Interactive effect of thermal aging and proton irradiation on microstructural evolution and hardening of δ-ferrite in 308L stainless steel weld metal

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外文摘要：In the harsh service environment of high temperature and intense neutron irradiation in water-cooled nuclear reactors,the austenitic stainless steel weld overlay cladding on the inner surface of the reac-tor pressure vessel suffers from thermal aging and irradiation damage simultaneously,which can induce microstructural evolution and hardening of the material.Since it is quite difficult to achieve this simul-taneous process out of the pile,two kinds of combined experiments,i.e.,post-irradiation thermal aging and post-aging irradiation were performed on 308 L stainless steel weld metals in this work.The in-teractive effect of thermal aging and proton irradiation on microstructural evolution and hardening ofδ-ferrite in 308 L weld metal was investigated by combining atom probe tomography,transmission elec-tron microscopy and nanoindentation tests.The results revealed that thermal aging could eliminate the dislocation loops induced by irradiation and affect the phase transition process by accelerating spinodal decomposition and G-phase precipitation,thus enhancing hardening of irradiated δ-ferrite.For the ef-fect of irradiation on the microstructure and hardening of thermally aged δ-ferrite,however,intensive collision cascades can intensify G-phase precipitation and dislocation loop formation but decrease spin-odal decomposition,leading to a limited effect on hardening of thermally aged δ-ferrite.Furthermore,the interaction of thermal aging and irradiation can promote G-phase precipitation.Meanwhile,the interac-tion can cause 8-ferrite hardening,which is mainly influenced by spinodal decomposition,followed by G-phase and dislocation loops,where spinodal decomposition and G-phase cause hardening by inducing strain fields.

外文关键词：

Austenitic stainless steel weld metalsThermal agingProton irradiationInteractionMicrostructural evolutionHardening

作者：

Xiaodong Gao、Xiaodong Lin、Tao Guo、Lining Xu、Yaolei Han、Baolong Jiang、Xingyuan Mei、Qunjia Peng、Lijie Qiao

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作者单位：

Beijing Advanced Innovation Center for Materials Genome Engineering,Institute of Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China

Institute of Materials,Shanghai University,Shanghai 200072,China

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

Suzhou Nuclear Power Research Institute,Suzhou 215004,China

State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China

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基金：

国家自然科学基金

项目编号：

52071018

出版年：

2024

DOI：

10.1016/j.jmst.2023.06.030

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCD

影响因子：0.657

ISSN：1005-0302

年,卷(期)：2024.170(3)

参考文献量71