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Effect of thermal aging at 550 & DEG;C on microstructure and mechanical properties of a 9Cr martensitic steel with high silicon content

文献类型：期刊论文

作者Zhang, Qiankun1,2; Hu, Xiaofeng1; Jiang, Haichang1; Yan, Chunguang3; Rong, Lijian1
刊名MATERIALS CHARACTERIZATION
出版日期2023-09-01
卷号203页码:11
关键词Thermal aging Si Laves phase Mechanical properties
ISSN号1044-5803
DOI10.1016/j.matchar.2023.113045
通讯作者Hu, Xiaofeng(xfhu@imr.ac.cn)
英文摘要Effect of thermal aging at 550 & DEG;C on microstructure and mechanical properties of a 9Cr martensitic steel with high silicon content (named as H-Si steel) was investigated by field emission scanning electron microscopy (FESEM), electron backscattered diffraction (EBSD), transmission electron microscopy (TEM) and tensile and impact test. During aging, the martensitic matrix (including lath size, effective grain size and high angle boundaries) basically keeps stable. The M23C6 in H-Si steel gradually coarsens with increasing aging time and the morphology of M23C6 on grain boundary tends to be chain-shaped, and then gradually becomes discrete again. Meanwhile, the Laves phase will precipitate adjacent to M23C6 due to a Si-rich layer around M23C6 and coarsens quickly before aging for 3000 h. With further increasing aging time, Laves phase is stable with a size of about 136 nm. The mechanical properties test results show that yield strength and elongation have little change during aging. However, the impact energy of H-Si steel drops obviously after precipitation of Laves phase and the impact fracture presents cleavage fracture morphology. When the aging time is over 3000 h, the coarsening rate of Laves phase is very low and the H-Si steel exhibits a relatively stable impact energy about 113 J. After aging up to 10,000 h, H-Si steel still has excellent comprehensive mechanical properties.
资助项目LingChuang Research Project of China National Nuclear Corporation ; Youth Innovation Promotion Association CAS[Y2021059] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA28040200]
WOS研究方向Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
WOS记录号WOS:001017509600001
出版者ELSEVIER SCIENCE INC
资助机构LingChuang Research Project of China National Nuclear Corporation ; Youth Innovation Promotion Association CAS ; Strategic Priority Research Program of the Chinese Academy of Sciences
源URL[http://ir.imr.ac.cn/handle/321006/178354]  
专题金属研究所_中国科学院金属研究所
通讯作者Hu, Xiaofeng
作者单位1.Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
3.China Inst Atom Energy CIAE, Beijing 102413, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Qiankun,Hu, Xiaofeng,Jiang, Haichang,et al. Effect of thermal aging at 550 & DEG;C on microstructure and mechanical properties of a 9Cr martensitic steel with high silicon content[J]. MATERIALS CHARACTERIZATION,2023,203:11.
APA Zhang, Qiankun,Hu, Xiaofeng,Jiang, Haichang,Yan, Chunguang,&Rong, Lijian.(2023).Effect of thermal aging at 550 & DEG;C on microstructure and mechanical properties of a 9Cr martensitic steel with high silicon content.MATERIALS CHARACTERIZATION,203,11.
MLA Zhang, Qiankun,et al."Effect of thermal aging at 550 & DEG;C on microstructure and mechanical properties of a 9Cr martensitic steel with high silicon content".MATERIALS CHARACTERIZATION 203(2023):11.

入库方式： OAI收割

来源：金属研究所

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