Manufacturing Technology 2023, 23(1):40-46 | DOI: 10.21062/mft.2023.012

Effect of Refined Spheroidizated Structure on Mechanical Properties of Spring Steel 51CrV4

Jakub Kotous ORCID..., Daniela Nacházelová ORCID..., Jaromír Dlouhý ORCID..., Martin Rund ORCID...
COMTES FHT a.s., Prumyslova 995, 334 41 Dobrany. Czech Republic

The steel 51CrV4 is widely used for production of springs. Materials research into spring steels aims to meet the requirements of industry, which mainly concern high yield and tensile strengths. Ductility has to be retained as the strength is increased. Also, the resistance against brittle fracture is im-portant, measured as fracture toughness. Enhancement of the mentioned mechanical properties can be accomplished by structural refinement. One possible way to refine the final quenched and tem-pered structure is to refine the soft annealed structure before quenching. The article is devoted to the Accelerated Carbide Spheroidisation and Refinement (ASR) with a comparison to conventional soft annealing (SA) in the 51CrV4 spring steel. Both spheroidization treatment (ASR by induction heating, SA by electric furnace) led in different carbide particle sizes. The carbide refinement alters the mate-rial’s behaviour during quenching. Finer carbides dissolve more rapidly during austenitization at the quenching temperature. It is possible to lower the quenching temperature thanks to carbide refine-ment. Mechanical properties after hardening with different quenching temperatures were positively affected too.

Keywords: Accelerated Spheroidization, ASR, Refinement, Quenching, Fracture Toughness
Grants and funding:

The result was supported from ERDF Research of advanced steels with unique properties, No. CZ02.1.01/0.0/0.0/16_019/0000836

Received: December 15, 2022; Revised: March 9, 2023; Accepted: April 6, 2023; Prepublished online: April 24, 2023; Published: May 3, 2023  Show citation

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Kotous J, Nacházelová D, Dlouhý J, Rund M. Effect of Refined Spheroidizated Structure on Mechanical Properties of Spring Steel 51CrV4. Manufacturing Technology. 2023;23(1):40-46. doi: 10.21062/mft.2023.012.
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