Main Catalog Metallurgy and Science of Materials Metal Science, Thermal Processing of Metals and Alloys

Laser surfacing of the Fe-Si system electrical steel

Authors: Yang Jun
Published in issue: #9(86)/2023
DOI: 10.18698/2541-8009-2023-9-932
Category: Metallurgy and Science of Materials \| Chapter: Metal Science, Thermal Processing of Metals and Alloys
Keywords: laser surfacing, electrical steel, kinetics, Fe – 6.5 % Si alloy, microstructure, microhardness, solid-solution strengthening
Published: 01.10.2023

The paper presents the purpose of electrical steel containing 6.5 % of silicon. It demonstrates possibility of producing electrical steel with high silicon content using the laser surfacing. Initial powder of the Fe – 6.5 % Si alloy was studied. The powder chemical analysis results and the samples’ geometric characteristics are described. To obtain three samples with different thicknesses using laser surfacing, the INSSTEK MX-GRANDE metal laser surfacing system was used. The Fe – 6.5 % Si alloy sample metallographic structure and properties were analyzed using the Olympus GX51 metallographic microscope and a Pruftechnik KB50 SR microhardness tester. It is shown that the alloy structure appears to be a single-phase ferrite. Cracks appeared in the middle and thick layer samples, their appearance was associated with high thermal stresses arising during laser recrystallization of the material. The alloy hardness was HV0.05 410–430. The alloy hardness high value was associated with the ferrite solid-solution strengthening by silicon (6.5 % Si) and with high concentration of defects in the crystal structure formed during laser recrystallization of the powder material.

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