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Article

Study of the Effect of Multiple Tempering on the Impact Toughness of Forged S690 Structural Steel

1
Department of Industrial Engineering, University of Padua, Via Marzolo 9, 35131 Padova, Italy
2
Nosov Magnitogorsk State Technical University, pr. Lenina, 38, 455000 Magnitogorsk, Russia
3
FOC Ciscato S.p.a., Via Pasin 1, 36010 Velo D’astico (VI), Italy
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Department of Management and Engineering, University of Padova, Stradella San Nicola 3, 36100 Vicenza, Italy
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Department of Civil, Environmental and Architectural Engineering, University of Padova, Via Marzolo 9, 35131 Padua, Italy
*
Author to whom correspondence should be addressed.
Metals 2020, 10(4), 507; https://doi.org/10.3390/met10040507
Received: 13 March 2020 / Revised: 6 April 2020 / Accepted: 10 April 2020 / Published: 14 April 2020
(This article belongs to the Special Issue Mechanical Properties and Microstructure of Forged Steel)
During the production of forged metal components, the sequence of heat treatments that are carried out, as well as hot working, remarkably influences mechanical properties of the product, in particular impact toughness. It is possible to tailor impact toughness by varying tempering temperature and soaking time after hardening treatment, widening the application range of structural steels. In this work, we consider the effects of a second tempering treatment on the microstructural properties and impact toughness of a structural steel EN 10025-6 S690 (DIN StE690, W. n: 1.8931). The steel was first forged and quenched in water after austenitization at 890 °C for 4 h. After quenching different tempering treatments were performed, at 590 °C in single or multiple steps. The effect of these treatments was evaluated both in microstructural terms, by means of optical microscopy, scanning and transmission electron microscopy and X-ray diffraction, and in terms of impact toughness. The mechanical behavior was correlated with the microstructure and a remarkable increase in impact toughness was found after the second tempering treatment due to carbide shape change. View Full-Text
Keywords: tempering; impact toughness; carbides; heat treatment; bainite; steel tempering; impact toughness; carbides; heat treatment; bainite; steel
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MDPI and ACS Style

Pezzato, L.; Gennari, C.; Chukin, D.; Toldo, M.; Sella, F.; Toniolo, M.; Zambon, A.; Brunelli, K.; Dabalà, M. Study of the Effect of Multiple Tempering on the Impact Toughness of Forged S690 Structural Steel. Metals 2020, 10, 507. https://doi.org/10.3390/met10040507

AMA Style

Pezzato L, Gennari C, Chukin D, Toldo M, Sella F, Toniolo M, Zambon A, Brunelli K, Dabalà M. Study of the Effect of Multiple Tempering on the Impact Toughness of Forged S690 Structural Steel. Metals. 2020; 10(4):507. https://doi.org/10.3390/met10040507

Chicago/Turabian Style

Pezzato, Luca, Claudio Gennari, Dmitry Chukin, Michele Toldo, Federico Sella, Mario Toniolo, Andrea Zambon, Katya Brunelli, and Manuele Dabalà. 2020. "Study of the Effect of Multiple Tempering on the Impact Toughness of Forged S690 Structural Steel" Metals 10, no. 4: 507. https://doi.org/10.3390/met10040507

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