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Effect of coiling temperature on impact toughness of hot rolled ultra-high-strength multiphase steel strips

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Mandal, Abhisek, Ghosh, Abhijit, Chakrabarti, Debalay and Davis, Claire (2021) Effect of coiling temperature on impact toughness of hot rolled ultra-high-strength multiphase steel strips. Materials Science and Engineering: A . 141796. doi:10.1016/j.msea.2021.141796

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Official URL: https://doi.org/10.1016/j.msea.2021.141796

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Abstract

The tensile and Charpy impact properties of four strip samples from two different B-added low-C ultra-high-strength steel strips (Al-treated and Ti-treated), coiled at two different temperature ranges (360–380 °C and 450–460 °C), have been evaluated and correlated to the microstructural parameters, dislocation density, and the intensity of high-angle boundaries. The effects of coiling temperatures on the microstructural evolution and mechanical properties have been discussed. The volume fraction of the individual phase constituents (namely, granular bainite, upper bainite, lower bainite and tempered martensite) and their hardness, local deformation response and the strain-hardening ability, as determined from nanoindentation testing, influenced the bulk properties such as hardness, tensile properties (strength and ductility), Charpy impact properties (upper shelf energy, USE, and ductile-to-brittle transition temperature, DBTT) and strain-hardening abilities under both quasi-static and dynamic loading conditions. The dominance of granular bainite and upper bainite (75–90 %) reduced the strength (670–722 MPa yield strength), improved ductility (16.7–19.5 % elongation to failure) and USE (35–42 J) in the samples coiled at the higher temperatures. In contrast, a higher fraction of tempered martensite and lower bainite (78–82 %) significantly increased the strength (808–814 MPa), reduced ductility (13.0–14.5 %) and USE (19–29 J) in the lower temperature coiled samples. The DBTT showed a complex trend with the microstructural parameters. It depended on the USE level, as well as on the ‘effective grain size’ of the matrix.

Item Type: Journal Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TN Mining engineering. Metallurgy
Divisions: Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Metals -- Impact testing, Steel, High strength -- Thermomechanical properties, Metals -- Microstructure, Strain hardening
Journal or Publication Title: Materials Science and Engineering: A
Publisher: Elsevier S.A.
ISSN: 0921-5093
Official Date: 2021
Dates:
DateEvent
2021Published
24 July 2021Available
22 July 2021Accepted
Article Number: 141796
DOI: 10.1016/j.msea.2021.141796
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

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