Effect of nitrogen alloying and the electroslag refining process on the properties of AISI M41 steel |
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Authors: | Taha Mattar Kamal El Fawakhry Hossam Halfa Mahmoud El Demerdash |
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Affiliation: | (1) the Steel Technology Department (STD), Central Metallurgical Research and Development Institute (CMRDI), Cairo, Egypt;(2) Metallurgical Engineering Department, Faculty of Engineering, Cairo University, Giza, Egypt |
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Abstract: | Nitrogen produces very beneficial effects in high-speed steel and can therefore be regarded as a significant alloying element
in ferrous materials. In order to attain the goal of this study, to investigate the effect of nitrogen alloying and the electroslag
refining (ESR) process on the properties of AISI M41 steel, two high-speed steels were melted in an air induction furnace
(IF). The first one is a standard AISI M41 high-speed steel. The second one is nitrogen-alloyed M41. The produced ingots were
used as consumable electrodes in ESR under three different CaF2-based fluxes. The steel produced from the IF and ESR was heat treated. Hardness, secondary hardness, and microstructure were
also studied. It was concluded that both ESR and nitrogen alloying improve the hardness profile of the quenched-tempered high-speed
steels. The highest secondary hardness and highest softening resistance were attained by ESR of high-nitrogen high-speed steel
(M41N) under CaF2/CaO/Al2O3: 55/30/15 slag. The ESR improves the shape, size, and distribution of precipitates in the produced ingot. Quenching and tempering
treatment conditions the retained austenite that is present in the as-cast steel by precipitation of carbide and forming martensite
on cooling to room temperature. |
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