Recovery of Ductility in Ultrafine-Grained Low-Carbon Steel Processed Through Equal-Channel Angular Pressing Followed by Cold Rolling and Flash Annealing

The low-carbon steel workpieces are deformed by equal-channel angular pressing at 293 K (20 °C) up to an equivalent strain of ~12 using route B c , which results in the bulk ultrafine-grained (UFG) structure with high dislocation density and partial dissolution of cementite. The yield strength (YS)...

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Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2017-03, Vol.48 (3), p.1189-1203
Main Authors: Singh, Raj Bahadur, Mukhopadhyay, N. K., Sastry, G. V. S., Manna, R.
Format: Article
Language:English
Subjects:
Annealing
Cementite
Characterization and Evaluation of Materials
Chemistry and Materials Science
Cold rolling
Ductility
Equal channel angular pressing
Ferrite
Grains
Low carbon steel
Materials Science
Metallic Materials
Metallurgy
Nanotechnology
Steel alloys
Structural Materials
Surfaces and Interfaces
Texture
Thin Films
Yield strength
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description The low-carbon steel workpieces are deformed by equal-channel angular pressing at 293 K (20 °C) up to an equivalent strain of ~12 using route B c , which results in the bulk ultrafine-grained (UFG) structure with high dislocation density and partial dissolution of cementite. The yield strength (YS) is enhanced from 208 (as-received) to 872 MPa and the tensile strength is increased from 362 to 996 MPa, but the material loses total elongation (TE) from 36.2 to 2.9 pct. Cold rolling of equal-channel angular pressed steel produces the refined structure of grain size 0.11  μ m. The YS increases further to 924 MPa with a marginal gain in ductility due to the reappearance of the γ fiber component. Flash annealing the samples, which were equal-channel angular pressed followed by cold rolling, at 873 K (600 °C) results in 27 pct of micron-sized (9  µ m) ferrite grains in submicron-sized (
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A, Physical metallurgy and materials science</jtitle><stitle>Metall Mater Trans A</stitle><date>2017-03-01</date><risdate>2017</risdate><volume>48</volume><issue>3</issue><spage>1189</spage><epage>1203</epage><pages>1189-1203</pages><issn>1073-5623</issn><eissn>1543-1940</eissn><coden>MMTAEB</coden><abstract>The low-carbon steel workpieces are deformed by equal-channel angular pressing at 293 K (20 °C) up to an equivalent strain of ~12 using route B c , which results in the bulk ultrafine-grained (UFG) structure with high dislocation density and partial dissolution of cementite. The yield strength (YS) is enhanced from 208 (as-received) to 872 MPa and the tensile strength is increased from 362 to 996 MPa, but the material loses total elongation (TE) from 36.2 to 2.9 pct. Cold rolling of equal-channel angular pressed steel produces the refined structure of grain size 0.11  μ m. The YS increases further to 924 MPa with a marginal gain in ductility due to the reappearance of the γ fiber component. Flash annealing the samples, which were equal-channel angular pressed followed by cold rolling, at 873 K (600 °C) results in 27 pct of micron-sized (9  µ m) ferrite grains in submicron-sized (&lt;1  µ m) matrix with a reduced defect density and small amount of precipitation of cementite. TE increases from 2.9 to 23.3 pct. The material retains a YS of 484 MPa and tensile strength of 517 MPa, which are higher than those of the as-received material. The UFG grains are failed by cleavage, but the micron-sized grains display ductile fracture. The ductility of the flash-annealed material is recovered significantly due to bimodal grain size distribution in ferrite and the development of a good amount of γ fiber texture components. 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subjects Annealing
Cementite
Characterization and Evaluation of Materials
Chemistry and Materials Science
Cold rolling
Ductility
Equal channel angular pressing
Ferrite
Grains
Low carbon steel
Materials Science
Metallic Materials
Metallurgy
Nanotechnology
Steel alloys
Structural Materials
Surfaces and Interfaces
Texture
Thin Films
Yield strength
title Recovery of Ductility in Ultrafine-Grained Low-Carbon Steel Processed Through Equal-Channel Angular Pressing Followed by Cold Rolling and Flash Annealing
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