Experimental Quantification of Critical Parameters for Prediction of Surface Crack Formation in Continuous Casting

Krobath, Roman; Bernhard, Christian

doi:10.1002/srin.202000234

Cited by 7 publications

(4 citation statements)

References 23 publications

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“…The IMC-B-test provides the bending of a sample (200x60x20 mm) after solidification and controlled cooling at temperatures between 700 and 1150 °C, Figure 3. In former research work, mainly defect formation in the continuous casting of steel has been addressed so far, [7]. Possible experimental procedures include bending (pre-defined deformation rate and maximum deflection) and creep testing by applying a constant load and measuring the deflection versus time at a constant temperature.…”

Section: Imc-b Test -In-situ Materials Characterizationmentioning

confidence: 99%

Hot tear prediction in large sized high alloyed turbine steel parts - experimental based calibration of mechanical data and model validation

Klinkhammer

Thorborg

Bernhard

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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The main defects in heavy steel castings are related to hot tear formation during solidification. Depending on the steel grade, design, and local solidification conditions, it is possible to predict regions with higher risk of hot tear formation during the casting process. However, steels containing Boron show more complex crack and defect patterns compared to common steel casting alloys. The mechanisms behind the Boron induced hot tearing is investigated in this work to understand the influence of Boron enrichment during solidification and the influence on hot tearing. The experimental work includes the investigation of phase diagrams and the corresponding fractions of the solid and liquid phases depending on temperature using thermal analysis e.g. DSC and HT-LSCM. The hot tearing sensitivity and mechanical properties during solidification are obtained in the Submerged Split Chill Test, SSCT. In addition IMC-B 3-point bending tests are performed to determine high-temperature material properties in the solid state. The work is part of a research project where the final goal is to improve the hot tear predictions based on experimental work and carry out a benchmark simulation of a real sized casting and use it to show the agreement between the numerical results and extensive non-destructive testing from industrial observations.

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Section: Imc-b Test -In-situ Materials Characterizationmentioning

confidence: 99%

Hot tear prediction in large sized high alloyed turbine steel parts - experimental based calibration of mechanical data and model validation

Klinkhammer

Thorborg

Bernhard

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Based on the change in density with temperature, the strain of the billet was calculated quantitatively using the thermalmechanical-coupled model. Building a perfect 3D model is considerably complicated; thus, we assumed the following: [23,24] 1) the heat transfer along the drawing direction was not considered; 2) the thermophysical parameters of steel were only temperature-dependent and isotropic; and 3) the material was regarded as a continuous material that satisfies the small deformation theory. The initial condition was setting the casting temperature of the molten steel (1550 C).…”

Section: Relationship Between Corner Cracks and Solidification Characteristics Of Steelmentioning

confidence: 99%

Causes of Corner Cracks in Hypoperitectic Microalloyed Steel Billets

Lü

Zhang

Bao

et al. 2021

steel research int.

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Due to the development of continuous casting technology, the incidence of cracks in the continuous casting process has been significantly reduced. However, a few small cracks still appear during the continuous casting of special steel. For instance, cracks often appear at the corner of the billet during the production of hypoperitectic microalloyed steel. Most research on the causes of corner cracks in hypoperitectic microalloyed steel has focused on investigating the hot ductility of steel and not considered the shrinkage characteristics during solidification. Herein, the hot ductility behavior show that cracks are not related to the hot brittleness of steel. The effects of alloy composition on the phase evolution and shrinkage of steel during solidification are focused. Uneven solidification leads to excessive shrinkage of the corners in the billet, and an air gap is generated between the billet and the mold. The return of temperature in the corner of the billet results in the coarseness of the corner grain. Abnormal solidification also results in the severe deformation of the billet, leading to severe wear with the mold, causing Cu to infiltrate into the billet, and further increasing the crack sensitivity of the steel.

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“…These cracks cause the affected slab to be scrapped or ground, resulting in economic loss. [ 1 ] In addition, steel with more alloy elements tends to have worse crack problems than its less‐alloyed counterparts. Researchers have developed various tests in varying solution treatment conditions to return the steel to its original as‐cast microstructure to simulate this behavior in the laboratory.…”

Section: Introductionmentioning

confidence: 99%

Effect of Reheating Temperatures on Hot Ductility and Precipitation Behavior of Low‐Carbon Steels

Sadeghi

Zargar

Lahino

et al. 2022

steel research int.

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The influence of reheating temperatures on hot ductility is investigated in two Ni‐, Mo‐, and Cu‐containing low‐carbon steels. The effects of solution treatment conditions at 1623, 1673 K, and remelting at 1803 K on the reduction in area (RA) are analyzed. The results show an RA trough in the range of 973–1173 K in all experimental conditions. At 973 K, which is close to the Ae3 temperature of both steel grades, ductility drop is caused by the formation of the thin ferrite film at the prior austenite grain boundary. Higher RA values are achieved after reheating to 1623 K, mainly due to smaller austenite grain size by the action of preformed precipitation throughout the matrix. In contrast, increased reheating temperatures result in relatively poor RA values because of the large austenite grain size due to the dissolution of preformed precipitate and reprecipitation at the grain boundaries during cooling. A comparison between two steel grades shows that better ductility at 973 K is achieved in low Ni‐containing steel due to the relatively thick ferrite film. The effects of alloy composition and preformed precipitate's existence on hot ductility are further discussed based on the matrix strengthening and reprecipitation behavior.

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Experimental Quantification of Critical Parameters for Prediction of Surface Crack Formation in Continuous Casting

Cited by 7 publications

References 23 publications

Hot tear prediction in large sized high alloyed turbine steel parts - experimental based calibration of mechanical data and model validation

Hot tear prediction in large sized high alloyed turbine steel parts - experimental based calibration of mechanical data and model validation

Causes of Corner Cracks in Hypoperitectic Microalloyed Steel Billets

Effect of Reheating Temperatures on Hot Ductility and Precipitation Behavior of Low‐Carbon Steels

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