Steel symbol/number: 22MnB5/1.5528

Spittel, M.; Spittel, T.

doi:10.1007/978-3-540-44760-3_146

“…As determined by atomic emission spectroscopy, the chemical composition of the used steel charge is in accordance with the norm values [10]: C -0.23, Si -0.30, Mn -1.23, Cr -1.16, Ti -0.04, B -0.0031, balance Fe, in wt.-%. In the initial asdelivered state, it consists of ferrite -white areas in Fig.…”

Section: Methodssupporting

confidence: 53%

“…2). The physical properties of 22MnB5 were based on literature data [10,31,32] and modelled temperature dependent. In order to take the Curie temperature and hence, the change of the magnetic properties into account, a finite number of calculation steps within the steady-state task was specified with prescribed intervals of heating time.…”

Section: Virtual Design Of Tube Heat-treatmentmentioning

confidence: 99%

Virtual Design and Validation

Rubio¹,

Chamoin²,

Louf³

2020

Lecture Notes in Applied and Computational Mechanics

0

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Application of products with properties locally adapted for specific loads and requirements has become widespread in recent decades. In the present study, an innovative approach to manufacture tubes with tailored properties in the longitudinal direction from a boron-alloyed steel 22MnB5 was developed. Due to advanced heating and cooling strategies, a wide spectrum of possible steel phase compositions can be obtained in tubes manufactured in a conventional tube forming line. A heat-treatment station placed after the forming line is composed of an inductive heating and an adapted water-air cooling spray system. These short-action processes allow fast austenitizing and subsequent austenite decomposition within several seconds. To describe the effect of high inductive heating rates on austenite formation, dilatometric investigations were performed in a heating rate range from 500 K s-1 to 2500 K s-1. A completed austenitizing was observed for the whole range of the investigated heating rates. The austenitizing was described using Johnson-Mehl-Avrami model. Furthermore, series of experiments on heating and cooling with different cooling rates in the developed technology line was carried out. Complex microstructures were obtained for the cooling in still as well as with compressed air, while the water-air cooling at different pressures resulted in quenched martensitic microstructures. Nondestructive testing of the mechanical properties and the phase composition was realized by means of magnetization measurements. Logarithmic models to predict the phase composition and hardness values from the magnetic properties were obtained. Subsequently, a simulation model allowing virtual design of tubes in the FE-software ANSYS was developed on basis of experimental data. The model is suited to predict microstructural and mechanical properties under consideration of the actual process parameters.

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“…The general material properties (e.g. density, heat capacity) are defined according to the Landolt-Börnstein Database [7]. At the symmetry axis and at the circumference of the sheet boundary conditions are applied, which both prevent any material flow in radial direction.…”

Section: Bulge Test Simulationmentioning

confidence: 99%

“…Since the specimen will be heated without any contact with the die or the blank holder (see section "Test bench"), the finite element model consists only of a specimen with the dimensions of 240 mm x 130 mm x 2 mm. The general material properties are defined according to the Landolt-Börnstein database [7]. The electric conductivity of the specimen is calculated by using the thermal conductivity in combination with the Wiedemann-Franz-law [10].…”

Section: Heatingmentioning

confidence: 99%

Development of a Pneumatic Bulge Test for High Temperatures and Controlled Strain Rates

Braun

¹

,

Storz

²

,

Bambach�

³

2014

AMR

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Due to new material concepts (e.g. boron-manganese steels), hot stamping of sheet metal parts has emerged in order to produce high strength components. Thereby, the design of hot stamping processes by means of finite element simulations requires information about the thermo-mechanical material behaviour up to high strain levels at various temperatures as simulation input. It is known that hot tensile tests are only evaluable until low strain levels. Therefore, a hot gas bulge test for temperatures in the range of 600 °C to 900 °C and strain rates up to 1/s is being developed. In order to design such a hot gas bulge test, the requirements (e.g. forming pressure) are estimated by finite element simulations. The result is a test bench, which already enables a pneumatic forming of specimens at room temperature and pressures up to 200 bar without any unexpected side effects.

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Manufacturing and Virtual Design to Tailor the Properties of Boron-Alloyed Steel Tubes

Hordych

¹

,

Herbst

²

,

Nürnberger

³

et al. 2020

Virtual Design and Validation

2

0

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Application of products with properties locally adapted for specific loads and requirements has become widespread in recent decades. In the present study, an innovative approach to manufacture tubes with tailored properties in the longitudinal direction from a boron-alloyed steel 22MnB5 was developed. Due to advanced heating and cooling strategies, a wide spectrum of possible steel phase compositions can be obtained in tubes manufactured in a conventional tube forming line. A heat-treatment station placed after the forming line is composed of an inductive heating and an adapted water-air cooling spray system. These short-action processes allow fast austenitizing and subsequent austenite decomposition within several seconds. To describe the effect of high inductive heating rates on austenite formation, dilatometric investigations were performed in a heating rate range from 500 K s-1 to 2500 K s-1. A completed austenitizing was observed for the whole range of the investigated heating rates. The austenitizing was described using Johnson-Mehl-Avrami model. Furthermore, series of experiments on heating and cooling with different cooling rates in the developed technology line was carried out. Complex microstructures were obtained for the cooling in still as well as with compressed air, while the water-air cooling at different pressures resulted in quenched martensitic microstructures. Nondestructive testing of the mechanical properties and the phase composition was realized by means of magnetization measurements. Logarithmic models to predict the phase composition and hardness values from the magnetic properties were obtained. Subsequently, a simulation model allowing virtual design of tubes in the FE-software ANSYS was developed on basis of experimental data. The model is suited to predict microstructural and mechanical properties under consideration of the actual process parameters.

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Steel symbol/number: 22MnB5/1.5528

Cited by 10 publications

References 0 publications

Virtual Design and Validation

Virtual Design and Validation

Development of a Pneumatic Bulge Test for High Temperatures and Controlled Strain Rates

Manufacturing and Virtual Design to Tailor the Properties of Boron-Alloyed Steel Tubes

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