Serrated grain boundary formation and its effect on the hydrogen embrittlement of Fe-Ni based alloy

doi:10.1016/j.msea.2024.147582

IMR OpenIR

	Serrated grain boundary formation and its effect on the hydrogen embrittlement of Fe-Ni based alloy
	Hu, Honglei 1,2; Zhao, Mingjiu 2; Song, Yuanyuan 2; Rong, Lijian 2
通讯作者	Zhao, Mingjiu(mjzhao@imr.ac.cn) ; Rong, Lijian(ljrong@imr.ac.cn)
	2025
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	921 页码:11
摘要	Random grain boundary (RGB) is always regarded as a weakness for hydrogen-induced intergranular cracking. Transforming straight RGB into serrated grain boundary (SGB) has long been considered as a method to improve the mechanical properties of alloys. However, the formation mechanism of SGBs and their impact on hydrogeninduced intergranular cracking in Fe-Ni based alloy remains unclear. This study investigates the grain boundary (GB) serration in Fe-Ni based alloy through various heat treatments. SGBs are formed after slow cooling treatment following air cooling without q phases. The average amplitude of the SGBs is approximately 0.36 +/- 0.04 mu m, decreasing to 0.22 +/- 0.03 mu m as the cooling rate increases from 1 degrees C/min to 6 degrees C/min. A mechanism for GB serration is proposed which is associated with preferential growth of y ' precipitates towards GBs during air cooling rather than slow cooling. Moreover, GB serration predominantly occurs at RGBs near the triple junctions and occasionally at E9 and E27 boundaries, but generally not at coherent E3 boundaries. This behavior can be attributed to the influence of boundary structure on the segregation and diffusion of Ni, Ti and Al atoms, which affects the precipitation and growth of y ' phase. Hydrogen-induced intergranular cracking preferentially initiated and grew at straight RGBs. The specimen with SGBs showed higher resistance to hydrogen-induced intergranular cracking than that with straight GBs due to a lower resolved tensile stress normal to the GB.
关键词	Grain boundary serration Fe-Ni based alloy Atom probe tomography Hydrogen embrittlement Intergranular cracking
资助者	National Key Research and Development Program of China ; Natural Science Foundation of Shanghai ; Three-year Action Plan of Shanghai Science and Technology Commission ; State Key Laboratory of Compressor Technology (ANHUI Laboratory of Compressor Technology)
DOI	10.1016/j.msea.2024.147582
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program of China[2019YFB1505201] ; Natural Science Foundation of Shanghai[21ZR1424600] ; Three-year Action Plan of Shanghai Science and Technology Commission[23010500800] ; State Key Laboratory of Compressor Technology (ANHUI Laboratory of Compressor Technology)
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001396328300001
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/180876
专题	中国科学院金属研究所
通讯作者	Zhao, Mingjiu; Rong, Lijian
作者单位	1.Shanghai Dianji Univ, Sch Mech Engn, 300 Shuihua Rd, Shanghai 201306, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Key Lab Nucl Mat & Safety Assessment, 72 Wenhua Rd, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Hu, Honglei,Zhao, Mingjiu,Song, Yuanyuan,et al. Serrated grain boundary formation and its effect on the hydrogen embrittlement of Fe-Ni based alloy[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2025,921:11.
APA	Hu, Honglei,Zhao, Mingjiu,Song, Yuanyuan,&Rong, Lijian.(2025).Serrated grain boundary formation and its effect on the hydrogen embrittlement of Fe-Ni based alloy.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,921,11.
MLA	Hu, Honglei,et al."Serrated grain boundary formation and its effect on the hydrogen embrittlement of Fe-Ni based alloy".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 921(2025):11.