Effects of ECAP and Different Aging Processes on the Corrosion Resistance of Maraging Stainless Steel

Yinan Chen

doi:10.6919/ICJE.202504_11(4).0021

Authors

Yinan Chen

DOI:

https://doi.org/10.6919/ICJE.202504_11(4).0021

Keywords:

1RK91 Maraging Stainless Steel; ECAP ; Aging Process; Corrosion Resistance; Electrochemical Test.

Abstract

This paper focuses on 1RK91 maraging stainless steel to explore the influence of different Equal Channel Angular Pressing (ECAP) passes and aging processes on its corrosion resistance in a 3.5% NaCl solution. Through electrochemical polarization curve testing and impedance spectroscopy analysis, the results indicate that after ECAP treatment, the corrosion resistance of the samples initially improves and subsequently deteriorates. Samples treated with ECAP-1 and ECAP-2 exhibit superior corrosion resistance, whereas those subjected to ECAP-3 demonstrate the poorest performance due to increased dislocation density and reduced volume fraction of retained austenite. Under conventional aging processes, both solution-treated and ECAP-3-treated samples show optimal corrosion resistance in the T₃ condition and the worst in T₄. Additionally, ECAP-3 samples after conventional aging exhibit better corrosion resistance than solution-treated counterparts under the same aging conditions. For step-aging processes, solution-treated samples achieve the best corrosion resistance in T₈ and the worst in T₅. Conversely, ECAP-3-treated samples display the highest corrosion resistance in T5 and the lowest in T₈. With the exception of the T₈ condition, ECAP-3 samples subjected to step-aging generally exhibit enhanced corrosion resistance compared to solution-treated samples undergoing step-aging. This study provides a reference for selecting optimal treatment processes for 1RK91 maraging stainless steel in industrial applications.

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