PSI - Issue 23

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 ScienceDirect Available online at www.sciencedirect.com

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Procedia Structural Integrity 23 (2019) 547–552

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers © 201 9 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. Abstract The pap r deals with the mic ost uc ure evolution of middle alloyed high strength 33NiCrMoV15 steel treated by various quench rates fr m rapid to very slow ooling rates. All used heat re ments wer simulated on real experimental samp es with usi g of dilatom ter DIL805A. Afterward, the samples were observed by light microscopy to escribe microstructure after every cooling conditions. Finally, some structure constituents were investigated in more details by in-situ SPM scan and their local mechanical properties were evaluated by quasistatic nanoindentation. Both SPM scan and nanoindentations were performed by nanoindentor Hysitron TI950. © 201 9 The Autho s. Publ shed by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) P er-review under responsibility of the scient fic c mmittee of the IC MSMF organizers. 9th International Conference on Materials Structure and Micromechanics of Fracture Structure evolution of 33NiCrMoV15 steel after its processing by various quenching conditions Igor Barényi a * , Jozef Majerík a , Michal Krbaťa a a Alexander Dubček University of Trencin, Faculty of special technology, Pri Parku 19, 911 06, Trencin, Slovak Republic Abstract The paper deals with the microstructure evolution of middle alloyed high strength 33NiCrMoV15 steel treated by various quenching rates from rapid to very slow cooling rates. All used heat treatments were simulated on real experimental samples with using of dilatometer DIL805A. Afterward, the samples were observed by light microscopy to describe microstructure after every cooling conditions. Finally, some structure constituents were investigated in more details by in-situ SPM scan and their local mechanical properties were evaluated by quasistatic nanoindentation. Both SPM scan and nanoindentations were performed by nanoindentor Hysitron TI950. 9th International Conference on Materials Structure and Micromechanics of Fracture Structure evolution of 33NiCrMoV15 steel after its processing by various quenching conditions Igor Barényi a * , Jozef Majerík a , Michal Krbaťa a a Alexander Dubček University of Trencin, Faculty of special technology, Pri Parku 19, 911 06, Trencin, Slovak Republic Keywords: NiCrMoV steel, quenching, nanoidentation, local mechanical properties, dilatometry

Keywords: NiCrMoV steel, quenching, nanoidentation, local mechanical properties, dilatometry

1. Introduction

1. Introduction

Investigated steel 33NiCrMoV belongs to the group of ultra-high strength low alloy martensitic steels. The steel combine high strength with good ductility, fatigue strength and creep resistance. One of the main applications of the steel is howitzer gun barrel production where the described properties are advantageously employed. The paper presents the evaluation of microstructure of the 33NiCrMoV steel after its processing by various quenching regimes from rapid to very slow cooling rate. In NiCrMoV type of steels, the presence of some types of carbides based on Fe, Investigated steel 33NiCrMoV belongs to the group of ultra-high strength low alloy martensitic steels. The steel combine high strength with good ductility, fatigue strength and creep resistance. One of the main applications of the steel is howitzer gun barrel production where the described properties are advantageously employed. The paper presents the evaluation of microstructure of the 33NiCrMoV steel after its processing by various quenching regimes from rapid to very slow cooling rate. In NiCrMoV type of steels, the presence of some types of carbides based on Fe,

* Corresponding author. Tel.: +421 32 7400 210; . E-mail address: igor.barenyi@tnuni.sk

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. * Corresponding author. Tel.: +421 32 7400 210; . E mail address: igor.barenyi@tnuni.sk

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers 10.1016/j.prostr.2020.01.143