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- 2023The role of physical properties in explosive welding of copper to stainless steelcitations
- 2022Cast Austenitic Stainless Steel Reinforced with WC Fabricated by Ex Situ Techniquecitations
- 2021Characterization of Iron-Matrix Composites Reinforced by In Situ TiC and Ex Situ WC Fabricated by Castingcitations
- 2021Effect of Heat Treatment on the As-Cast Microstructure and Hardness of NiSi3B2 Alloy
- 2021Production of TiC-MMCs Reinforcements in Cast Ferrous Alloys Using In Situ Methodscitations
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article
Effect of Heat Treatment on the As-Cast Microstructure and Hardness of NiSi3B2 Alloy
Abstract
Cast Ni-Si-B alloys have the potential for high-temperature applications because of their high resistance to wear, impact, corrosion, and oxidation at elevated temperatures due to an appropriate balance of hard phases and austenite that ensures a good compromise between toughness and hardness. In this work, NiSi3B2 specimens, fabricated by the lost-wax casting process, were investigated. Given the complex multiphase cast microstructure, a differential scanning calorimeter (DSC-TGA) analysis was employed to characterize the reactions that occur during solidification and the resulting phases were characterized using scanning electron microscopy (SEM), with energy-dispersive microanalysis (EDS) and backscattered electron (BSE) image and X-ray diffraction (XRD). Due to the presence of hard phases, machining of the Ni-Si-B components can pose additional difficulties. Therefore, the conditions of the solution heat treatment, which might lead to the homogenization of the microstructure, consequently improving its machinability, were also investigated. The results of the heat-treated samples indicated that the dissolution of the eutectic constituent is accompanied by a significant decrease in the hardness (approximately 17%). It is important to emphasize that the solution heat treatments carried out reduced the hardness without affecting the percentage of borides, which will allow improving the machinability without adversely affecting the alloy performance in service.