Influence of Various Material Design Parameters on Deformation Behaviors of TRIP Steels

Journal Article · Tue Nov 02 04:00:00 EDT 2010 · Computational Materials Science, 50(2):720-730

DOI:https://doi.org/10.1016/j.commatsci.2010.10.002· OSTI ID:1222175

Choi, Kyoo Sil; Soulami, Ayoub; Liu, Wenning N.; Sun, Xin; Khaleel, Mohammad A.

In this paper, the microstructure-based finite element modeling method is used as a virtual design tool in investigating the respective influence of various material design parameters on the deformation behaviors of transformation induced plasticity (TRIP) steels. For this purpose, the separate effects of several different material design parameters, such as the volume fraction and stability of austenite phase and the strengths of the constituent phases, on the ultimate tensile strength (UTS) and ductility/formability of TRIP steels are quantitatively examined using different representative volume elements (RVEs) representing different TRIP steels. The computational results suggest that higher austenite stability is helpful in enhancing the ductility and formability of TRIP steels by delaying the martensitic transformation to a later stage, whereas increase of austenite volume fraction and/or ferrite strength alone is not beneficial to improve the performance of TRIP steels. The results in this study also indicate that various material design parameters must be adjusted concurrently to develop high performance TRIP steels. For example, the austenite strength should increase over the ferrite strength in order to induce the gradual/smooth martensitic transformation, and the strength disparity between the ferrite and the freshly-formed martensite phases should decrease in order to avoid higher stress/strain concentration along the phase boundaries. The modeling approach and results presented in this paper can be helpful in providing the deformation fundamentals for the development of high performance TRIP steels.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1222175
• Report Number(s): PNNL-SA-72448; VT0505000
• Journal Information: Computational Materials Science, 50(2):720-730, Journal Name: Computational Materials Science, 50(2):720-730
• Country of Publication: United States
• Language: English

Related Subjects

Austenite stability
Austenite volume fraction
Finite element analysis
Material design parameters
Microstructure
TRIP steels