| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Austenite Formation and Decomposition V: A Symposium in Memory of Prof. Mats Hillert
|
| Presentation Title |
Chemically Patterned Steels |
| Author(s) |
Xiaohan Weng, Yuxiang Wu, Christopher R. Hutchinson |
| On-Site Speaker (Planned) |
Christopher R. Hutchinson |
| Abstract Scope |
In this contribution, we report our recent efforts using a new processing route for controlling both the stability and spatial distribution of metastable austenite in a ferritic/martensitic matrix in medium Mn steels. It exploits a fine scale (~100 nm) chemical patterning of Mn in austenite that may be obtained by the re-austenitisation of a pearlite structure formed under conditions with strong Mn partitioning between ferrite and cementite. The alloy compositions can be designed to obtain controlled volume fractions of metastable austenite and examples with 20%, 30% and 50% retained austenite will be shown. The resulting ‘ghost pearlite’ (ferrite/metastable austenite) can exhibit interesting combinations of ultimate tensile strength (UTS) and ductility. The simple steel compositions and short processing provides a UTS-ductility combination similar to maraging steels and super bainitic steels. Such structures have very interesting wear properties and could be pursued as new abrasion-resistant materials. |