Effect of Multiple Water Impinging Jet Array on Quenching Hot Rotary Hollow Cylinders

Jahedi, Mohammad; Moshfegh, Bahram

doi:10.11159/ffhmt20.171

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…The technique has already shown its high flexibility in previous studies associated with quenching of steel plates and hollow cylinders. [16][17][18][19][20][21] The flexibility of the experiments and the knowledge of relationship between the flow rates and the quality of final products can significantly contribute to further improvements of steel production lines, specifically to reduction of unnecessary resources, such as excess quenching medium or no longer necessary alloying elements, and in this way contribute to emission reduction. Furthermore, simulation of quenching combined with the physical experiments can contribute to these improvements by providing a better understanding of the ongoing processes during quenching and reducing the experimental design time.…”

Section: Introductionmentioning

confidence: 99%

Hardening of Cylindrical Bars with Water Impinging Jet Quenching Technique

Romanov,

Jahedi,

Carlestam

et al. 2024

steel research int.

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Hardening of carbon steel products by austenitization and immersion in a quenching medium is a widely used heat treatment to obtain a hard and strong martensitic structure. To avoid the undesired consequences, such as residual stresses or insufficient hardening depth, the cooling rates must be accurately measured and controlled. This can be achieved using the impinging water jet quenching technique. The aim of this work is to perform hardening of four low‐alloyed 70 mm cylindrical carbon steel bars, using impinging water jet quenching technique with different jet flow rates, and to analyze its effect on thermal evolution and residual stresses. The temperature evolution during quenching experiments is recorded and used as input to a comprehensive quenching model to predict phase transformations, final hardness, and residual stresses of cylindrical bars. All four quenching experiments result in a fully hardened martensitic state. Furthermore, a decrease in jets’ flow rate, within a certain interval, results in different thermal histories and in lower compressive residual stresses on the surface. The results from quenching simulations show promising hardness, microstructure, and residual stress predictions that are validated by hardness measurements, optical microscopy, and residual stress analysis using X‐Ray diffraction method.

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Section: Introductionmentioning

confidence: 99%

Hardening of Cylindrical Bars with Water Impinging Jet Quenching Technique

Romanov,

Jahedi,

Carlestam

et al. 2024

steel research int.

Self Cite

View full text Add to dashboard Cite

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Differential Microstructure and Properties of Boron Steel Plates Obtained by Water Impinging Jet Quenching Technique

Romanov,

Jahedi,

Bäckström

et al. 2023

steel research int.

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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, fatigue and 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 was created for hardness prediction using phase transformation data from a machine learning tool. Microstructure variation was observed using light optical microscopy and the electron backscatter diffraction technique. Mechanical properties were studied through tensile tests and hardness measurements, and also compared with simulation results. 0.27 mass‐% C steel sample obtained almost fully martensitic state transitioning to a softer ferritic/bainitic condition, while the 0.38 mass‐% C steel sample resulted predominantly in a fully hardened martensitic state slightly showing ferritic and bainitic features along the sample. The quenching simulation model showed promising hardness prediction for both steels.This article is protected by copyright. All rights reserved.

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Effect of Multiple Water Impinging Jet Array on Quenching Hot Rotary Hollow Cylinders

Cited by 2 publications

References 16 publications

Hardening of Cylindrical Bars with Water Impinging Jet Quenching Technique

Hardening of Cylindrical Bars with Water Impinging Jet Quenching Technique

Differential Microstructure and Properties of Boron Steel Plates Obtained by Water Impinging Jet Quenching Technique

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