Revealing the powder size-sintering temperature synergistic effect in microstructure transformation of 97 W alloy from extrusion-based additive manufacturing process

• Published in: Journal of alloys and compounds Vol. 1010; p. 178122
• Main Authors: Zhu, Dehui, Wu, Zhenqing, Tang, Hao, Yang, Jialin, Zhao, Zhuang, Wang, Chao, Xia, Zhihui, Ma, Chenglong, Wu, Meiping
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05.01.2025
• Subjects: Extrusion-based additive manufacturing; Mechanical properties; Microstructure transformation; Sintering densification; Tungsten heavy alloys; Mechanical properties; Sintering densification; Extrusion-based additive manufacturing; Microstructure transformation; Tungsten heavy alloys
• ISSN: 0925-8388
• DOI: 10.1016/j.jallcom.2024.178122

Aiming at the poor performance of tungsten heavy alloys produced by extrusion-based additive manufacturing process, the synergistic mechanism of powder size-sintering temperature in microstructure transformation of 97W-2.1Ni-0.9Fe alloy was investigated to improve the tensile properties. This study analyzed the powder morphology and thermal characteristics, as well as the phase and microstructure of 97W-2.1Ni-0.9Fe alloys. The results demonstrated that both powder size and sintering temperature exerted an influence on the grain size of W and the solid solubility of W in γ-phase. Consequently, the optimal sintering temperature for powders varied depending on their sizes. The 97W-2.1Ni-0.9Fe alloy, fabricated from mixed powders with a W particle size of 1.0 µm and sintered at 1470℃ for 0.5 h, exhibited superior tensile strength (903 ± 22 MPa) and elongation (11.9 ± 2.1 %) compared to conventional powder metallurgy product. These findings provide significant guidance for the extrusion-based additive manufacturing of high-performance tungsten heavy alloys. [Display omitted] •The tensile property of EAM 97W-2.1Ni-0.9Fe was superior to powder metallurgy samples.•Revealing the powder size-sintering temperature synergistic mechanism in microstructure transformation of 97W-2.1Ni-0.9Fe.•Liquid formation temperature of 97W-2.1Ni-0.9Fe powder was varied from powder size.•Sintering temperature changed the γ phase composition in 97W-2.1Ni-0.9Fe alloy.