EFFECTS OF Al AND Si ON MECHANICAL PROPERTIES AND CORROSION RESISTANCE IN LIQUID Pb-Bi EUTECTIC OF 9Cr2WVTa STEEL

doi:10.11900/0412.1961.2015.00348

Acta Metall Sin

2016, Vol. 52

Issue (3): 298-306 DOI: 10.11900/0412.1961.2015.00348

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EFFECTS OF Al AND Si ON MECHANICAL PROPERTIES AND CORROSION RESISTANCE IN LIQUID Pb-Bi EUTECTIC OF 9Cr2WVTa STEEL

Yanhong LU,Yuanyuan SONG,Shenghu CHEN,Lijian Rong(

)

Key Laborotary of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy ofSciences, Shenyang 110016, China

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Yanhong LU, Yuanyuan SONG, Shenghu CHEN, Lijian Rong. EFFECTS OF Al AND Si ON MECHANICAL PROPERTIES AND CORROSION RESISTANCE IN LIQUID Pb-Bi EUTECTIC OF 9Cr2WVTa STEEL. Acta Metall Sin, 2016, 52(3): 298-306.

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Abstract

9Cr2WVTa steel is one kind of reduced activation ferritic/martensitic (RAFM) steels, which are considered as the candidate structural materials for the accelerator driven subcritical system (ADS). Effects of Al and Si on the microstructure, tensile properties, impact toughness and corrosion behavior in liquid lead-bismuth eutectic (LBE) of 9Cr2WVTa steels were investigated by SEM, TEM, EPMA and micro hardness tester. The results showed that the addition of Al and Si promoted the formation of δ-ferrite, and Al was a much stronger ferrite stabilizer than Si. The presence of δ-ferrite significantly degraded the impact toughness of 9Cr2WVTa steels. M₂₃C₆carbides were observed to precipitate at the δ-ferrite grain boundaries, and stress concentrations were created at the carbide/matrix interface, resulting in the intergranular cracking after deformation. Static corrosion tests were conducted in oxygen-saturated LBE at 550 ℃ for 5000 h to study the effects of Al and Si on the corrosion behaviors in LBE. It is shown that the addition of Al and Si improved the corrosion resistance in LBE due to that appreciable enrichments of Al and Si in inner oxide layer increased the compactness of oxide layer and reduced the diffusion rates of alloy elements and oxygen atoms.

Key words: 9Cr2WVTa impact property Al Si Pb-Bi corrosion

Received: 03 July 2015

Fund: Supported by National Natural Science Foundation of China (No.91226204) and Strategic Priority Program of the Chinese Academy of Sciences (No XDA03010304)

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	Lijian Rong

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00348 OR https://www.ams.org.cn/EN/Y2016/V52/I3/298

Table 1 Chemical compositions of four alloys
(mass fraction / %)

Fig.1 SEM images of alloys No.1 (a), No.2 (b), No.3 (c) and No.4 (d) after quenching and tempering treatment (Insets show the corresponding magnified images of rectangular areas)

Fig.2 TEM images of alloys No.1 (a) and No.4 (b) after quenching and tempering treatment

Fig.3 Temperatures dependence of the precipitation of quantity of phases in the alloys No.1 (a), No.2 (b), No.3 (c) and No.4 (d) calculated by Therm-Calc under thermal equilibrium conditions

Fig.4 Room temperature tensile properties of alloys No.1~No.4 after quenching and tempering treatment (σ_0.2--yield strength, σ_b--tensile strength, δ--elongation)

Fig.5 Fracture surface SEM images of alloys No.1 (a), No.2 (b), No.3 (c) and No.4 (d) after impact at room temperature

Fig.6 Cross sectional SEM images near the impact fracture surface of quenching and tempering treatment alloys No.1 (a) and No.2 (b) at room temperature (Inset shows the corresponding magnified image of rectangular area, arrows show the positions of void formed)

Fig.7 Elevated temperature mechanical properties of alloys No.1 (a) and No.4 (b) after quenching and tempering treatment

Fig 8 Thickness of oxide layer in alloys No.1 and No.4 as a function of exposure duration up to 5000 h in liquid Pb-Bi eutectic alloy

Fig 9 Cross sectional SEM images of alloys No.1 (a, c) and No.4 (b, d) corroded for 1500 h (a, b) and 5000 h (c, d) in liquid Pb-Bi eutectic alloy (a--grey zone, b--light-grey zone, c--taupe-coloured sub-layer, 1--steel matrix, 2--oxygen diffusion zone, 3--internal oxide layer, 4--outer oxide layer, 5--Pb-Bi)

Fig 10 Distributions of elements in the oxide layer of alloys No.1 (a) and No.4 (b) samples exposed at 550 ℃ for 1500 h in liquid Pb-Bi eutectic alloy

Fig 11 Vickers hardness profile of the oxide layer of alloys No.1 (a) and No.4 (b) exposed at 550 ℃ for 5000 h in liquid Pb-Bi eutectic alloy (IOZ—internal oxidation zone)

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