Effects of matrix and dendrite boundary composition on stress corrosion cracking performance of Alloy 52M buttering layer in simulated PWR primary water

Ma, Jiarong; Xiong, Qi; Xu, Xinhe; Cui, Tongming; Lu, Zhanpeng; Shoji, Tetsuo

doi:10.5006/4392

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Research Article| November 16 2023

Effects of matrix and dendrite boundary composition on stress corrosion cracking performance of Alloy 52M buttering layer in simulated PWR primary water

Jiarong Ma;

Jiarong Ma

*Institute of Materials, School of Materials Scienceand Engineering, Shanghai University, Shanghai,200072, China

**State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai, 200072, China

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Qi Xiong;

Qi Xiong

*Institute of Materials, School of Materials Scienceand Engineering, Shanghai University, Shanghai,200072, China

**State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai, 200072, China

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Xinhe Xu;

Xinhe Xu

*Institute of Materials, School of Materials Scienceand Engineering, Shanghai University, Shanghai,200072, China

**State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai, 200072, China

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Tongming Cui;

Tongming Cui

*Institute of Materials, School of Materials Scienceand Engineering, Shanghai University, Shanghai,200072, China

**State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai, 200072, China

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Zhanpeng Lu;

Zhanpeng Lu #

*Institute of Materials, School of Materials Scienceand Engineering, Shanghai University, Shanghai,200072, China

**State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai, 200072, China

#Corresponding author: +86-21-56336107; Email: zplu@t.shu.edu.cn.

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Tetsuo Shoji

***New Industry Creation Hatchery Center, Tohoku University, Sendai, 980-8579, Japan

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CORROSION 4392.

https://doi.org/10.5006/4392

ABSTRACT

The oxidation and stress corrosion cracking (SCC) behaviors of Alloy 52M buttering (52Mb) layer were studied in simulated pressurized water reactor (PWR) primary water after microstructure characterization. The 52Mb layer was first post-weld heat treatment (1st-PWHT) and follow-up PWHT (FU-PWHT). Two dilution zones (DZs) were found in both the 1st-PWHT and FU-PWHT 52Mb samples. FU-PWHT decreased the Cr content in the first dilution zone, enhancing the oxidation rate and accelerating the formation of the local oxidation penetration zone at the oxide/substrate interface. Lower Cr content and high Fe content in the dilution zone were detrimental to the SCC resistance of the 52Mb in PWR primary water.

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Effects of matrix and dendrite boundary composition on stress corrosion cracking performance of Alloy 52M buttering layer in simulated PWR primary water

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