Combined impact of creep aging and helium ion irradiation on P91 steel: Experiments and FE modelling

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Science and Engineering: A Pub Date : 2025-03-17 DOI:10.1016/j.msea.2025.148219

Tao Wei, Alan Xu, Hanliang Zhu, Michael Drew, Tim Nicholls, Ondrej Muránsky

{"title":"Combined impact of creep aging and helium ion irradiation on P91 steel: Experiments and FE modelling","authors":"Tao Wei, Alan Xu, Hanliang Zhu, Michael Drew, Tim Nicholls, Ondrej Muránsky","doi":"10.1016/j.msea.2025.148219","DOIUrl":null,"url":null,"abstract":"<div><div>Understanding radiation damage resistance in Grade 91 steel (P91) is essential for the development of materials for future nuclear components. This study explores the combined effects of creep aging and helium ion irradiation on the microstructure and mechanical properties of P91 steel. Creep aging was conducted under a stress of 110 MPa at 625 °C for 475 h, followed by irradiation with 5 MeV helium ions to a fluence of 5.6 × 10<sup>17</sup> ions/cm<sup>2</sup>, creating a uniform radiation-affected zone with an average damage level of 0.6 dpa. Microstructural changes and mechanical responses were assessed through detailed microstructural observations and nanoindentation, supported by finite element modelling. The results show that creep aging led to a slight reduction in hardness from 2.66 GPa to 2.45 GPa, primarily due to carbide coarsening. Significant irradiation hardening was observed, with hardness increasing by 87 % in the as-received condition and by 99 % in the creep-aged condition. A three-dimensional finite element model was developed to reverse-engineer stress-strain relationship from nanoindentation load-displacement data. This study underscores the significant impact of combined creep aging and irradiation on P91 steel, with important implications for its use in nuclear applications.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"931 ","pages":"Article 148219"},"PeriodicalIF":7.0000,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Science and Engineering: A","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0921509325004435","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Understanding radiation damage resistance in Grade 91 steel (P91) is essential for the development of materials for future nuclear components. This study explores the combined effects of creep aging and helium ion irradiation on the microstructure and mechanical properties of P91 steel. Creep aging was conducted under a stress of 110 MPa at 625 °C for 475 h, followed by irradiation with 5 MeV helium ions to a fluence of 5.6 × 10¹⁷ ions/cm², creating a uniform radiation-affected zone with an average damage level of 0.6 dpa. Microstructural changes and mechanical responses were assessed through detailed microstructural observations and nanoindentation, supported by finite element modelling. The results show that creep aging led to a slight reduction in hardness from 2.66 GPa to 2.45 GPa, primarily due to carbide coarsening. Significant irradiation hardening was observed, with hardness increasing by 87 % in the as-received condition and by 99 % in the creep-aged condition. A three-dimensional finite element model was developed to reverse-engineer stress-strain relationship from nanoindentation load-displacement data. This study underscores the significant impact of combined creep aging and irradiation on P91 steel, with important implications for its use in nuclear applications.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

蠕变时效与氦离子辐照对P91钢的联合影响：试验与有限元模拟

了解91级钢（P91）的抗辐射损伤性能对未来核部件材料的开发至关重要。研究了蠕变时效和氦离子辐照对P91钢组织和力学性能的综合影响。在625℃、110 MPa的应力条件下，进行475 h的蠕变时效，然后用5 MeV的氦离子辐照，辐照量为5.6 × 1017个离子/cm2，形成均匀的辐射影响区，平均损伤水平为0.6 dpa。通过详细的微观结构观察和纳米压痕来评估微观结构变化和力学响应，并辅以有限元模型。结果表明：蠕变时效使合金的硬度从2.66 GPa略微降低到2.45 GPa，主要原因是碳化物的粗化；观察到明显的辐照硬化，硬度在接收条件下提高了87%，在蠕变时效条件下提高了99%。利用纳米压痕载荷-位移数据建立三维有限元模型，对应力-应变关系进行逆向工程。本研究强调了蠕变时效和辐照对P91钢的显著影响，对其在核应用中的应用具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.