CORROSION BEHAVIOUR OF TEMPERED 42CrMo4 STEEL

  • Sunčana Smokvina Hanza V. C. Emina 5
  • Lovro Štic University of Rijeka, Faculty of Engineering, Vukovarska 58, 51000 Rijeka, Croatia
  • Lovro Liverić University of Rijeka, Faculty of Engineering, Vukovarska 58, 51000 Rijeka, Croatia
  • Vedrana Špada METRIS Materials Research Centre of Region of Istria, Zagrebačka 30, 52100 Pula, Croatia
Keywords: Quenching, Tempering, Characterization, Corrosion

Abstract

Low-alloy 42CrMo4 steel (AISI 4140) is a medium carbon steel, commonly used as a quenched and tempered steel. Because of its good mechanical properties, high tensile strength and toughness, 42CrMo4 is one of the widely used and investigated steels. In order to increase ductility even more, in addition to standard quenching and tempering, steel is often hardened by double quenching and tempering and austempering. The aim of this paper was to investigate the corrosion behaviour of 42CrMo4 steel after quenching and tempering, double quenching and tempering and austempering. For this purpose, microstructural characterization and electrochemical investigation after different hardening processes were performed. Microstructure of specimens was observed using optical microscopy and scanning electron microscopy. Open circuit potential and potentiodynamic polarization measurements of tempered specimens were carried out using computer-controlled potentiostat with three electrode set-up in 0.6 M NaCl naturally aerated solution. It was concluded that applied heat treatment processes increase the corrosion resistance of 42CrMo4 steel in comparison to normalized steel. In comparison to quenched and tempered steel, double quenching and tempering, as well as austempering, do not significantly change corrosion resistance of steel.

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Published
2021-05-31
How to Cite
1.
Smokvina HanzaS, Štic L, Liverić L, Špada V. CORROSION BEHAVIOUR OF TEMPERED 42CrMo4 STEEL. MatTech [Internet]. 2021May31 [cited 2023Feb.5];55(3):427–433. Available from: https://mater-tehnol.si/index.php/MatTech/article/view/14