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Effect of alloy treatment and coiling temperature on microstructure and bending performance of ultra-high strength strip steel
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Mandal, Abhisek, Karmakar, Anish, Chakrabarti, Debalay and Davis, Claire (2018) Effect of alloy treatment and coiling temperature on microstructure and bending performance of ultra-high strength strip steel. Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science . doi:10.1007/s11661-018-4946-z
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WRAP-alloy-treatment-coiling-temperature-microstructure-bending-strip-steel-Davis-2018.pdf - Accepted Version - Requires a PDF viewer. Download (3713Kb) | Preview |
Official URL: https://doi.org/10.1007/s11661-018-4946-z
Abstract
Two different high strength B-containing microalloyed steel strips produced in industrial processing conditions, one treated with Ti and the other treated with Al, processed by controlled rolling, accelerated cooling and coiling in two different temperatures ranges [723 K to 733 K (450 °C to 460 °C)] and [633 K to 653 K (360 °C to 380 °C)] were subjected to bend testing. The Ti treated steel coiled at the higher temperature 733 K (460 °C) showed the best bending performance. The relatively softer (tensile strength of < 900 MPa) and homogeneous microstructure containing mostly granular bainite and upper bainite to ~300-400 μm depth below the surface, generated at the higher coiling temperature, is preferred for bendability. The lower temperature coiling resulted in the formation of a hard surface layer dominated by martensite which is undesired as the steel becomes prone to shear cracking and interphase separation due to strain-localization. The combined effect of beneficial texture components such as γ-fiber, {332} <113> and even {112} <131> in the sub-surface region as well as uniformity of through thickness texture of the rolled sheet improve the bendability. In the presence of crack initiators, like coarse and brittle TiN particles found in the Ti treated steel, a harder microstructure and the presence of Cube and Goss texture in the sub-surface layer, seen for the lower coiling temperature can cause local transgranular cleavage cracking. Finally the post-uniform elongation obtained from tensile testing and bendability follow a good correlation.
| Item Type: | Journal Article | ||||||
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| Subjects: | T Technology > TN Mining engineering. Metallurgy | ||||||
| Divisions: | Faculty of Science > WMG (Formerly the Warwick Manufacturing Group) | ||||||
| Library of Congress Subject Headings (LCSH): | Steel, High strength -- Thermomechanical properties, Bainite, Martensite | ||||||
| Journal or Publication Title: | Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science | ||||||
| Publisher: | Springer US | ||||||
| ISSN: | 1073-5623 | ||||||
| Official Date: | 15 October 2018 | ||||||
| Dates: |
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| Date of first compliant deposit: | 22 October 2018 | ||||||
| DOI: | 10.1007/s11661-018-4946-z | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Publisher Statement: | This is a post-peer-review, pre-copyedit version of an article published in Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science. The final authenticated version is available online at: https://doi.org/10.1007/s11661-018-4946-z. | ||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||
| RIOXX Funder/Project Grant: |
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