Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 103, Issue -, Pages 39-66Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2017.12.008
Keywords
Phase transformation; Thermomechanical modeling; Forming limit diagram; MK analysis; TRIP steel
Funding
- Natural Sciences and Engineering Research Council - Automotive Partnership Collaboration (NSERC-APC) [APCJ 441668-12]
- Natural Sciences and Engineering Research Council - Industrial Research Chair (NSERC-IRC) [IRCPJ-503185-2016]
- General Motors of Canada
- Natural Sciences and Engineering Research Council - Undergraduate Student Research Award
- Ontario Graduate Scholarship
Ask authors/readers for more resources
Transformation induced plasticity (TRIP) steels have significant volume fractions of retained austenite that can undergo a strain induced transformation into martensite. This transformation, known as the TRIP effect, produces a high hardening capacity that can lead to enhanced formability, which can result in weight reduction and improved vehicle fuel efficiency for automakers. In this paper, a phenomenological framework for TRIP steel is integrated into a Marciniak-Kuczynski (MK) model coupled with a thermal solver to create a new fully coupled thermomechanical formulation to evaluate formability. The constitutive model was calibrated to capture the kinematics of martensite and flow stress dependence on strain rate, temperature, triaxiality, and stress asymmetry for TRIP 800 steel. Several sensitivity and exploratory studies are performed to highlight critical mechanisms for modeling TRIP in formability. Kinematic effects of transformation are shown to have a minor effect on formability compared to the hardening and evolving yield surface effects. Thermal effects, such as conduction, convection, and radiation heat transfer, are shown to be crucial for the formability of TRIP 800 at elevated sheet temperatures with room temperature external boundaries, but not for elevated external boundaries. By modifying the sheet initial thermal conditions, martensite transformation could be controlled to be able to delay localization and enhance formability in the plane strain and uniaxial formability by 25% and 35% respectively.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available