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A Study on the Aging Behavior of Nitrided W18Cr4V Steel in High-Temperature Sodium

The loading and unloading elevators are the primary equipment in the refueling system, used for transferring fuel assemblies in the sodium-cooled fast reactors. The guideway friction pairs are the critical components of these elevators in the refueling system. With the excellent hardness and wear re...

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Published in:Metals (Basel ) 2024-03, Vol.14 (3), p.357
Main Authors: Fu, Xiaogang, Liang, Na, Zhang, Wei, Tao, Liu, Qin, Bo, Ruan, Zhangshun, Long, Bin, Lv, Shasha
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container_title Metals (Basel )
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creator Fu, Xiaogang
Liang, Na
Zhang, Wei
Tao, Liu
Qin, Bo
Ruan, Zhangshun
Long, Bin
Lv, Shasha
description The loading and unloading elevators are the primary equipment in the refueling system, used for transferring fuel assemblies in the sodium-cooled fast reactors. The guideway friction pairs are the critical components of these elevators in the refueling system. With the excellent hardness and wear resistance in air, nitrided W18Cr4V steel is a promising material for the guideway friction pairs. In order to assess the feasibility of using nitrided W18Cr4V steel, it is essential to understand the aging behavior of nitrided W18Cr4V steel in high-temperature sodium. Aging tests were conducted on nitrided W18Cr4V steel in sodium and in argon environments at various temperatures for different exposure times. The results showed that the nitrogen atoms in the nitrided layer exhibited bidirectional diffusion behavior in the sodium or argon environment at 540 °C. Compared to the argon environment, cracks formed within the nitrided layer and the diffusion of nitrogen into the sodium was accelerated in the nitrided layer. As a significant number of nitrogen atoms had diffused into the sodium, there was little difference in the hardness between nitrided W18Cr4V steel and non-nitrided W18Cr4V steel after long-term exposure to 540 °C sodium.
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The guideway friction pairs are the critical components of these elevators in the refueling system. With the excellent hardness and wear resistance in air, nitrided W18Cr4V steel is a promising material for the guideway friction pairs. In order to assess the feasibility of using nitrided W18Cr4V steel, it is essential to understand the aging behavior of nitrided W18Cr4V steel in high-temperature sodium. Aging tests were conducted on nitrided W18Cr4V steel in sodium and in argon environments at various temperatures for different exposure times. The results showed that the nitrogen atoms in the nitrided layer exhibited bidirectional diffusion behavior in the sodium or argon environment at 540 °C. Compared to the argon environment, cracks formed within the nitrided layer and the diffusion of nitrogen into the sodium was accelerated in the nitrided layer. 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subjects Aging
Aging (metallurgy)
aging behavior
Alcohol
Argon
Atomic properties
Critical components
Diffusion layers
Elevators & escalators
fast reactor
Friction
Guideways
Hardness
Heat resistance
Heat resistant steels
High temperature
high-temperature sodium
Manufacturing
nitrided W18Cr4V steel
Nitriding
Nitrogen
Nitrogen atoms
Nuclear energy
Nuclear reactors
Reactors
Refueling
Sodium
Sodium cooled reactors
Steel
Temperature
Wear resistance
title A Study on the Aging Behavior of Nitrided W18Cr4V Steel in High-Temperature Sodium
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