Precipitation behavior of G-phase and its effect on mechanical properties of 30Cr2Ni4MoV steel

doi:10.1016/j.matchar.2024.114598

IMR OpenIR

	Precipitation behavior of G-phase and its effect on mechanical properties of 30Cr2Ni4MoV steel
	Zheng, Yongfeng 1,2; Hu, Xiaofeng 1; Jiang, Haichang 1; Song, Yuanyuan 1; Rong, Lijian 1
通讯作者	Hu, Xiaofeng(xfhu@imr.ac.cn) ; Jiang, Haichang(hcjiang@imr.ac.cn)
	2025
发表期刊	MATERIALS CHARACTERIZATION
ISSN	1044-5803
卷号	219 页码:13
摘要	Precipitation behavior of G-phase and its effect on mechanical properties of 30Cr2Ni4MoV steel during thermal aging at 350-600 degrees C for 0-10,000 h are investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), atom probe tomography (APT), hardness and impact tests. Aging at 500 degrees C, the martensitic matrix of 30Cr2Ni4MoV steel basically keeps stable. With the lath width almost remaining unchanged, carbides coarsen to a slight degree, but G-phase will precipitate at grain boundary (GB). The G-phase is Ni16Mn6Si7 and its "nose" temperature is around 500-550 degrees C. Due to relatively high enrichment level of forming elements including Ni, Mn and Si at GB, the G-phase can nucleate at triple junction or adjacent to M23C6 at GB. Subsequently, the G-phase grows along GB until contacts with M23C6, and then coarsens along the width direction, which results in alternating distribution morphology of G-phase and M23C6 at GB. The Vickers hardness results show that the hardness remains stable due to the relatively stable microstructure after aging. After aging for 10,000 h, the hardness undergoes little decrease due to the slight coarsening of M23C6 and G-phase. Interestingly, the impact energy drops obviously after the precipitation of G-phase. The reason is that the G-phase at GB promotes the initiation and propagation of cracks during the impact process, leading to intergranular fracture (IGF).
关键词	30Cr2Ni4MoV steel Precipitation behavior G -phase Mechanical property Aging embrittlement
资助者	Youth Innovation Promotion Association CAS ; LingChuang Research Project of China National Nuclear Corporation, the Experimental certification project in the pilot base ; Liaoning Unveiling and Commanding Program ; Innovation Foundation of IMR, CAS
DOI	10.1016/j.matchar.2024.114598
收录类别	SCI
语种	英语
资助项目	Youth Innovation Promotion Association CAS[Y2021059] ; LingChuang Research Project of China National Nuclear Corporation, the Experimental certification project in the pilot base[2022JH24/10200034] ; Liaoning Unveiling and Commanding Program[2022JH1/10400017] ; Innovation Foundation of IMR, CAS[2022-PY13]
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:001383371400001
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/321006/181224
专题	中国科学院金属研究所
通讯作者	Hu, Xiaofeng; Jiang, Haichang
作者单位	1.Chinese Acad Sci, CAS Key Lab Nucl Mat & Safety Assessment, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Zheng, Yongfeng,Hu, Xiaofeng,Jiang, Haichang,et al. Precipitation behavior of G-phase and its effect on mechanical properties of 30Cr2Ni4MoV steel[J]. MATERIALS CHARACTERIZATION,2025,219:13.
APA	Zheng, Yongfeng,Hu, Xiaofeng,Jiang, Haichang,Song, Yuanyuan,&Rong, Lijian.(2025).Precipitation behavior of G-phase and its effect on mechanical properties of 30Cr2Ni4MoV steel.MATERIALS CHARACTERIZATION,219,13.
MLA	Zheng, Yongfeng,et al."Precipitation behavior of G-phase and its effect on mechanical properties of 30Cr2Ni4MoV steel".MATERIALS CHARACTERIZATION 219(2025):13.