Introduction
Bimonthly, started in 1957
Administrator
Shanxi Provincial Education Department
Sponsor
Taiyuan University of Technology
Publisher
Ed. Office of Journal of TYUT
Editor-in-Chief
SUN Hongbin
ISSN: 1007-9432
CN: 14-1220/N
Administrator
Shanxi Provincial Education Department
Sponsor
Taiyuan University of Technology
Publisher
Ed. Office of Journal of TYUT
Editor-in-Chief
SUN Hongbin
ISSN: 1007-9432
CN: 14-1220/N
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The Study on the Formability of Fe-30Mn-9Al-1C Lightweight Steel
DOI:
10.16355/j.cnki.issn1007-9432tyut.2019.04.008
Received:
Accepted:
| Corresponding author | Institute | |
| XING Jia | College of Materials Science and Engineering ,Taiyuan University of Technology ，Taiyuan 030024，China |
abstract:
The strain-hardening index ( n -value) and Lankford value ( r -value) of Fe-30Mn-9Al-1C steel were determined by uniaxial tensile test. Comparing these two values with the test values of three other automotive steels, it was found that Fe-30Mn-9Al-1C steel has good uniaxial deformation capability. However, the results of Erichsen cupping test showed that Fe-30Mn-9Al-1C steel has insufficient crack resistance under biaxial deformation. The reason was that the hard, intergranular κ-carbide particles were prone to crack owing to the concentration of stress in the deformation process. Different from the TWIP steel and TRIP steel of Fe-Mn-C alloy system, the high Al content makes the stacking fault energy of Fe-30Mn-9Al-1C steel reaches 92.7 mJ/m 2, and the deformation mechanism is dominated by dislocation slip. The matrix does not undergo twinning or phase transformation during the plastic deformation, but increases the plasticity through the microband-induced plasticity mechanism.
Keywords:
lightweight steel;formability;κ-carbide;deformation mechanism;dislocation slip