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

doi:10.1016/j.matchar.2023.113045

IMR OpenIR

	Effect of thermal aging at 550 & DEG;C on microstructure and mechanical properties of a 9Cr martensitic steel with high silicon content
	Zhang, Qiankun 1,2; Hu, Xiaofeng 1; Jiang, Haichang 1; Yan, Chunguang 3; Rong, Lijian 1
通讯作者	Hu, Xiaofeng(xfhu@imr.ac.cn)
	2023-09-01
发表期刊	MATERIALS CHARACTERIZATION
ISSN	1044-5803
卷号	203 页码:11
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.
关键词	Thermal aging Si Laves phase Mechanical properties
资助者	LingChuang Research Project of China National Nuclear Corporation ; Youth Innovation Promotion Association CAS ; Strategic Priority Research Program of the Chinese Academy of Sciences
DOI	10.1016/j.matchar.2023.113045
收录类别	SCI
语种	英语
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
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
WOS记录号	WOS:001017509600001
出版者	ELSEVIER SCIENCE INC
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/178355
专题	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.