Influence of Nb stabilization on the recovery and recrystallization kinetics of a ferritic stainless steel with soft magnetic properties for automotive applications

Rem: Revista Escola de Minas

Nicolas Meyer²  Marc Mantel¹  P.e. Dubois¹  Muriel Veron¹  Yves Brechet¹  Olivier Geoffroy¹ 

[1] ,UGITECH, Schmolz + Bickenbach groupUgine,France

关键词: Ferritic stainless steel;    recrystallysation;    magnetic properties;    niobium stabilization;    Aço inoxidável ferrítico;    recristalização;    propriedades magnéticas;    estabilização pelo nióbio;   

DOI  :  10.1590/S0370-44672013000200004

来源: SciELO

【 摘 要 】

Usually niobium is added in ferritic stainless steels to avoid chromium carbides precipitation and then to improve corrosion resistance and to avoid embrittlemet. This study shows that a low Nb stabilization makes recrystallization nucleation much faster and prevents incomplete recrystallization. A qualitative interpretation, based on interaction with precipitates, is proposed and explains the main features of the softening kinetics as well as the microstructures obtained. Above a specific magnetizing frequency, the deformed state led to smaller losses than the recrystallized state. These results are believed to be attributed to a grain size effect. This leads to soft magnetic properties that makes 17%CrNb ferritic stainless steels a very interesting solution for the market of electromagnetic injection. Improving response-time of fuel injection valves is a great challenge for automotive industry in order to enhance car engine efficiency and to limit noxious gas emission.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License