Structural Ultrafine Grained Steels Obtained by Advanced Controlled Rolling

• Published in: Journal of iron and steel research, international Vol. 20; no. 1; pp. 62 - 70
• Main Authors: González, R., García, J. O., Barbés, M. A., Quintana, M. J., Verdeja, L. F., Verdeja, J. I.
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 2013; Springer Singapore
• Subjects: Applied and Technical Physics; Automotive engineering; Controlled rolling; Engineering; Ferrite; Grain size; Iron and steel industry; Machines; manufacturability; Manufacturing; Materials Engineering; Materials Science; mechanical property; Metallic Materials; Physical Chemistry; Processes; Steel making; Strain hardening; Structural steels; ultrafine grained steel; 控制轧制; 断裂韧性; 晶粒尺寸; 结构; 超细晶粒钢; 超细铁素体; 超细颗粒; 轧制生产; mechanical property; strain-hardening; ultrafine grained steel; manufacturability
• ISSN: 1006-706X; 2210-3988
• DOI: 10.1016/S1006-706X(13)60046-1

Steels with ultrafine grains （lower than 5 μm）, which usually known as ultrafine ferrite or ultrafine grained materials, are presently the object of intense research, because of the improvement in resistance and fracture toughness they may reach compared to conventional steels （with grain sizes above this value）. It is shown that the forenamed steels designated in the Euronorm EN 10149-2, which are manufactured by advanced techniques of controlled rolling and mainly used in automotive industry, have an ultrafine grain size in the range of 2.5 to 3.5 μm, and with elastic yield stresses higher than 400 MPa. Based on the Morrison-Miller criterion, it is shown that values of the strain-hardening coefficient lower than 0.08 would make the industrial application of these steels unfeasible.