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

https://doi.org/10.26552/com.C.2018.3.19-23

  • Petr Jonsta
  • Irena Vlckova
  • Zdenek Jonsta
  • Vladimir Tomasek
  • Tatana Fenclova
Keywords: high-strength steels, heat treatment, stress corrosion cracking, pH factor, intergranular fracture

Abstract

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.

Author Biographies

Petr Jonsta

Faculty of Metallurgy and Materials Engineering, VSB-TU Ostrava, Czech Republic

Irena Vlckova

RMTSC, Material & Metallurgical Research Ltd., Remote Site Ostrava, VUHZ a.s., Dobra, Czech Republic

Zdenek Jonsta

Faculty of Metallurgy and Materials Engineering, VSB-TU Ostrava, Czech Republic

Vladimir Tomasek

Faculty of Metallurgy and Materials Engineering, VSB-TU Ostrava, Czech Republic

Tatana Fenclova

Faculty of Metallurgy and Materials Engineering, VSB-TU Ostrava, Czech Republic

Published
2018-09-30
How to Cite
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. https://doi.org/10.26552/com.C.2018.3.19-23
Section
Mechanical Engineering in Transport