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| 2. |
- Lundberg, Sven-Erik
(författare)
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Chapter 3: Roll Pass Design
- 2017
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Ingår i: The Making, Shaping and Treating of Steel. - Warrendale, PA : Association for Iron & Steel Technology (AIST). - 9781935117575 ; , s. 337-412
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 3. |
- Lundberg, Sven-Erik, et al.
(författare)
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Chapter 4: Production of Bar and Light Sections
- 2017
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Ingår i: The Making, Shaping and Treating of Steel. - Warrendale, PA : Association for Iron & Steel Technology (AIST). - 9781935117575 ; , s. 413-507
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 4. |
- Lundberg, Sven-Erik, et al.
(författare)
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Chapter 7: Manufacture of Steel Tubular Products
- 2017
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Ingår i: The Making, Shaping and Treating of Steel. - Warrendale, PA : Association for Iron & Steel Technology (AIST). - 9781935117575 ; , s. 657-729
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 5. |
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| 6. |
- Romanov, Pavel, et al.
(författare)
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Differential Microstructure and Properties of Boron Steel Plates Obtained by Water Impinging Jet Quenching Technique
- 2024
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Ingår i: Steel Research International. - : WILEY-V C H VERLAG GMBH. - 1611-3683 .- 1869-344X. ; 95:1
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 7. |
- Romanov, Pavel, et al.
(författare)
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Hardening of Cylindrical Bars with Water Impinging Jet Quenching Technique
- 2024
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Ingår i: Steel Research International. - : Wiley. - 1611-3683 .- 1869-344X.
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Tidskriftsartikel (refereegranskat)abstract
- 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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| 8. |
- Romanov, Pavel, et al.
(författare)
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Quenching of Carbon Steel Plates with Water Impinging Jets: Differential Properties and Fractography
- 2023
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Ingår i: Procedia Structural Integrity. - : Elsevier. ; 43, s. 154-159
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Konferensbidrag (refereegranskat)abstract
- The demand for steel components with tailored properties is constantly growing. To obtain a specific variation of microstructuresand mechanical properties along the component it must undergo a controllable cooling. One way to control the cooling rates alongthe component is by using different simultaneous water jet impingements on a hot austenitized surface. This can be done by anewly developed test rig for water Impinging Jet Quenching Technique (IJQT). This work discusses the effect of IJQT onmechanical properties and fracture behavior of 15 mm steel plates containing 0.27 and 0.38 mass-% carbon. The samples werecooled in a specifically designed setup of the technique to obtain simultaneous water and air cooling resulting in diversemicrostructures. The mechanical property gradients of both steels were analyzed through hardness measurements and tensile tests.The fracture surfaces and the near fracture regions were observed using scanning electron microscope and light optical microscoperespectively.The results from tensile tests showed that the larger part of the sample with higher carbon content was fully hardened, howeversmoothly transitioning to a more ductile region. The sample with lower carbon content combined various degrees of hardening andtransitioned from higher to lower ultimate tensile strength values. Fracture behavior of higher carbon steel was predominantlybrittle transitioning to a ductile, while the lower carbon steel had a small region showing brittle fracture transitioning to a largerregion of predominant ductile fracture behavior.
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| 9. |
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| 10. |
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The Making, Shaping and Treating of Steel : Long Products Volume
- 2017
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Samlingsverk (redaktörskap) (övrigt vetenskapligt/konstnärligt)abstract
- This book provides a detailed description of what long products are, how they are classified, how they are produced, as well as the types of equipment that produce long products. The volume provides a comprehensive overview of long product production from describing the roll pass design, to the different shapes and sections, to the manufacturing of wire and wire products, to tubular products, and finally to high-alloy steel semi-finished products by casting and ingots.
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