Abstract
It is well known the effectiveness of ausforming on increasing the dislocation density of fresh martensite. This work demonstrates, using atom probe tomography, that this increase in the dislocation density has a strong influence on the nucleation of nanoprecipitates during tempering. Therefore, ausforming might be a powerful processing route for the two-fold improvement of ferritic/martensitic steels where creep resistance is of paramount importance. Firstly, ausforming refines the martensitic microstructure (high strength and toughness), and secondly, it increases the number density of thermally stable nanoprecipitates (creep resistance).
| Original language | English |
|---|---|
| Pages (from-to) | 76-81 |
| Number of pages | 6 |
| Journal | Scripta Materialia |
| Volume | 164 |
| DOIs | |
| State | Published - Apr 15 2019 |
Bibliographical note
Publisher Copyright:© 2019 Acta Materialia Inc
Funding
This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). Authors acknowledge financial support to Spanish Ministerio de Economía y Competitividad (MINECO) in the form of a Coordinate Project ( MAT2016-80875-C3-1-R ). APT has been conducted at ORNL's Center for Nanophase Materials Sciences (CNMS), which is a U.S. DOE Office of Science User Facility. The authors are grateful to Mr. Miguel Angel Acedo for the dilatometer tests undertaken at the Phase Transformation laboratory of CENIM. J. Vivas acknowledges financial support in the form of a FPI Grant BES-2014-069863 . This work contributes to the Joint Programme on Nuclear Materials (JPNM) of the European Energy Research Alliance (EERA).
| Funders | Funder number |
|---|---|
| U.S. Department of Energy | |
| Family Process Institute | BES-2014-069863 |
| Ministerio de Economía y Competitividad | MAT2016-80875-C3-1-R |
Keywords
- Atom probe tomography
- Ausforming
- Creep resistant steels
- Creep strength
- MX nanoprecipitates