Welding of 42SiCr treated by quenching and partitioning—mechanical properties of the HAZ and preheating proposal

Kaars, Jonny; Dittrich, Fabian; Mayr, Peter; Hensel, Jonas

doi:10.1007/s40194-025-02032-3

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Title:: Welding of 42SiCr treated by quenching and partitioning—mechanical properties of the HAZ and preheating proposal
Document type:: Zeitschriftenaufsatz
Author(s):: Kaars, Jonny; Dittrich, Fabian; Mayr, Peter; Hensel, Jonas
Abstract:: A 42SiCr experimental steel was heat-treated by the quenching and partitioning (Q&P) heat treatment to achieve a combination of high strength and ductility. The associated microstructure is characterized in literature by finely distributed martensite laths with a small volume fraction of retained austenite embedded. The goal of this work is to provide a comprehensive characterization of the mechanical properties of all subzones in the heat-affected zone (HAZ) of welded 42SiCr-Q&P steel. Dedicated microspecimens were subjected to a specifically selected thermal cycle in a dilatometer and characterized by mechanical testing and microstructural assessment. One specimen series is dedicated to the assessment of the mechanical properties of the material after welding; another four specimen series represent some carefully selected strategies to mitigate adverse effects of welding. Tensile testing revealed a decrease in yield strength in the HAZ by up to 35%. The ductility of the material showed inverse behavior. Material in the supercritical zone shows > 2000 MPa of ultimate strength, but at the same time is very brittle. The most remarkable result showed that the embrittlement in the supercritical zone can be successfully mitigated by holding the material at temperatures in the range of 200–250 °C for 5 min upon cooling, resulting in a yield strength of around 1400 MPa along with a ductility of > 10%, restoring the desired property combination. This very promising observation suggests fusion welding of 42SiCr-Q&P might be possible by means of preheating, maintaining the superior mechanical properties of Q&P in the weld.
Keywords:: Quenching and partitioning · 42SiCr · HAZ · Welding · Tensile strength · Fracture strain · Hardness
Journal title:: Welding in the World
Year:: 2025
Year / month:: 2025-04
Covered by:: Scopus
Reviewed:: ja
Language:: en
Fulltext / DOI:: doi:10.1007/s40194-025-02032-3
WWW:: https://doi.org/10.1007/s40194-025-02032-3
Publisher:: Springer Science and Business Media LLC
E-ISSN:: 0043-22881878-6669
Submitted:: 09.09.2024
Accepted:: 27.03.2025
Date of publication:: 10.04.2025
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