Stabilized uniform deformation in a high-strength ferrite-cementite steel with multiscale lamellar structure
| Autor: | Yun-li Feng, Ya-tong Zhang, Lu Huang, Jiang-li Ning |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Carbon steel 02 engineering and technology engineering.material 01 natural sciences Instability chemistry.chemical_compound Ferrite (iron) 0103 physical sciences Ultimate tensile strength lcsh:TA401-492 General Materials Science Lamellar structure Composite material 010302 applied physics Cementite Mechanical Engineering Metallurgy 021001 nanoscience & nanotechnology Microstructure chemistry Mechanics of Materials engineering lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology Science technology and society |
| Zdroj: | Materials & Design, Vol 120, Iss, Pp 280-290 (2017) |
| ISSN: | 0264-1275 |
| Popis: | In order to ameliorate the ductility and stabilize the uniform deformation of ultrafine-grained (UFG) ferrite-cementite steel while retaining its high strength, a multiscale lamellar structure was developed and compared with the UFG structure. Microstructures were characterized and tensile behaviors were analyzed in the samples with multiscale lamellar and UFG structures; the mechanisms underlying the different strain-hardening capabilities were studied. Plastic instability dominated during the tensile deformation of spheroidized UFG carbon steel, because of its low strain-hardening owing to the uniform UFG structure with high dislocation density. However, the steel with multiscale lamellar structure exhibited a marked improvement in the balance between strength and uniform deformation, ascribing to the enhanced strain-hardening capability. This result was primarily attributed to the extra strain-hardening generated by the strain gradient and stress state change caused by the multiscale lamellar structure. Keywords: Plain carbon steel, High strength, Uniform deformation, Multiscale structure, Lamellar structure |
| Databáze: | OpenAIRE |
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