Details
| Original language | English |
|---|---|
| Title of host publication | Proceedings 29th International Conference on Metallurgy and Materials |
| Pages | 573-578 |
| Number of pages | 6 |
| ISBN (electronic) | 9788087294970 |
| Publication status | Published - 27 Jul 2020 |
| Event | 29th International Conference on Metallurgy and Materials, METAL 2020 - Brno, Czech Republic Duration: 20 May 2020 → 22 May 2020 |
Abstract
Due to the efficient combination of a forming step with a consecutive heat treatment, hot-stamping has become an established technology for the production of high strength steel parts in the automotive industry. In the beginning, sheets are heated above austenitisation temperature and held in order to obtain a fully austenised microstructure, then formed and instantly quenched in the forming tool. To achieve the desired increase in tensile strength for the widely used manganese boron steel 22MnB5, cooling rates of at least 27 K/s are necessary. This requirement sets a high demand on the numerical process simulation in order to being able to predict the occurrence of component or process errors with a high degree of certainty. To achieve this, the exact knowledge of the local heat transfer coefficient is necessary, which dominantly determines the temperature distribution within the work piece and the die. Since there is none standardised test method for the determination of heat transfer coefficients exists, a practical test method is presented in this study. In addition to the use of a divisible temperature-measuring stamp, the method is based on a close coupling of practical experiment and iterative numerical simulation. With the method and tools shown in the scope of this paper, the heat transfer coefficient could be successfully determined as a function of contact pressure and tool start temperature, taking the process route of hot-stamping into account. Results are compared with literature knowledgeorder to demonstrate the performance of the determination method.
Keywords
- Experimental determination method, Heat transfer coefficient, Hot-stamping, Numerical coupling
ASJC Scopus subject areas
- Engineering(all)
- Mechanics of Materials
- Materials Science(all)
- Metals and Alloys
- Materials Science(all)
- Surfaces, Coatings and Films
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Proceedings 29th International Conference on Metallurgy and Materials. 2020. p. 573-578.
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Practical Process Characterisation For Hot-Stamping Regarding The Heat Transfer Coefficient Using A Numerical And Experimental Coupled Method
AU - Behrens, Bernd Arno
AU - Brunotte, Kai
AU - Wester, Hendrik
AU - Müller, Felix
N1 - Funding Information: The authors gratefully acknowledge the support the German Federation of Industrial Research Associations (AiF) within the project 19518 N for this research work.
PY - 2020/7/27
Y1 - 2020/7/27
N2 - Due to the efficient combination of a forming step with a consecutive heat treatment, hot-stamping has become an established technology for the production of high strength steel parts in the automotive industry. In the beginning, sheets are heated above austenitisation temperature and held in order to obtain a fully austenised microstructure, then formed and instantly quenched in the forming tool. To achieve the desired increase in tensile strength for the widely used manganese boron steel 22MnB5, cooling rates of at least 27 K/s are necessary. This requirement sets a high demand on the numerical process simulation in order to being able to predict the occurrence of component or process errors with a high degree of certainty. To achieve this, the exact knowledge of the local heat transfer coefficient is necessary, which dominantly determines the temperature distribution within the work piece and the die. Since there is none standardised test method for the determination of heat transfer coefficients exists, a practical test method is presented in this study. In addition to the use of a divisible temperature-measuring stamp, the method is based on a close coupling of practical experiment and iterative numerical simulation. With the method and tools shown in the scope of this paper, the heat transfer coefficient could be successfully determined as a function of contact pressure and tool start temperature, taking the process route of hot-stamping into account. Results are compared with literature knowledgeorder to demonstrate the performance of the determination method.
AB - Due to the efficient combination of a forming step with a consecutive heat treatment, hot-stamping has become an established technology for the production of high strength steel parts in the automotive industry. In the beginning, sheets are heated above austenitisation temperature and held in order to obtain a fully austenised microstructure, then formed and instantly quenched in the forming tool. To achieve the desired increase in tensile strength for the widely used manganese boron steel 22MnB5, cooling rates of at least 27 K/s are necessary. This requirement sets a high demand on the numerical process simulation in order to being able to predict the occurrence of component or process errors with a high degree of certainty. To achieve this, the exact knowledge of the local heat transfer coefficient is necessary, which dominantly determines the temperature distribution within the work piece and the die. Since there is none standardised test method for the determination of heat transfer coefficients exists, a practical test method is presented in this study. In addition to the use of a divisible temperature-measuring stamp, the method is based on a close coupling of practical experiment and iterative numerical simulation. With the method and tools shown in the scope of this paper, the heat transfer coefficient could be successfully determined as a function of contact pressure and tool start temperature, taking the process route of hot-stamping into account. Results are compared with literature knowledgeorder to demonstrate the performance of the determination method.
KW - Experimental determination method
KW - Heat transfer coefficient
KW - Hot-stamping
KW - Numerical coupling
UR - http://www.scopus.com/inward/record.url?scp=85096766525&partnerID=8YFLogxK
U2 - 10.37904/metal.2020.3522
DO - 10.37904/metal.2020.3522
M3 - Conference contribution
AN - SCOPUS:85096766525
SP - 573
EP - 578
BT - Proceedings 29th International Conference on Metallurgy and Materials
T2 - 29th International Conference on Metallurgy and Materials, METAL 2020
Y2 - 20 May 2020 through 22 May 2020
ER -