Role of preplaced silicon on a TIG processed SiC incorporated microalloyed steel

Baker, Thomas Neville and Muñoz-de Escalona, Patricia and Olasolo, Maider and Marrocco, Tiziana and Kelly, James and Wei, Bingquiang and He, Kejian and Mridha, Shahajahan (2020) Role of preplaced silicon on a TIG processed SiC incorporated microalloyed steel. Materials Science and Technology, 36 (12). pp. 1349-1363. ISSN 0267-0836 (https://doi.org/10.1080/02670836.2020.1781355)

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Abstract

Research aimed at enhancing the surface properties of carbon steels by incorporating fine silicon carbide particulates has had limited success because the dissolution of the ceramic occurred. This research considers a method of reducing SiC dissolution by generating a high Fe–Si liquid which protects the ceramic. Three particulate groups were investigated, (1) ∼ 5 µm SiC, (2) ∼45 µm Si +∼ 5 µm SiC, and (3) ∼45 µm Si, all incorporated into a microalloyed steel using a tungsten inert gas process. Detailed microhardness of the melt zones together with microstructural analysis showed that the addition of Si resulted in a cracked hard layer containing SiC. However, in Specimen 1, a thicker, hardcrack-free layer resulted from the microstructure developed by the dissolution of SiC.

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