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杨广宇,陈靖海,刘楠,杨坤,贾亮,贾文鹏,王建,汤慧萍.基于预合金粉末原料的粉床型电子束增材制造W-Ni-Fe-Co合金研究[J].稀有金属材料与工程(英文),2020,49(11):3865~3869.[Yang Guangyu,Chen Jinghai,Liu Nan,Yang Kun,Jia Liang,Jian Wenpeng,Wang Jian and Tang Huiping.Research on W-Ni-Fe-Co alloys fabricated by Selective electron beam melting from pre-alloyed powder[J].Rare Metal Materials and Engineering,2020,49(11):3865~3869.]
Research on W-Ni-Fe-Co alloys fabricated by Selective electron beam melting from pre-alloyed powder
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Received:April 10, 2020  Revised:April 16, 2020
DOI:
Key words: Additive maunfacturing  Selective electron beam melting (SEBM)  tungsten alloy  W-Ni-Fe-Co alloys
Foundation item:科学挑战专题资助(项目号:TZ2018006),国家重点研发计划项目(2016YFB0700301)
Author NameAffiliation
Yang Guangyu,Chen Jinghai,Liu Nan,Yang Kun,Jia Liang,Jian Wenpeng,Wang Jian and Tang Huiping  
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Abstract:
      W-Ni-Fe-Co pre-alloyed powder was prepared by plasma rotating electrode process, and then fabricated by selective electron beam melting (SEBM). W-Ni-Fe-Co pre-alloy powder consists of spherical powders and irregular powders with the microstructure of tungsten particles coated by γ- (Ni-Fe) phase, which contains supersaturated tungsten. Microstructure of the W-Ni-Fe-Co alloy shows a certain heredity from powder to SEBMed sample. The molten pool will be subjected to recoil pressure, hot capillary force and Marangoni convection during SEBM, the instantaneous flow of the molten pool promoted the rearrangement of tungsten particles, leading a higher uniformity in the SEBM sample than the powder. Densification process during SEBM is mainly the rearrangement of W particles, and there is no significant dissolution-precipitation process of W. The tensile strength of SEBMed W-Ni-Fe-Co alloy was measured to be 1098MPa together with a poor ductility. Fracture mode is brittle transgranular fracture and ductile tearing of γ- (Ni-Fe) bonding phase.