Microstructure and properties of a low-carbon steel processed by equal-channel angular pressing

Wang, Jing Tao, Xu, Cheng, Du, Zhong Ze, Qu, Guo Zhong and Langdon, Terence G. (2005) Microstructure and properties of a low-carbon steel processed by equal-channel angular pressing. Materials Science and Engineering: A, 410-411, 312-315. (doi:10.1016/j.msea.2005.08.111).

Abstract

An ultrafine-grained low carbon steel (Fe–0.15 wt.% C–0.52 wt.% Mn) was fabricated by equal channel angular pressing (ECAP) at room temperature by pressing for up to a maximum of 10 passes using route C. There was an elongated substructure with a width of ~0.2–0.3 ?m after 10 passes of ECAP and the corresponding tensile strength was >1200 MPa. It is shown that subsequent annealing for 1 h at 773 K, which is below the recrystallization temperature of ferrite, leads to equiaxed grains with a size of ~0.3–0.4 ?m, an increase in the tensile elongation and a strength above 1000 MPa. Annealing for 1 h at 873 K, which is above the recrystallization temperature, gives a recrystallized equiaxed structure of fine grains with an average grain size of ~7 ?m, a strength of <500 MPa and stress–strain curves similar to those anticipated for a low-carbon steel.

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Contributors

Author: Terence G. Langdon

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