Dr. Guohong Wang Profile

Dr. Guohong Wang

at Beijing Univ of Technology

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Publications (2)

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Proceedings Article | 9 October 2021 Presentation

Preparation and properties of B-modified MoSi2 powders for laser cladding

Ming Jin, Dingyong He, Wei Shao, Zhen Tan, Xingye Guo, Zheng Zhou, Guohong Wang, Xu Wu, Li Cui, Lian Zhou

Proceedings Volume 11892, 118920C (2021) https://doi.org/10.1117/12.2601221

KEYWORDS: Cladding, Oxygen, Oxidation, Particles

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Due to the formation of protective borosilicate scale during high-temperature oxidation, Mo-62Si-5B (at.%) alloy is deemed to be the promising candidate of high-temperature oxidation resistant coatings. Nevertheless, it faces the challenges on the application on surface engineering due to the difficulty of powder fabrication. In the present study, the pre-alloyed powder was obtained by mechanical crushing from Mo-62Si-5B bulk alloy fabricated by vacuum induction levitation melting. Subsequently, the original powder was further sieved by 60 mech sifter for the compatibility of laser cladding. The size distribution, morphology, oxygen content and phase composition of the powder were characterized. The results show that the D(50) of the powder is 130.55 μm and the average particle size is 124.65 μm. There are MoSi2 and MoB2 phases distributed in the powder with irregular morphologies, which is accord with the bulk Mo-62Si-5B alloy. The oxygen content of the powder is lower than 0.11%, meeting the requirements of the powder for laser cladding. A laser cladded layer was prepared on Nb-Si based alloy substrate by using the powders, which exhibits dense structure free of voids and cracks. The study proves the feasibility of pre-alloyed Mo-62Si-5B powder, which may give guidance for producing Mo-Si-B system oxidation-resistant coating by laser cladding or thermal spraying.

Proceedings Article | 9 October 2021 Presentation

Effect of geometrical morphologies, support structure and adding second phase on the microstructure of tungsten fabricated by selective laser melting

Zhenlu Zhou, Dingyong He, Zhen Tan, Yiming Wang, Zheng Zhou, Xingye Guo, Wei Shao, Cui Cui, Guohong Wang, Ying Yang

Proceedings Volume 11892, 118920E (2021) https://doi.org/10.1117/12.2601217

KEYWORDS: Tungsten, Spatial light modulators, Copper

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In order to further explore the application of W and W alloy fabricated by selective laser melting (SLM), W with different geometrical morphologies, support structure and second phase combination were prepared, and the corresponding microstructure characteristics were also investigated. The grain morphology and size distribution were significantly depend on the heat dissipation conditions caused by different geometrical morphologies, support structure and second phase combination. With the specimen size increases from 1D-2 to 3D, the average grain size increases, the percentage of large grains increases, and the dislocation density decreases. Because no remelting occurred in 2D specimen due to no overlap in the corresponding position, more prone to epitaxial growth and formed elongated cellular grains. Increase the height of support structure could decrease the cooling rate, especially the center area, which induced the grain size along with the reduction of cracks. The crack in pure W during SLM was related to the high thermal stress caused by high cooling rate as well as the recrystallization and epitaxial growth of W phase during SLM. Adding the second phase such as Cu or Cu10Sn could reduce the grain size of W phase remarkably, and crack was severely restrained in W phase simultaneously. This could be attributed to that grain refinement of W phase could decrease the DBTT and the second phase combination also breaks the epitaxial growth of W phase.

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