Progress of Small Punch Test Technique and Its Application in Detecting Embrittlement Effect of Molten Lead-bismuth on Metallic Materials

doi:10.11902/1005.4537.2023.207

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (3): 567-575 DOI: 10.11902/1005.4537.2023.207

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Progress of Small Punch Test Technique and Its Application in Detecting Embrittlement Effect of Molten Lead-bismuth on Metallic Materials

HE Yajie, CHEN Lingzhi, RUAN Zhangshun, FU Xiaogang, JI Cheng, LONG Bin(

)

Division of Reactor Engineering Technology Research, China Institute of Atomic Energy, Beijing 102413, China

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HE Yajie, CHEN Lingzhi, RUAN Zhangshun, FU Xiaogang, JI Cheng, LONG Bin. Progress of Small Punch Test Technique and Its Application in Detecting Embrittlement Effect of Molten Lead-bismuth on Metallic Materials. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 567-575.

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Abstract

Lead-cooled fast reactor is a promising reactor type of the fourth-generation reactors. In the design of the cladding material, it is necessary to pay attention to the compatibility of the cladding material with the molten Pb-Bi alloy, and its resistance to liquid metal corrosion, especially, the properties of structural materials will be significantly degraded by the synergistic action of corrosive molten Pb-Bi alloy and external stress. The Small Punch Test (SPT) is a testing method, that uses a small size sample to assess the changes in the mechanical properties of a structural material in service conditions. This method can extract samples directly from the structural material in use without compromising its integrity. Therefore, the SPT is very suitable for situations where the number of materials under study is limited or where materials in service are studied. This paper briefly introduces the SPT technique, summarizes the research on the correlation between the SPT and the standard size test at home and abroad, expounds the research on mechanical properties of key materials by using small punch technique, especially expounds the application of SPT in the study of liquid metal embrittlement effect (LME) of structural materials. The results can provide technical methods and theoretical support for the application of small punch technique in the study of liquid Pb-Bi alloy induced embrittlement of engineering materials.

Key words: small punch test (SPT) structural material mechanical property liquid metal embrittlement (LME)

Received: 30 June 2023 32134.14.1005.4537.2023.207

ZTFLH:

TL341

Fund: National Magnetic Confinement Nuclear Fusion Energy Development Research Project(2022YFE03120001);National Atomic Energy Agency Nuclear Materials Technology Innovation Center(ICNM-2023-ZH-07)

Corresponding Authors: LONG Bin, E-mail: binlong@ciae.ac.cn

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	HE Yajie
	CHEN Lingzhi
	RUAN Zhangshun
	FU Xiaogang
	JI Cheng
	LONG Bin

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.207 OR https://www.jcscp.org/EN/Y2024/V44/I3/567

Fig.1 Characteristic load-displacement curves of SPT standard penetration test^[9]

Fig.2 Punch diagram: (a) hemispherical punch, (b) spherical punch^[10]

Fig.3 Diagram for determination of F_y^[8]

Fig.4 SEM fracture images of a SPF test on a Ti-6Al-4V specimen: (a) macro fracture of SPT test sample, (b) fatigue fringe of uniaxial strain fatigue test sample, (c, d) fracture strip of SPT test sample^[26]

Fig.5 Load-displacement curves of unirradiated and neutron-irradiated T91 steel at 200^oC^[5]

Fig.6 Figure of small punch test device^[29]

Fig.7 Load-displacement curves of SPT samples of T91 steel treated at 300^oC in air (a) and LBE (b)^[29]

Fig.8 Load-displacement curves (a) and fracture images (b, c, d) of T91 steel in oxygen saturated LBE at 300^oC under the loading rates of 0.05 mm/min (b1, b2), 0.005 mm/min (c1, c2) and 0.0005 mm/min (d1, d2)^[4]

Table 1 Oxidation products of T91 steel under different conditions

Fig.9 SPT curves of T91 steel at 250^oC (a) and 300^oC (d), and fracture surface morphologies (b, c, e, f) for DNO2 (b), D0.5O2 (c) and D4O2 (e) oxidized at 300^oC, and for DAO2 oxidized at 250^oC (f)^[32]

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