Precipitate evolution and strengthening behavior during aging process in a 2.5 GPa grade maraging steel

doi:10.1016/j.actamat.2019.08.042

CORC > 金属研究所 > 中国科学院金属研究所

	Precipitate evolution and strengthening behavior during aging process in a 2.5 GPa grade maraging steel
	Niu, Mengchao 1,2; Zhou, Gang 1; Wang, Wei 1,3; Shahzad, M. Babar 1; Shan, Yiyin 1,3; Yang, Ke 1
刊名	ACTA MATERIALIA
	2019-10-15
卷号	179 页码:296-307
关键词	Maraging steel Precipitation hardening Microstructure evolution Mechanical behavior
ISSN号	1359-6454
DOI	10.1016/j.actamat.2019.08.042
通讯作者	Wang, Wei(wangw@imr.ac.cn) ; Yang, Ke(kyang@imr.ac.cn)
英文摘要	Development of precipitation strengthening steels with ultrahigh strength and high ductility requires thorough understanding of nanoscale precipitation mechanisms. In this study, atom probe tomography (APT), HRTEM and first-principles calculations were used to reveal an interesting co-precipitation mechanism of Ni3Ti and Mo-rich nanoparticles in a 2.5 GPa grade maraging steel. The Ni-Ti rich clusters preferentially nucleate from the supersaturated solid solution and grow into Ni3Ti with extension of aging time, meanwhile the rejection of Mo atoms leads to heterogeneous precipitation of Mo-rich nanoparticles adjacent to the Ni3Ti particles and finally forms a core-shell structure along with Ni3Ti phase. Calculations of interaction energy between alloying elements in different aging process exhibit that the preferential formation of Ni-Ti rich cluster is due to the low interaction energy between Ni and Ti atoms, however, the Ni-Ti cluster is only a transitional phase, and when stable Ni3Ti is formed, Mo atoms are rejected from Ni3Ti to form a core-shell structure along with Ni3Ti precipitates. Finally, four modified theoretical prediction models are introduced to describe the yield strength as a function of microstructure and precipitates characteristics of the experimental steel. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
资助项目	Youth Innovation Promotion Association of Chinese Academy of Sciences[2017233] ; Innovation Project of Institute of Metal Research[2015-ZD04] ; National Natural Science Foundation of China Research Fund for International Young Scientists[51750110515] ; National Natural Science Foundation of China[51472249]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000488417400027
资助机构	Youth Innovation Promotion Association of Chinese Academy of Sciences ; Innovation Project of Institute of Metal Research ; National Natural Science Foundation of China Research Fund for International Young Scientists ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/135765]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wang, Wei; Yang, Ke
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Niu, Mengchao,Zhou, Gang,Wang, Wei,et al. Precipitate evolution and strengthening behavior during aging process in a 2.5 GPa grade maraging steel[J]. ACTA MATERIALIA,2019,179:296-307.
APA	Niu, Mengchao,Zhou, Gang,Wang, Wei,Shahzad, M. Babar,Shan, Yiyin,&Yang, Ke.(2019).Precipitate evolution and strengthening behavior during aging process in a 2.5 GPa grade maraging steel.ACTA MATERIALIA,179,296-307.
MLA	Niu, Mengchao,et al."Precipitate evolution and strengthening behavior during aging process in a 2.5 GPa grade maraging steel".ACTA MATERIALIA 179(2019):296-307.