Direct observation of creep strengthening nanoprecipitate formation in ausformed ferritic/martensitic steels

SCRIPTA MATERIALIA

卷:164

Article

Vivas, J.¹  De-Castro, D.¹  Poplawsky, J. D.²  San-Martin, D.¹  Capdevila, C.¹ 

[1] CSIC, Materalia Res Grp, Dept Met Phys, CENIM, Avda Gregorio del Amo 8, Madrid 28040, Spain

[2] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA

关键词: MX nanoprecipitates;    Atom probe tomography;    Ausforming;    Creep resistant steels;    Creep strength;   

DOI  :  10.1016/j.scriptamat.2019.01.036

来源: Elsevier

【 摘 要 】

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). (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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