Title
Influence of SPD processes parameters on the corrosion resistance of selected low-carbon structural steels and aluminium alloys
Code
52610282
Start year
2026
End year
2027
Provider
Visegrad Fund
Category
Projekt
Type
Visegrádské granty
Summary
The constantly growing demand in automotive, aviation, and many other industries for materials with high strength properties and at the same time good plasticity forces the need to carry out innovative manufacturing techniques, including SPD methods and diverse research aimed at obtaining controlled structural changes of these materials.
Metal forming using SPD methods has become increasingly common in recent years. This interest stems from the ability to achieve high grain refinement down to the micrometre and sometimes nanometre range, and above all, from the tangible benefits derived from creating such structures.
The research will be carried out using the CBSM-RS methods. In the CBSM-RS method will be carried out on a dedicated test stand by generating deformations as a result of cyclical bending of strips and sheets when moving through multi-roll system, without changing their thickness, while maintaining an elongation ratio of 1. A set of rolls of different quantity and diameter depending on the thickness of the band, with the possibility of changing their position, both in the direction perpendicular and parallel to the axis of the deformed material, will provide the possibility of controlled deformation, and thus control the structure and properties of the material. Additional research will be implemented using the ECAP, TCAP and DRECE methods under various deformation and heat treatment conditions. The tests will utilise aluminium alloys, including 2099, 5083, 6061 and 7075 (CBSM-RS, ECAP, TCAP), and low-carbon structural steels, including DC01 and DC03 (CBSM-RS and DRECE).
The deformed materials will then be subjected to comprehensive corrosion resistance testing, using a set of electrochemical and environmental methods, enabling a quantitative assessment of the material's susceptibility to uniform, localised (pitting and crevice), intergranular, and exfoliative corrosion, as well as stress-corrosion cracking and fatigue degradation in corrosive environments.
After completion of the electrochemical and environmental tests, the samples will undergo a detailed post-mortem analysis. Scanning electron microscopy (SEM) with EDS composition analysis will be used to assess damage morphology and identify corrosion products, optical microscopy and metallographic analysis of cross-sections will be used to determine pit depth and the extent of intergranular corrosion, and X-ray diffraction (XRD) and infrared spectroscopy will be used to identify secondary phases and degradation products. The weight loss of the sample will be determined using precision analytical balances, while surface profilometry and microhardness measurements in the corrosion zones will provide additional quantitative data.
Obtaining comprehensive results of corrosion resistance tests of low-carbon structural steels and aluminium alloys deformed in the CBSM-RS, DRECE, ECAP, and TCAP processes will allow for determining the scope of their applicability in industrial conditions under various environmental conditions.