The development of ultrafine-grained hot rolling products using advanced thermomechanical processing

Muszka, Krzysztof; Dziedzic, D.; Madej, Łukasz; Majta, Janusz; Hodgson, Peter; Palmiere, E.J.

doi:10.1016/j.msea.2014.05.051

Cited by 12 publications

(8 citation statements)

References 13 publications

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“…Based on fundamental research in Germany, USA, UK, Germany, and Japan, the fundamental understanding was further developed in metallurgical laboratories. Pioneers at that time were Haneke, Schmidtmann, Meyer, Kaspar, Streißelberger, DeArdo, Jonas, Sellars, Hodgson, Tamura und Tanaka, Saito, Ouchi, Militzer, and many others. The basic idea was to improve the strength and toughness behavior of structural steels by grain refining.…”

Section: A Brief Historical Reviewmentioning

confidence: 99%

Thermomechanical Treatment of Steels - A Real Disruptive Technology Since Decades

Buchmayr

2017

steel research int.

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The basic concept of thermomechanical treatment (TMT) or thermomechanical controlled processing (TMCP) is responsible for the development of many advanced steel grades with improved mechanical properties during the last 50 years. A retroperspective view, an explanation of the most important influencing factors and a presentation of the enormous benefits for the costumer are given in this review. A sound knowledge on the synergism of recrystallization, precipitation, and transformation phenomena forms the basis to produce fine, homogeneous microstructures with improved properties. Starting from structural steels, improvements can be achieved with respect to higher strength and toughness values combined with better weldability and formability, mainly based on reduction of carbon content and finer grain sizes. The benefits in the application areas are described in detail. TMCP is not only used for flat products, but also for long products and forgings of different steel grades. Physical simulation and modeling contribute significantly to these developments, which also form the basis for computer-aided control or real-time online-models. In the next years, a complete shift to cyber physical systems (CPS) is predicted, which needs an aligned education effort. REVIEW A Brief Historical ReviewSince the mid-sixties, steel mills began to produce fine grained structural steels by lowering the final rolling temperature. Based on fundamental research in Germany, USA, UK, Germany, and Japan, the fundamental understanding was further developed in metallurgical laboratories. Pioneers at that time were Haneke, [10] Schmidtmann, [11,12] Meyer, [13,14] Kaspar, [15][16][17][18][19][20][21][22][23][24] Streißelberger, [9,15,[25][26][27] DeArdo, [28,29] Jonas, [30][31][32][33] Sellars, [34][35][36][37] Hodgson, [38][39][40][41][42] Tamura und Tanaka, [43] Saito, [44] Ouchi, [45] Militzer, [46,47] and many others. The basic idea was to improve the strength and toughness behavior of structural steels by grain refining. Compared to conventional hot rolling at high rolling temperatures, the new steels were rolled at lower final rolling temperature. It was found that repeated recrystallization of the austenite structures leads to a decrease of grain size, but there is a limit, which is difficult to overcome. Deformation at temperatures, where no recrystallization takes place was successful in the conditioning of austenite having a dense population of glide planes, high dislocation density, and a high intrinsic energy, which provided a high density of nucleation sites for the transformation products of austenite.At the beginning, mainly ferrite plus pearlite microstructures were considered and later the role of rapid cooling became an additional opportunity to increase the strength level.Higher cooling rates or higher undercooling increase the driving force and with a lower diffusivity a finer microstructure like bainite and martensite can be reached.A comparison of the contributions of the strengthening mechanism in a commercial hot rolle...

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Section: A Brief Historical Reviewmentioning

confidence: 99%

Thermomechanical Treatment of Steels - A Real Disruptive Technology Since Decades

Buchmayr

2017

steel research int.

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“…In the last decade, extensive research in the area of strong and ductile ultrafine‐grained (UFG) or nanostructured (NS) materials has been observed. These groups of structural materials, that already can be produced in the continuous manner, very often are characterized by microstructural features organized in clusters or layers . Application of microalloyed steel gives additional opportunity to obtain the highest grain refinement, thereby improving mechanical properties of UFG materials .…”

Section: Introductionmentioning

confidence: 99%

“…These groups of structural materials, that already can be produced in the continuous manner, very often are characterized by microstructural features organized in clusters or layers . Application of microalloyed steel gives additional opportunity to obtain the highest grain refinement, thereby improving mechanical properties of UFG materials . These materials can be produced using severe plastic deformation (SPD) and advanced thermomechanical processing (ATP) or a combination of these methods .…”

Section: Introductionmentioning

confidence: 99%

Microalloyed Steels Laminated Composites Processed by the High‐Strain Rate Compression Tests

et al. 2018

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Multilayered metal-to-metal (MM) composites have been gathering much interest in the last decades because of its extraordinary mechanical properties. In the present study, the microstructural changes and mechanical behavior of two grades of microalloyed steels, that is, ferrite (M_F) and austenite (M_A), in the MM composite systems have been investigated and analyzed. In the present study, the Surface Mechanical Attrition Treatment (SMAT) is applied to introduce initial gradual microstructural changes in steel plates. Considerable microstructural refinement occurs as a result of the accumulated plastic deformation during the SMAT process. In the next step, specimens are again deformed by compression then stocked and compressed using drop weight test with a high strain rate of 1000 s À1 , resulting in equivalent plastic strain of e ¼ 0,8.It is found that plastic pre-deformation, significantly affected the distributions of the equivalent strains and stresses in both materials, but differently. Bonding quality of the laminated MM composites, using SEM and EBSD technique, is analyzed. The rheological properties of particular layers in the investigated M_F and M_A multilayered composites are defined using hardness measurements. Such a procedure demonstrated the work hardening gradients of the samples that are subjected subsequently to the SMAT, high-strain rate compression, and bonding processes.

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“…casting temperature, chemical composition and cooling rate [4][5][6]. The design process of metal forming of the microalloyed steels should also be carried out with a special thermomechanical control [7][8][9]. The production process of the ultrafine grained microalloyed steel products is controlled by several metallurgical issues, starting from continuous casting through the thermomechanical hot rolling process, up to the cold severe plastic deformation processes [10].…”

Section: Introductionmentioning

confidence: 99%

Selected Problems of the Microstructure Evolution During Microalloyed Steel Wire Rod Production Process

Kwiecień

Graca

Muszka

et al. 2017

Archives of Metallurgy and Materials

Self Cite

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In the present study, we have discussed the selected problems of microstructure development during the whole manufacturing process, i.e. continuous casting, thermomechanical processing, and cold metal forming of the microalloyed steels wires. In the investigated steels, the microstructure development was controlled by the history of deformation and by the effects of microalloying elements, mostly Nb, Ti, and B. It has been concluded that obtained in the ultrafine grained microalloyed steel wires mechanical properties were first of all resulting from specific structural composition and grain refinement. Additionally, it has been proven that austenite grain refinement, that increases nucleation rate during the austenite-to-ferrite phase transformation, as a result of the thermomechanical processing, are very beneficial from point of view of the final mechanical properties. This problem starts to be very important when the microalloyed steel products are subjected to severe plastic deformation, as it has been shown discussed in the present work for combined processes of wire drawing and wire flattening.

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The development of ultrafine-grained hot rolling products using advanced thermomechanical processing

Cited by 12 publications

References 13 publications

Thermomechanical Treatment of Steels - A Real Disruptive Technology Since Decades

Thermomechanical Treatment of Steels - A Real Disruptive Technology Since Decades

Microalloyed Steels Laminated Composites Processed by the High‐Strain Rate Compression Tests

Selected Problems of the Microstructure Evolution During Microalloyed Steel Wire Rod Production Process

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