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Effects of non-equilibrium microstructures on microstructure evolution and mechanical properties of laser powder bed fusion IN625 Ni-based superalloy during long-term thermal exposure at 700?C and 750?C

文献类型：期刊论文

作者Song, Zhenfeng1,2; Gao, Shuang1,2; Wang, Zhiqiang1,2; Lan, Liang1,2; Hou, Jieshan3; He, Bo1,2
刊名MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
出版日期2022-10-20
卷号856页码:10
ISSN号0921-5093
关键词Ni-Based superalloy Laser powder bed fusion Thermal exposure Microstructure evolution Mechanical property
DOI10.1016/j.msea.2022.143883
通讯作者Gao, Shuang(gaoshuang_alloy@163.com) ; He, Bo(jdhebo@163.com)
英文摘要The effect of non-equilibrium microstructures on microstructure evolution and mechanical properties of laser powder bed fusion (LPBF) IN625 alloy during long-term thermal exposure at 700 degrees C and 750 degrees C was studied in this study. The as-built (AB) LPBF IN625 alloy had a typical non-equilibrium microstructure consisting of fine dendritic and cellular microstructures, Laves phase and high-density tangled dislocations. The non-equilibrium microstructure transformed into uniform recrystallized microstructure after solution treatment (ST). During long-term thermal exposure, delta phase in AB sample preferentially nucleated in inter-dendritic regions with high -density dislocations, while delta phase in ST specimen firstly nucleated at grain boundaries (GBs) and then grew into grains. The coarsening rate of delta phase in AB sample was lower and the size of delta phase was smaller than those in ST sample. The coarsening of Laves phase at GBs led to the depleted-delta zone in AB sample, which was not found in ST sample. For AB and ST samples, the ultimate tensile strength (UTS) and yield strength (YS) increased with the increase of thermal exposure time, while the elongation (EI) decreased. The tensile strength of AB sample was higher than that of ST sample during the thermal exposure at 700 degrees C, while their tensile strength was close during the thermal exposure at 750 degrees C. In addition, the anisotropy of mechanical properties of AB LPBF IN625 alloy was eliminated gradually during long-term thermal exposure. The microstructure evolution of LPBF IN625 alloy during long-term thermal exposure was explained by a newly proposed mold.
资助项目Shanghai Sailing Program[19YF1417500]
WOS研究方向Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
出版者ELSEVIER SCIENCE SA
WOS记录号WOS:000862168800003
资助机构Shanghai Sailing Program
源URL[http://ir.imr.ac.cn/handle/321006/175784]  
专题金属研究所_中国科学院金属研究所
通讯作者Gao, Shuang; He, Bo
作者单位1.Shanghai Univ Engn Sci, Sch Mat Engn, Shanghai 201620, Peoples R China
2.Shanghai Univ Engn Sci, Res Ctr High Temp Alloy Precis Forming, Shanghai 201620, Peoples R China
3.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式
GB/T 7714		 Song, Zhenfeng,Gao, Shuang,Wang, Zhiqiang,et al. Effects of non-equilibrium microstructures on microstructure evolution and mechanical properties of laser powder bed fusion IN625 Ni-based superalloy during long-term thermal exposure at 700?C and 750?C[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2022,856:10.
APA Song, Zhenfeng,Gao, Shuang,Wang, Zhiqiang,Lan, Liang,Hou, Jieshan,&He, Bo.(2022).Effects of non-equilibrium microstructures on microstructure evolution and mechanical properties of laser powder bed fusion IN625 Ni-based superalloy during long-term thermal exposure at 700?C and 750?C.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,856,10.
MLA Song, Zhenfeng,et al."Effects of non-equilibrium microstructures on microstructure evolution and mechanical properties of laser powder bed fusion IN625 Ni-based superalloy during long-term thermal exposure at 700?C and 750?C".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 856(2022):10.

入库方式： OAI收割

来源：金属研究所

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