Simultaneously achieving high mechanical properties and oxidation resistance of 9Cr ODS Fe-based superalloy at elevated temperature via Al and Si-alloying

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-05-08 DOI:10.1016/j.matchar.2025.115144

Mingsheng Yang, Jikang Li, Shengjie Dong, Tong Liu

{"title":"Simultaneously achieving high mechanical properties and oxidation resistance of 9Cr ODS Fe-based superalloy at elevated temperature via Al and Si-alloying","authors":"Mingsheng Yang, Jikang Li, Shengjie Dong, Tong Liu","doi":"10.1016/j.matchar.2025.115144","DOIUrl":null,"url":null,"abstract":"<div><div>Developing 9Cr oxide dispersion-strengthened (ODS) Fe-based superalloy combining elevated-temperature strength and oxidation resistance was a challenge for advanced nuclear applications. A new 9Cr ODS ferrite-martensite superalloy was designed via Al- and Si-alloying, aiming to improve the comprehensive performance at elevated temperatures. The microstructure, mechanical properties and oxidation resistance of 9Cr ODS superalloy were investigated in detail. 1.5Al1Si (1.5 wt% Al and 1 wt% Si) alloy achieved the simultaneous improvement of mechanical properties and oxidation resistance compared with other alloys at elevated temperatures. Multi-scale characterization revealed that the 1.5Al1Si alloy exhibited a refined dual-phase ferritic-martensitic structure (average grain size: 1.47 μm) with coherent Y<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> nanoparticles (8.9 ± 2.6 nm), enabling the high tensile strength (648 MPa) at 550 °C. Al and Si co-addition promoted the preferential formation of a continuous Cr<sub>2</sub>O<sub>3</sub> layer after exposure to air at 850 °C for 200 h. Benefiting from the a concrete Cr<sub>2</sub>O<sub>3</sub> protective layer, the oxide scale of 1.5Al1Si alloy did not spall, with the weight gain was only 0.79 mg/cm<sup>2</sup>. Our work demonstrated that the Al and Si co-alloying was an effective way to improve the comprehensive performance of 9Cr ODS superalloy at elevated temperature.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"225 ","pages":"Article 115144"},"PeriodicalIF":4.8000,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Characterization","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1044580325004334","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CHARACTERIZATION & TESTING","Score":null,"Total":0}

引用次数: 0

Abstract

Developing 9Cr oxide dispersion-strengthened (ODS) Fe-based superalloy combining elevated-temperature strength and oxidation resistance was a challenge for advanced nuclear applications. A new 9Cr ODS ferrite-martensite superalloy was designed via Al- and Si-alloying, aiming to improve the comprehensive performance at elevated temperatures. The microstructure, mechanical properties and oxidation resistance of 9Cr ODS superalloy were investigated in detail. 1.5Al1Si (1.5 wt% Al and 1 wt% Si) alloy achieved the simultaneous improvement of mechanical properties and oxidation resistance compared with other alloys at elevated temperatures. Multi-scale characterization revealed that the 1.5Al1Si alloy exhibited a refined dual-phase ferritic-martensitic structure (average grain size: 1.47 μm) with coherent Y₂Ti₂O₇ nanoparticles (8.9 ± 2.6 nm), enabling the high tensile strength (648 MPa) at 550 °C. Al and Si co-addition promoted the preferential formation of a continuous Cr₂O₃ layer after exposure to air at 850 °C for 200 h. Benefiting from the a concrete Cr₂O₃ protective layer, the oxide scale of 1.5Al1Si alloy did not spall, with the weight gain was only 0.79 mg/cm². Our work demonstrated that the Al and Si co-alloying was an effective way to improve the comprehensive performance of 9Cr ODS superalloy at elevated temperature.

Abstract Image

查看原文本刊更多论文

同时通过Al和si合金化获得9Cr ODS铁基高温合金在高温下的高力学性能和抗氧化性能

开发具有高温强度和抗氧化性能的9Cr氧化物分散强化（ODS）铁基高温合金是先进核应用面临的挑战。为提高9Cr ODS铁素体-马氏体高温合金的综合高温性能，采用Al- si合金化方法设计了一种新型9Cr ODS铁素体-马氏体高温合金。研究了9Cr ODS高温合金的显微组织、力学性能和抗氧化性能。与其他合金相比，1.5 al1si （1.5 wt% Al和1 wt% Si）合金在高温下的力学性能和抗氧化性能同时得到改善。多尺度表征表明，1.5Al1Si合金具有细化的双相铁素体-马氏体组织（平均晶粒尺寸为1.47 μm），并具有共格的Y2Ti2O7纳米颗粒（8.9±2.6 nm），在550℃下具有较高的抗拉强度（648 MPa）。Al和Si共添加有利于在850℃空气中暴露200 h后形成连续的Cr2O3层。得益于混凝土Cr2O3保护层，1.5Al1Si合金的氧化皮没有剥落，增重仅为0.79 mg/cm2。研究表明，Al和Si共合金化是提高9Cr ODS高温合金高温综合性能的有效途径。

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分钟内获得全文求助全文

来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.