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Segregation neutralised steels : microstructural banding elimination from dual phase steel through alloy design accounting for inherent segregation
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Slater, Carl, Bandi, Bharath, Dastur, Pedram and Davis, Claire (2022) Segregation neutralised steels : microstructural banding elimination from dual phase steel through alloy design accounting for inherent segregation. Metallurgical and Materials Transactions A, 53 (6). pp. 2286-2299. doi:10.1007/s11661-022-06674-6 ISSN 1543-1940.
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Official URL: https://doi.org/10.1007/s11661-022-06674-6
Abstract
Banding in commercial dual-phase steels, such as banded ferrite and pearlite or ferrite and martensite microstructures, is inherited from segregation during solidification in continuously cast material, predominantly from Mn segregation, and subsequent rolling. The banded microstructures lead to anisotropic mechanical properties which is generally undesirable. This paper presents an alloy design approach (termed “segregation neutralised” steels) to remove banding of the second phase by utilising co-segregation of both austenite and ferrite stabilisers to reduce local variability in second phase stability. The new composition proposed also considers achieving the same strength levels through maintaining the same second phase fraction, grain size and solid solution strengthening increments. Phase field modelling has been used to predict the segregation and phase transformation behaviours for a commercial composition dual-phase steel and the new composition segregation neutralised steel. A 5 kg laboratory alloy production route (casting, hot rolling and coiling simulation, cold rolling and annealing) has shown that the banded structure seen in commercial dual-phase steels is accurately reproduced and that banding has been reduced dramatically in both the hot rolled condition as well as after cold rolling and annealing in the new segregation neutralised steel. Chemical analysis has shown that in the segregation neutralised alloy the second phase distribution shows no correlation to the segregation bands, due to the achieved balance in austenite and ferrite stabilisers.
| Item Type: | Journal Article | ||||||||||||
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| Subjects: | T Technology > TN Mining engineering. Metallurgy | ||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||||||
| Library of Congress Subject Headings (LCSH): | Segregation (Metallurgy), Steel, High strength, Steel alloys -- Metallurgy | ||||||||||||
| Journal or Publication Title: | Metallurgical and Materials Transactions A | ||||||||||||
| Publisher: | Springer US | ||||||||||||
| ISSN: | 1543-1940 | ||||||||||||
| Official Date: | June 2022 | ||||||||||||
| Dates: |
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| Volume: | 53 | ||||||||||||
| Number: | 6 | ||||||||||||
| Page Range: | pp. 2286-2299 | ||||||||||||
| DOI: | 10.1007/s11661-022-06674-6 | ||||||||||||
| Status: | Peer Reviewed | ||||||||||||
| Publication Status: | Published | ||||||||||||
| Reuse Statement (publisher, data, author rights): | This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://dx.doi.org/[insert DOI] | ||||||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||
| Date of first compliant deposit: | 11 April 2022 | ||||||||||||
| Date of first compliant Open Access: | 14 April 2022 | ||||||||||||
| RIOXX Funder/Project Grant: |
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