Communications - Scientific Letters of the University of Zilina 2018, 20(3):19-23 | DOI: 10.26552/com.C.2018.3.19-23

Resistance of High-Strength Steels to Stress Corrosion Cracking Depending on External Environment pH Factor

Petr Jonsta1, Irena Vlckova2, Zdenek Jonsta1, Vladimir Tomasek1, Tatana Fenclova1
1 Faculty of Metallurgy and Materials Engineering, VSB-TU Ostrava, Czech Republic
2 RMTSC, Material & Metallurgical Research Ltd., Remote Site Ostrava, VUHZ a.s., Dobra, Czech Republic

The paper deals with the study of stress corrosion cracking of high-strength steels in an aqueous environment with a varying pH factor ranging from 5.5 to 12.0. Steels were studied after quenching and tempering, one of the steels was prone to temper embrittlement.

Single-edge notched pre-cracked specimens were used for the experiments. Changes in the pH factor at the crack tip were measured using an antimony electrode. The pH factor values at the crack tip dropped to 2.0. Steel prone to temper embrittlement showed significantly shorter incubation period and more accelerated development of corrosion process compared to the optimized heat treatment of the second steel. Proneness to intergranular fracture was observed close to the fatigue crack tip. The obtained results expand the existing knowledge about localized corrosion processes leading to the refinement of the stress corrosion cracking model when changing the pH factor on the crack tip.

Keywords: high-strength steels; heat treatment; stress corrosion cracking; pH factor; intergranular fracture

Received: January 8, 2018; Accepted: March 15, 2018; Published: September 30, 2018  Show citation

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Jonsta, P., Vlckova, I., Jonsta, Z., Tomasek, V., & Fenclova, T. (2018). Resistance of High-Strength Steels to Stress Corrosion Cracking Depending on External Environment pH Factor. Communications - Scientific Letters of the University of Zilina, 20(3), 19-23. doi: 10.26552/com.C.2018.3.19-23
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