Interplay between metastable phases controls strength and ductility in steels

Hidalgo Garcia, J.; Huizenga, R.M.; Findley, K.O.; Santofimia, Maria Jesus

doi:10.1016/j.msea.2018.12.096

Interplay between metastable phases controls strength and ductility in steels

Title

Interplay between metastable phases controls strength and ductility in steels

Author

Hidalgo Garcia, J. (TU Delft (OLD) MSE-3)
Huizenga, R.M. (TU Delft (OLD) MSE-1)
Findley, K.O. (Colorado School of Mines)
Santofimia, Maria Jesus (TU Delft (OLD) MSE-3)

Date

2019

Abstract

By means of high-energy synchrotron X-ray diffraction, the interplay between martensite and retained austenite phases in steel during the application of stress has been analyzed. Martensite properties were varied through controlled reheating heat treatments in a low carbon Quenched and Partitioned (Q&P) steel consisting of retained austenite and martensite. The reheating treatments significantly altered martensite strength while keeping the same fractions of retained austenite as the non-reheated Q&P microstructures, resulting in different degrees of stress partitioning and work hardening of the individual microconstituents. Results of this study show that the strength ratio between the different phases in the microstructure plays a crucial role in the onset and rate of mechanically induced decomposition of retained austenite. Consequently, the strength ratio between phases controls the yielding and work-hardening of the material.

Subject

Austenite stability
Martensite strength
Multiphase steels
Synchrotron XRD
Work-hardening

To reference this document use:

http://resolver.tudelft.nl/uuid:fe3cf9bc-efc4-4323-9b65-cd9546fb09a6

DOI

https://doi.org/10.1016/j.msea.2018.12.096

ISSN

0921-5093

Source

Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing, 745, 185-194

Part of collection

Institutional Repository