Details

Autor(en) / Beteiligte

• He, J.
• Zhang, B.G.
• Li, W.L.

Titel

The dependence of the electron beam remelting parameters on the surface residual stress and hardness of NbSi2 coatings on niobium alloys

Ist Teil von

• Journal of alloys and compounds, 2013-11, Vol.577, p.436-438

Ort / Verlag

Kidlington: Elsevier B.V

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •The NbSi2 coatings were treated by electron beam remelting process.•After EB treatment, the amount of porosity and cracks of the coatings were reduced, and the grain was finer.•With the EB voltage increasing, the residual stress state of the coatings is first tensile and then turns to be compressive.•The increase for hardness of the coatings mainly comes from the presence of residual stress and Nb5Si3 phase. NbSi2 coatings were prepared on niobium alloy surface by a fused slurry method. Electron beam remelting process is explored to modify the morphology and the phase composition of the coated layer. After electron beam treatment, the amount of porosity and cracks of the coatings are reduced, and the grain is finer. With accelerating voltage of the electron beam increasing, Nb5Si3 phase can be detected in the NbSi2 coatings. The results of residual stress and surface hardness provide a good evidence to explain the microstructure evolution and surface modification of the coatings.