Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
MEASUREMENT METHODOLOGIES FOR INVESTIGATING THE THERMAL BEHAVIOR OF A FERROUS MATRIX COMPOSITE REINFORCED BY CARBIDE OR NIOBIUM NITRIDE
Submission Author:
Júlia Comunello , SC , Brazil
Co-Authors:
Júlia Comunello, Isadora Schramm Deschamps, Isadora Hasselmann Machado, Aloisio Nelmo Klein
Presenter: Isadora Hasselmann Machado
doi://10.26678/ABCM.COBEM2023.COB2023-2238
Abstract
This study investigates the coarsening behavior of niobium carbide (NbC) and nitride (NbN) reinforcements in an iron matrix composite. The production process is based on research carried out at the Materials Laboratory (Labmat) at UFSC and aimed at developing a cost-effective composite material that displays promising mechanical properties, owing to its submicrometric reinforcements. Thanks to the low solubility of niobium carbides in iron, such fine microstructure is expected to be retained even at higher temperatures. The aim of this study is to evaluate the coarsening sensitivity of such composite regarding different thermal cycles, in order to understand the extent to which operations, such as forging, hot pressing, cladding, welding, and cutting, could be made without compromising the composite’s microstructure. Three heat treatment conditions were defined based on thermodynamic simulations using the Thermo-Calc® software: 1150°C for 10 hours 1500°C, for 1 hour; and 1150°C for 5 hours. Reinforcement analysis of the ferrous matrix was performed using image analysis and acid digestion followed by ZetaSizer® analysis. Coarsening was also simulated using PRISMA®. Mean reinforcement did not exceed 4 μm in any of the composites nor experimental measurements, which is lower than the 10 μm predicted by the simulations in the highest temperature condition. Moreover, the characterization methods and their overall reliability were thoroughly discussed considering the particularities of each technique.
Keywords
MMC, Coalescence, in situ, Carbide, Nitride, niobium, powder metallurgy, Image and Experimental Analysis, Acid dissolution, thermodynamic properties.
