Manufacturing Technology 2020, 20(3):327-334 | DOI: 10.21062/mft.2020.057

Dilatometric identification of bainitic transformation during Q-P processing of 42SiCr medium carbon steel

Štěpán Jeníček, Jiří Vrtáček, Ivan Vorel, Tomáš Janda
University of West Bohemia, Regional Technological Institute, Univerzitní 22, Plzeň, Czech Republic

Q-P process is one of the latest techniques for heat treatment of high-strength steels with increased silicon levels. It is believed to be based on diffusion and migration of carbon between martensite and untransformed austenite, where the latter becomes enriched with carbon, and therefore becomes thermodynamically stable. However, the question remains whether much of the carbon partitioning in the Q-P process might be the result of the competing bainitic transformation induced by arrested quenching below the Ms temperature. This paper explores the use of dilatometry for identifying the products of austenite decomposition during Q-P processing of medium-carbon 42SiCr low-alloy steel.

Keywords: Q-P processing, martensite, bainite, dilatometry
Grants and funding:

The Student grant competition of the University of West Bohemia in Pilsen, SGS 2019-019.

Received: April 29, 2020; Revised: July 30, 2020; Accepted: August 5, 2020; Prepublished online: September 3, 2020; Published: September 7, 2020  Show citation

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Jeníček Š, Vrtáček J, Vorel I, Janda T. Dilatometric identification of bainitic transformation during Q-P processing of 42SiCr medium carbon steel. Manufacturing Technology. 2020;20(3):327-334. doi: 10.21062/mft.2020.057.
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