Abstract
Hot-formed components are constantly exposed to hostile environments with corrosive substances. Microstructural changes caused by thermomechanical processing can be predicted to increase the corrosion resistance of austenitic stainless steels. The objective of this study is to understand the relationship between the dynamic softening mechanisms and corrosion resistance, thus optimizing the hot-forming process. In the current work, the dynamic recrystallization (DRX) behavior of AISI 316 L austenitic stainless steel was studied in the temperature range of 1273 - 1423 K and strain-rate range of 0.1 - 5.0 s-1 using physical simulation. Subsequently, potentiodynamic polarization tests and scanning electron microscopy were performed on the hot-deformed samples to investigate the influence of temperature and strain-rate on the corrosion resistance and mechanical properties. The results indicated that the DRX fractions increased under low-temperature and high strain-rate conditions, resulting in grain refinement. The potentiodynamic polarization tests indicated that the dynamically recovered samples demonstrated high resistance to corrosion compared with the DRX samples. The best route found for the investigated alloy was for the strain to be applied at a temperature of 1423 K and a strain rate of 0.1 s-1.
Highlights
Various industries require increasingly versatile materials for very specific applications
The dynamic recrystallization (DRX) behavior of AISI 316 L austenitic stainless steel was studied in the temperature range of 1273 - 1423 K and strain-rate range of 0.1 5.0 s−1 using physical simulation
Potentiodynamic polarization tests and scanning electron microscopy were performed on the hot-deformed samples to investigate the influence of temperature and strain-rate on the corrosion resistance and mechanical properties
Summary
Various industries require increasingly versatile materials for very specific applications. Stainless steel possesses interesting characteristics such as weldability, mechanical properties, corrosion resistance, and wide working-temperature range [1] [2]. With these characteristics, these alloys have been in demand for applications in pipelines, heat exchangers, hospital equipment, cryogenic valves, and similar purposes. These alloys have been in demand for applications in pipelines, heat exchangers, hospital equipment, cryogenic valves, and similar purposes Before these components are manufactured, they are thermomechanically processed by hot rolling or forging to obtain the desired geometries [4]. Physical simulation of thermomechanical processing can predict the deformation parameters that can be used in the industry to obtain microstructures that demonstrate good mechanical properties and higher corrosion resistance
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