Details
| Original language | English |
|---|---|
| Pages (from-to) | 271-280 |
| Number of pages | 10 |
| Journal | Steel research international |
| Volume | 88 |
| Issue number | 2 |
| Publication status | Published - 1 Feb 2017 |
Abstract
Modified press-hardening processes are very attractive for manufacturing safety-relevant vehicle body parts from steels with martensitic–ferritic microstructures. In the process developed, the formation of the two-phase microstructure and the hot sheet forming simultaneously occur subsequently to an intercritical annealing. By contrast, previously used process chains do not integrate setting of a multi-phase microstructure within the forming step. In order to successfully combine the intercritical annealing with the actual forming, comprehensive knowledge of the microstructural evolution and the resulting mechanical properties is needed. Specifically, different heat-treating routes are used to obtain different microstructures of ferritic–martensitic dual-phase steels and partial martensitic steels. As a result of intercritical annealing in the temperature range of Ac1–Ac3, it is possible to vary the martensite volume fractions from 7 to 96 vol%. The data obtained can be employed for numerically describing the microstructural transformation and for designing the heat treatment process. It is demonstrated that this combined process allows for designing steels that feature properties that are similar to complex-phase steels.
Keywords
- 22MnB5, dual-phase steel, intercritical annealing, LH800, partial martensitic steel
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
- Chemistry(all)
- Physical and Theoretical Chemistry
- Materials Science(all)
- Metals and Alloys
- Materials Science(all)
- Materials Chemistry
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In: Steel research international, Vol. 88, No. 2, 01.02.2017, p. 271-280.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The Effect of Intercritical Annealing on the Microstructure and Mechanical Properties of Ferritic–Martensitic Two-Phase Steels
AU - Wolf, Lars Oliver
AU - Nürnberger, Florian
AU - Rodman, Dmytro
AU - Maier, Hans Jürgen
N1 - Funding Information: The authors thank the German Research Foundation (DFG) for financial support of project A2 “Process Adapted Dual Phase Steels” within the framework of the International Research and Training Group (IRTG) 1627.
PY - 2017/2/1
Y1 - 2017/2/1
N2 - Modified press-hardening processes are very attractive for manufacturing safety-relevant vehicle body parts from steels with martensitic–ferritic microstructures. In the process developed, the formation of the two-phase microstructure and the hot sheet forming simultaneously occur subsequently to an intercritical annealing. By contrast, previously used process chains do not integrate setting of a multi-phase microstructure within the forming step. In order to successfully combine the intercritical annealing with the actual forming, comprehensive knowledge of the microstructural evolution and the resulting mechanical properties is needed. Specifically, different heat-treating routes are used to obtain different microstructures of ferritic–martensitic dual-phase steels and partial martensitic steels. As a result of intercritical annealing in the temperature range of Ac1–Ac3, it is possible to vary the martensite volume fractions from 7 to 96 vol%. The data obtained can be employed for numerically describing the microstructural transformation and for designing the heat treatment process. It is demonstrated that this combined process allows for designing steels that feature properties that are similar to complex-phase steels.
AB - Modified press-hardening processes are very attractive for manufacturing safety-relevant vehicle body parts from steels with martensitic–ferritic microstructures. In the process developed, the formation of the two-phase microstructure and the hot sheet forming simultaneously occur subsequently to an intercritical annealing. By contrast, previously used process chains do not integrate setting of a multi-phase microstructure within the forming step. In order to successfully combine the intercritical annealing with the actual forming, comprehensive knowledge of the microstructural evolution and the resulting mechanical properties is needed. Specifically, different heat-treating routes are used to obtain different microstructures of ferritic–martensitic dual-phase steels and partial martensitic steels. As a result of intercritical annealing in the temperature range of Ac1–Ac3, it is possible to vary the martensite volume fractions from 7 to 96 vol%. The data obtained can be employed for numerically describing the microstructural transformation and for designing the heat treatment process. It is demonstrated that this combined process allows for designing steels that feature properties that are similar to complex-phase steels.
KW - 22MnB5
KW - dual-phase steel
KW - intercritical annealing
KW - LH800
KW - partial martensitic steel
UR - http://www.scopus.com/inward/record.url?scp=84973365228&partnerID=8YFLogxK
U2 - 10.1002/srin.201600107
DO - 10.1002/srin.201600107
M3 - Article
AN - SCOPUS:84973365228
VL - 88
SP - 271
EP - 280
JO - Steel research international
JF - Steel research international
SN - 1611-3683
IS - 2
ER -