal of Materials Research

2016, Vol. 30

Issue (9): 641-648 DOI: 10.11901/1005.3093.2015.529

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Irradiation Hardening and Defects Distribution in CLAM Steel under Deuterium and Helium Ion Irradiation

Zhenyu FU,Zequn WANG,Pingping LIU,Yinping WEI,Farong WAN,Qian ZHAN

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

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Zhenyu FU,Zequn WANG,Pingping LIU,Yinping WEI,Farong WAN,Qian ZHAN. Irradiation Hardening and Defects Distribution in CLAM Steel under Deuterium and Helium Ion Irradiation. Chinese Journal of Materials Research, 2016, 30(9): 641-648.

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Abstract

The irradiation behavior of a China low activation martensitic (CLAM) steel was investigated by advanced transmission electron microscopy combined with nano-indentation measurement. The CLAM steel was irradiated by single-(D⁺), single-(He⁺) and sequential-(D⁺ plus He⁺ subsequently) ions respectively at room temperature. The nano-indentation hardness results show that all of the irradiated specimens exhibited obvious hardening. The irradiation hardening rate was obtained for each specimens by fitting the experimental data using the modified NGK model, in which D⁺ implanted samples had the lowest radiation hardening level while the one for He⁺ injection and D⁺ + He⁺ implanted samples were significant. The microstructure analysis indicates that the defect density gradually increased first and then decreased along the implantation depth direction. High-density irradiation induced defects were present at the vicinity of the implantation peak depth. Homogeneously distributed fine bubbles were observed in both single-(He⁺) and sequential-(D⁺ plus He⁺ subsequently) irradiated samples with the bubble appearance at shallower depth for the latter ones because of the synergistic effect. No bubbles were found in single-(D⁺) irradiated samples. The hardening rate of He⁺ implanted samples, in which both dislocation loops and helium bubbles occurred, is greater than D⁺ implanted samples. In D⁺+He⁺ irradiated samples, certain defects occurred by D⁺ will recover when the samples are being irradiated by He⁺. Therefore, the hardening rate of D⁺+He⁺ irradiated samples is not equivalent to the rate of D⁺ irradiated samples plus He⁺ irradiated samples. Irradiation hardening results from the synergistic reaction.

Key words: metallic materials CLAM steel irradiation effect defects distribution bubble

Received: 07 September 2015

Fund: *Supported by National Magnetic Con?nement Fusion Program Nos 2014GB104003 & 2014GB120001, National Natural Science Foundation of China No 51371031

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	Zhenyu FU
	Zequn WANG
	Pingping LIU
	Yinping WEI
	Farong WAN
	Qian ZHAN

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.529 OR https://www.cjmr.org/EN/Y2016/V30/I9/641

Table 1 Irradiation condition

Fig.1 DPA and ion concentration curves based on SRIM (a) D⁺ irradiation; (b) He⁺ irradiation

Fig.2 Cross section and top view of indenter

Fig.3 Nano hardness curves of irradiated and unirradiated CLAM

Table 2 H_L, H_s based on NGK model

Fig.4 NGK model fitting curves of irradiated CLAM steel (a) D⁺ irradiated; (b) He⁺ irradiated; (c) D⁺+He⁺ irradiated

Fig.5 TEM image of microstructure in unirradiated CLAM steel (a); EDPs of M₂₃C₆ (b) and MC (c)

Fig.6 Cross-section TEM image of CLAM after D⁺ irradiation

Fig.7 Cross-section TEM image of microstructure in CLAM after He⁺ irradiation (a, b), and corresponding to different depth area (c-f)

Fig.8 Cross-section TEM images of CLAM after H⁺+ He⁺ irradiation (a), and microstructures of different depth area (b-d)

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