On deformation twinning in a 17.5%Mn-TWIP steel: A physically-based phenomenological model

Journal Article · Tue Jan 25 04:00:00 EST 2011 · Materials Science and Engineering. A. Structural Materials: Properties, Microstructure and Processing, 528(3):1402-1408

DOI:https://doi.org/10.1016/j.msea.2010.10.031· OSTI ID:1005131

Soulami, Ayoub; Choi, Kyoo Sil; Shen, Y F; Liu, Wenning N; Sun, Xin; Khaleel, Mohammad A

TWinning Induced Plasticity (TWIP) steel is a typical representative of the 2nd generation of advanced high strength steel (AHSS) which exhibits a combination of high strength and excellent ductility due to the twinning mechanisms. This paper discusses the principal features of deformation twinning in faced-centered cubic austenitic steels and shows how a physiscally-based macroscopic model can be derived from microscopic considerations. In fact, a dislocation-based phenomenological model, with internal state variables such as dislocation density and micro-twins volume fraction representing the microstructure evolution during deformation process, is proposed to describe the deformation behavior of TWIP steels. The contribution of this work is the incorporation of a physically-based twin’s nucleation and volume fraction evolution model in a conventional dislocation-based approach. Microstructural level investigations, using scanning electron microscope (SEM) and transmission electron microscope (TEM) techniques, for the TWIP steel Fe–17.5 wt.% Mn–1.4 wt.% Al- 0.56 wt.% C, are used to validate and verify modeling assumptions. The model could be regarded as a semi-phenomenological approach with sufficient links between microstructure and overall properties and therefore offers good predictive capabilities. Its simplicity also allows a modular implementation in finite element-based metal forming simulations.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1005131
• Report Number(s): PNNL-SA-74208; 32712; VT0505000
• Journal Information: Materials Science and Engineering. A. Structural Materials: Properties, Microstructure and Processing, 528(3):1402-1408, Journal Name: Materials Science and Engineering. A. Structural Materials: Properties, Microstructure and Processing, 528(3):1402-1408 Journal Issue: 3 Vol. 528
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUSTENITIC STEELS
DEFORMATION
DISLOCATIONS
DUCTILITY
ELECTRON MICROSCOPES
Environmental Molecular Sciences Laboratory
IMPLEMENTATION
MICROSTRUCTURE
NUCLEATION
PLASTICITY
SIMULATION
STEELS
TWINNING