INVESTIGATION OF THE INFLUENCE OF THE INITIAL MICROSTRUCTURE UNDER DIFFERENT REGIMES OF HEAT TREATMENT ON THE MECHANICAL PROPERTIES OF 42CrMо4 STEEL

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  • TITLE: INVESTIGATION OF THE INFLUENCE OF THE INITIAL MICROSTRUCTURE UNDER DIFFERENT REGIMES OF HEAT TREATMENT ON THE MECHANICAL PROPERTIES OF 42CrMо4 STEEL
  • AUTHOR(S): V. Todorov
  • ABSTRACT: In this article, the impact of heat treatments - normalization and a combination of normalization, quenching and high-temperature tempering - on the microstructure and mechanical properties of 42CrMo4 steel specimens is investigated. Three groups of samples were studied: 1) asreceived; 2) after normalization at temperature of 860� � with holding time of 20 minutes and cooling in air; 3) after normalization (860��/20 minutes), quenching at 850�� in oil and then tempered at 590��, followed of cooling in air. The phase and microstructural analysis revealed the presence of retained austenite in the samples subjected to normalization. The resulting microstructure is ferrite-sorbite, containing about 10% retained austenite. The mechanical properties for the three investigated groups of samples showed the highest values for tensile strength (Rm=1147 MPa) and hardness (324 HBW) after normalization, and the highest elongation (12.9%) was obtained with the combination of normalization, quenching and high temperature tempering.
  • DOI: https://doi.org/10.62853/PHAV2471
  • PAGES: 49-53
  • DOWNLOAD: INVESTIGATION OF THE INFLUENCE OF THE INITIAL MICROSTRUCTURE UNDER DIFFERENT REGIMES OF HEAT TREATMENT ON THE MECHANICAL PROPERTIES OF 42CrMо4 STEEL
  • HOW TO CITE THIS ARTICLE: V. Todorov. Investigation of the influence of the initial microstructure under different regimes of heat treatment on the mechanical properties of 42CrMo4 steel. Journal of Technical university of Gabrovo. 68 (2024) 49-53.