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Differential Microstructure and Properties of Boron Steel Plates Obtained by Water Impinging Jet Quenching Technique
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering. Univ Gavle, Sweden.
Univ Gavle, Sweden; Ericsson AB, Sweden.
Vaderstad Components AB, Sweden.
Linköping University, Department of Management and Engineering, Energy Systems. Linköping University, Faculty of Science & Engineering. Univ Gavle, Sweden.
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2024 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 95, no 1, article id 2300406Article in journal (Refereed) Published
Abstract [en]

Soil-working tools in agriculture are made of boron-containing steels with high wear resistance and hardenability. Nevertheless, these tools are subject to high impacts, abrasive wear, and fatigue and are therefore prone to failure. To combine varying levels of properties within one component in as-quenched condition can be beneficial for such products. To obtain this property variation, a component must undergo a complex and controllable cooling. Therefore, the aim of this work is to obtain a microstructure gradient along two 15 mm-thick steel plates in a newly developed test rig by water jet impingement technique to confirm its controllability and flexibility. Furthermore, a quenching simulation model is created for hardness prediction using phase transformation data from a machine learning tool. Microstructure variation is observed using light optical microscopy and the electron backscatter diffraction technique. Mechanical properties are studied through tensile tests and hardness measurements and are also compared with simulation results. The 0.27 mass% C steel sample is obtained in almost fully martensitic state transitioning to a softer ferritic/bainitic condition, while the 0.38 mass% C steel sample results predominantly into a fully hardened martensitic state and slightly shows ferritic and bainitic features along the sample. The quenching simulation model shows promising hardness prediction for both steels. A newly developed impinging jet quenching technique is used for differential quenching of 15 mm-thick boron steel sheets with the aim of obtaining microstructure and property gradients along their lengths. As a result, combinations of differential hardness profiles along with varying hardening degrees are produced and metallurgically characterized through microstructure observations and mechanical tests.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2024. Vol. 95, no 1, article id 2300406
Keywords [en]
boron steel; critical cooling rate; differential quenching; hardenability; martensite
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:liu:diva-198813DOI: 10.1002/srin.202300406ISI: 001082647000001OAI: oai:DiVA.org:liu-198813DiVA, id: diva2:1808137
Note

Funding Agencies|The present study was financed by Swedenapos;s Innovation Agency Vinnova (grant no. 2017-02281) and by the Swedish Agency for Economic and Regional Growth (grant no. 20201438). [2017-02281]; Swedenapos;s Innovation Agency Vinnova [20201438]; Swedish Agency for Economic and Regional Growth

Available from: 2023-10-30 Created: 2023-10-30 Last updated: 2024-04-11

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