Enhanced true stress–true strain relationships due to grain refinement of a low-carbon ferrite–pearlite steel

• Published in: Materials letters Vol. 160; pp. 117 - 119
• Main Authors: Tsuchida, N., Inoue, T., Nakano, H., Okamoto, T.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2015
• Subjects: Ferrite; Filled plastics; Grain size; Low-carbon steel; Microstructure; Pearlite; Plastic deformation; Steels; Strain; True strain; True stress; Grain size; Low-carbon steel; True strain; True stress
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2015.07.093

The fine-grained low-carbon ferrite–pearlite (FP) steel with the ferrite grain size of 3.6μm showed enhanced true stress (σ)–true strain (ε) relationships up to fracture, i.e., the plastic deformation limit. Both σ and ε increased with decreasing ferrite grain size in the FP steels. The effect of ferrite grain size on the σ–ε relationships up to the plastic deformation limit was dependent on the microstructure, in spite of belonging to the same low-carbon steel. In the FP steels, the smaller the pearlite size became with decreasing ferrite grain size, the more the pearlite could deform. The decrease in not only the ferrite grain size but also the secondary microstructure is effective in improving the σ–ε relationship up to the plastic deformation limit. •Tensile deformation behavior of a low carbon ferrite–pearlite steel is discussed.•True stress-true strain relationships up to fracture were estimated.•fine-grained ferrite–pearlite steel showed enhanced true stress and true strain.•Both true stress and true strain increased with decreasing ferrite grain size.