In situ synthesis of spherical WMo alloy powder for additive manufacturing by spray granulation combined with thermal plasma spheroidization. (February 2021)

• Record Type: Journal Article
• Authors: Tan, Zhen; Zhou, Zhenlu; Wu, Xu; Wang, Yiming; Shao, Wei; Guo, Xingye; Zhou, Zheng; Yang, Ying; Wang, Guohong; He, Dingyong
• Is Part Of: International journal of refractory metals & hard materials. Volume 95(2021)
• Publication Date: 2021-02
• Subjects: WMo alloy powder -- Spray granulation -- Thermal plasma spheroidization -- Microstructure evolution -- Solid solution alloying; Heat resistant alloys -- Periodicals; Refractory materials -- Periodicals; Metallography -- Periodicals; Alliages réfractaires -- Périodiques; Matériaux réfractaires -- Périodiques; Métallographie -- Périodiques; Heat resistant alloys; Metallography; Refractory materials; Periodicals; Electronic journals; 669.73
• DOI: 10.1016/j.ijrmhm.2020.105460
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: In the present research, spherical WMo alloy powder for additive manufacturing was successfully synthesized by spray granulation (SG) in combination with thermal plasma spheroidization (TPS). Firstly, W and Mo particles (1–3 μm) were banded together through SG and formed porous agglomerated powder with desired particle size distribution and flowability. The porous agglomerated WMo powder was subsequently melted through thermal plasma, W and Mo dissolved together and formed solid solution accompanied with powder densification during TPS. Through optimization of the process conditions, the spheroidized WMo alloy powder exhibits homogeneous element distribution, low oxygen content (~0.08%), and good flowability (10 s/50 g), which meet the demand for laser powder bed fusion (LPBF). Remarkably, nearly full dense WMo alloy with few pores could be fabricated by LPBF based on the spheroidized WMo alloy powder. Graphical abstract: Unlabelled Image Highlights: Spherical WMo alloy powder for AM was synthesized combined SG with TPS. W and Mo formed solid solution accompanied with powder densification during TPS. Nearly full density WMo alloy could be fabricated by LPBF based on WMo alloy powder.