Microstructural evolution and fatigue cracking mechanisms of as-built and solution-aged Inconel 718 superalloy fabricated by selective laser melting at service temperature
文献类型：期刊论文
| 作者 | Sun, Chuanwen2; Li, Wei2; Li, Cheng1; Cao, Xiaobo2; Sun, Rui3; Jin, Yuzhe2; Hu, Zifan2 |
| 刊名 | ENGINEERING FAILURE ANALYSIS
 |
| 出版日期 | 2025-11-01 |
| 卷号 | 181页码:18 |
| 关键词 | Selective laser melting Nickel-based superalloy Long life fatigue Heat treatment effect Temperature assisted cracking mechanism |
| ISSN号 | 1350-6307 |
| DOI | 10.1016/j.engfailanal.2025.109996 |
| 通讯作者 | Li, Wei(lliw@bit.edu.cn) ; Sun, Rui(rsun@c-nin.com) |
| 英文摘要 | Fatigue is one of the critical failure modes that restricts the safety and reliability of additively manufactured materials. However, the failure mechanisms associated with heat treatment, microstructure, service environment and long-term action are not yet well understood. To address this, long life fatigue tests and multiscale analyses are conducted to investigate the microstructural evolution and fatigue cracking mechanisms of as-built and solution-aged Inconel 718 superalloy fabricated by selective laser melting (SLM) at service temperature of 650 degrees C. The results show that solution aging eliminates the lamellar structure and melt pool prevalent in SLM alloy, transforming the microstructure from cellular dendrites to a needle-like morphology. The improvement in fatigue properties is mainly attributed to gamma matrix strengthening by Laves phase dissolution and precipitation of gamma' and gamma" phases. When the fatigue life exceeds 106 cycles, subsurface and interior failures dominate in both states at 650 degrees C. Microcracks usually nucleate at SLM defects and grow transgranularly, fracturing grains of varying orientations and forming highly uneven facets. Such defect-assisted faceted cracking characterizes interior failure. In asbuilt specimens, the absence of effective precipitate pinning promotes the formation of slip band stacks, dislocation networks, and dislocation entanglements. In contrast, dislocation evolution in solution-aged specimens results from the interplay of anti-phase boundary shearing, precipitate bypassing, and stacking fault shearing. |
| 资助项目 | National Natural Science Foundation of China[52175128] ; State Key Laboratory for Mechanical Behaviour of Materials[20232501] |
| WOS研究方向 | Engineering ; Materials Science |
| 语种 | 英语 |
| WOS记录号 | WOS:001582047800001 |
| 资助机构 | National Natural Science Foundation of China ; State Key Laboratory for Mechanical Behaviour of Materials |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/104110]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 通讯作者 | Li, Wei; Sun, Rui |
| 作者单位 | 1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China 2.Beijing Inst Technol, Sch Mech Engn, Beijing 100081, Peoples R China 3.Northwest Inst Nonferrous Met Res, Refractory Mat Res Cent, Xian 710016, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sun, Chuanwen,Li, Wei,Li, Cheng,et al. Microstructural evolution and fatigue cracking mechanisms of as-built and solution-aged Inconel 718 superalloy fabricated by selective laser melting at service temperature[J]. ENGINEERING FAILURE ANALYSIS,2025,181:18. |
| APA | Sun, Chuanwen.,Li, Wei.,Li, Cheng.,Cao, Xiaobo.,Sun, Rui.,...&Hu, Zifan.(2025).Microstructural evolution and fatigue cracking mechanisms of as-built and solution-aged Inconel 718 superalloy fabricated by selective laser melting at service temperature.ENGINEERING FAILURE ANALYSIS,181,18. |
| MLA | Sun, Chuanwen,et al."Microstructural evolution and fatigue cracking mechanisms of as-built and solution-aged Inconel 718 superalloy fabricated by selective laser melting at service temperature".ENGINEERING FAILURE ANALYSIS 181(2025):18. |
入库方式： OAI收割
来源：力学研究所
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