The influence of the obtaining procedure and thermomechanical treatment on the grain size of copper micro-alloyed with iron and phosphorus
Loading...
Date
2023
Authors
Mitrović, Milijana
Marjanović, Saša
Trumić, Biserka
Petrović, Jasmina
Nedeljković, Milan
Journal Title
Journal ISSN
Volume Title
Publisher
Fakultet Tehničkih nauka, Kosovska Mitrovica
Source
Zbornik izvoda radova - Jedanaesti simpozijum o termodinamici i faznim dijagramima sa međunarodnim učešćem, Kosovska Mitrovica, 23-24. jun 2023, 2023, 33-36
Volume
Issue
Abstract
The aim of this work was to analyze the influence of the obtaining procedure and thermomechanical treatment on the grain size of copper micro-alloyed with iron and phosphorus (0,003 wt%Fe and 0,014 wt%P). Microalloyed copper was obtained in two ways: by melting of cathode copper and prealloy CuFe0.1 and CuP6.42 in an induction furnace, which was followed by the casting; and melting of the same raw materials and casting with the "up-cast" process, which was followed by extrusion. Pure (cathode) copper was also obtained by casting in order to compare with micro-alloyed copper. The samples obtained in this way were subjected to thermomechanical processing, which involved cold plastic deformation by rolling with 50%, which was followed by annealing at 470°C for 50 min. Microstructural analysis of the prepared samples was performed using optical microscopy, and the average grain size and grain size distribution were determined using ImageJ software. The results show that the pure copper sample has the coarsest structure with an average grain size of 30.58 μm, the microalloyed copper obtained by melting in an induction furnace has a slightly finer grain of 27.86 μm, while the finest is in the sample obtained by "up-cast" and extrusion process with 20.33 μm. The micro-addition of iron had influence on the grain refinement, because it acts as an inhibitor of grain growth during deformation and heat treatment, while the addition of phosphorus improved the flowability and plastic processing of the examined material. The extrusion process has shawn justification in terms of grain refinement, because the finer the grain before deformation, the finer the recrystallized grain will be. A smaller starting grain causes a higher accumulated energy and density of dislocations during deformation, so that conditions are created for the formation of nucleus in many more places inside the grain. The combination of extrusion and rolling not only reduced the grain size, but also reduced the heterogeneity of grain distribution in the tested sample.
Description
Keywords
Citation
DOI
Scopus
ISSN
ISBN
978-86-81656-63-1
License
ARR