TEM and MDS study of NPSS
EMSL Project ID
32712
Abstract
Nano-Precipitates Strengthening Steels (NPSS) are currently under consideration for use as various vehicle components in the automotive industry for their excellent combination of mechanical properties. Our study is inspired by the recent research progress, which indicate that, whereas the specific approaches to produce nano-precipitates are drastically different, they all have resulted in excellent combination of strength, ductility and press formability. This is a very critical observation for our study. First, it demonstrates the inherent advantages of nano-precipitate strengthening in steels that are not unique to, or rely on, a specific mechanism in forming nano-precipitate, provided that certain basic attributes of nano-precipitates (size, morphology, distribution, and precipitate/matrix interface characteristics) be met. Second, it indicates the possibility of forming â??desiredâ?? nano precipitates by other approaches. Last but not least, NPSS can be made in ferritic phase matrix, a very important fact related to the cost of NPSS. The ultimate goal of this study is to quantify the effects of size, shape and spacing/distribution of nano-precipitates on the deformation behavior of NPSS based on Transmission Electron Microscopy (TEM) study and subsequent mechanistic modeling and experiments in order to acquire a fundamental understanding of the nano-precipitate strengthening mechanisms.
Project Details
Project type
Exploratory Research
Start Date
2009-02-05
End Date
2010-02-07
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members
Related Publications
Characterization of Thermo-Mechanical Behaviors of Advanced High Strength Steels (AHSS). Final Report FY09.
Characterization of Thermo-Mechanical Behaviors of Advanced High- Strength Steels (AHSS): Formability, Weldability and Performance Evaluations of AHSS Parts for Automotive Structures (Project 18987/ Agreement 14687). Progress Report FY09.
Soulami A, KS Choi, YF Shen, WN Liu, X Sun, and MA Khaleel. 2011. "On deformation twinning in a 17.5%Mn-TWIP steel: A physically-based phenomenological model." Materials Science and Engineering. A. Structural Materials: Properties, Microstructure and Processing 528(3):1402-1408. doi:10.1016/j.msea.2010.10.031