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Microstructural evolution and formation of fine grains during fatigue crack initiation process of laser powder bed fusion Ni-based superalloy

文献类型：期刊论文

作者Shi, Tao3,4; Li, Jianghua3,4; Gao, Guhui2; Sun, Jingyu3,4; Yang, Zhigang1; Yan, Jiayi1; Qian, Guian3,4; Qian GA(钱桂安)
刊名ADDITIVE MANUFACTURING
出版日期2024-04-05
卷号85页码:17
关键词Microstructure Competitive fatigue failure mechanism Laser powder bed fusion (LPBF) Grain refinement Precipitate dissolution
ISSN号2214-8604
DOI10.1016/j.addma.2024.104151
通讯作者Qian, Guian(qianguian@imech.ac.cn)
英文摘要This study reports the fatigue failure mechanism at very -high -cycle fatigue (VHCF) regime of laser powder bed fusion (LPBF) GH4169 superalloy through a series of detailed microstructural characterizations, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron backscatter diffraction (EBSD), and energy dispersive spectrometer (EDS). Microstructural characterization of the solution and doubleaging post -treated initial material exhibits process -induced imperfections (mainly pores), as well as gamma ' , gamma '' and delta precipitates, and carbide. The fatigue tests were performed using an ultrasonic fatigue tester (20 kHz). Fatigue fracture analysis suggests there exists a competitive fatigue failure mechanism with surface flaw initiation and internal pore initiation, corresponding to high -cycle fatigue (HCF) and VHCF regime, respectively. Focused ion beam (FIB) samples taken within the fatigue initiation area (FIA) revealed grain refinement and precipitate dissolution behavior. Based on the characterization results, the fatigue crack initiation mechanism was hypothesized: During numerous cyclic loading, the mobile dislocations shear gamma ' and gamma '' precipitates, causing their dissolution and local chemical and mechanical alterations near internal pores. This enables twinning and promotes sub -grains formation. Sub -grains refine via localized continuous dynamic recrystallization (CDRX), forming a fine-grained layer that leads to crack initiation. This work reveals how precipitate dissolution contributes to VHCF crack initiation in LPBF GH4169 superalloy, highlighting the potential for extending alloy lifespan by adjusting precipitates and LPBF defects and incorporating these factors into fatigue life predictions for enhanced accuracy.
WOS关键词HIGH-CYCLE FATIGUE ; INCONEL 718 ; MECHANICAL-PROPERTIES ; FAILURE ; TEMPERATURE ; INCLUSIONS
资助项目National Natural Science Foundation of China[12072345] ; National Natural Science Foundation of China[11932020] ; National Natural Science Foundation of China[12202444] ; National Natural Science Foundation of China[12272377] ; International Partnership Program for Grand Challenges of Chinese Academy of Sciences[025GJHZ2023092GC] ; Science Center for Gas Turbine Project[P2022 -B -III -008-001]
WOS研究方向Engineering ; Materials Science
语种英语
WOS记录号WOS:001236880900001
资助机构National Natural Science Foundation of China ; International Partnership Program for Grand Challenges of Chinese Academy of Sciences ; Science Center for Gas Turbine Project
源URL[http://dspace.imech.ac.cn/handle/311007/95486]  
专题力学研究所_非线性力学国家重点实验室
通讯作者Qian, Guian
作者单位1.Tsinghua Univ, Sch Mat Sci & Engn, Key Lab Adv Mat, Minist Educ, Beijing 100084, Peoples R China
2.Beijing Jiaotong Univ, Sch Mech Elect & Control Engn, Beijing 100044, Peoples R China
3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China
推荐引用方式
GB/T 7714		 Shi, Tao,Li, Jianghua,Gao, Guhui,et al. Microstructural evolution and formation of fine grains during fatigue crack initiation process of laser powder bed fusion Ni-based superalloy[J]. ADDITIVE MANUFACTURING,2024,85:17.
APA Shi, Tao.,Li, Jianghua.,Gao, Guhui.,Sun, Jingyu.,Yang, Zhigang.,...&钱桂安.(2024).Microstructural evolution and formation of fine grains during fatigue crack initiation process of laser powder bed fusion Ni-based superalloy.ADDITIVE MANUFACTURING,85,17.
MLA Shi, Tao,et al."Microstructural evolution and formation of fine grains during fatigue crack initiation process of laser powder bed fusion Ni-based superalloy".ADDITIVE MANUFACTURING 85(2024):17.

入库方式： OAI收割

来源：力学研究所

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