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Ultra High Strength Steels for Roll Formed Automotive Body in White / DANE HARDWICKE

Swansea University Author: DANE HARDWICKE

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DOI (Published version): 10.23889/SUthesis.63671

Abstract

One of the more recent steel developments is the quenching and partitioning process, first proposed by Speer et al. in 2003 on developing 3rd generation advanced high-strength steel (AHSS). The quenching and partitioning (Q&P) process set a new way of producing martensitic steels with enhanced a...

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Published: Swansea, Wales, UK 2023
Institution: Swansea University
Degree level: Doctoral
Degree name: EngD
Supervisor: Sackett, Elizabeth.
URI: https://cronfa.swan.ac.uk/Record/cronfa63671
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spelling v2 63671 2023-06-20 Ultra High Strength Steels for Roll Formed Automotive Body in White 09b0b95d7c028de3a83e836041a852c3 DANE HARDWICKE DANE HARDWICKE true false 2023-06-20 One of the more recent steel developments is the quenching and partitioning process, first proposed by Speer et al. in 2003 on developing 3rd generation advanced high-strength steel (AHSS). The quenching and partitioning (Q&P) process set a new way of producing martensitic steels with enhanced austenite levels, realised through controlled thermal treatments. The main objective of the so-called 3rd generation steels was to realise comparable properties to the 2nd generation but without high alloying additions. Generally, Q&P steels have remained within lab-scale environments, with only a small number of Q&P steels produced industrially. Q&P steels are produced either by a one-step or two-step process, and the re-heating mechanism for the two-step adds additional complexities when heat treating the material industrially. The Q&P steels developed and tested throughout this thesis have been designed to achieve the desired microstructural evolution whilst fitting in with Tata’s continuous annealing processing line (CAPL) capabilities. The CALPHAD approach using a combination of thermodynamics, kinetics, and phase transformation theory with software packages ThermoCalc and JMatPro has been successfully deployed to find novel Q&P steels. The research undertaken throughout this thesis has led to two novel Q&P steels, which can be produced on CAPL without making any infrastructure changes to the line. The two novel Q&P steels show an apparent reduction in hardness mismatch, illustrated visually and numerically after nano-indentation experiments. The properties realised after Q&P heat treatments on the C-Mn-Si alloy with 0.2 Wt.% C and the C-Mn-Si alloy with the small Cr addition is superior to the commercially available QP980/1180 steels by BaoSteel. Both novel alloys had comparable levels of elongation and hole expansion ratio to QP1180 but are substantially stronger with a > 320MPa increase in tensile stress. The heat treatment is also less complex as there is no requirement to heat the steel back up after quenching due to one-step quenching and partitioning being employed on the novel alloys. E-Thesis Swansea, Wales, UK Steel Metallurgy 8 6 2023 2023-06-08 10.23889/SUthesis.63671 COLLEGE NANME COLLEGE CODE Swansea University Sackett, Elizabeth. Doctoral EngD Tata Steel UK, WEFO, EPSRC and M2A 2023-10-03T16:01:39.8077639 2023-06-20T11:29:37.3952839 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering DANE HARDWICKE 1 63671__27885__dbd12cb326834333a31e6f5fb7917466.pdf 2023_Hardwicke_DW.final.63671.pdf 2023-06-20T11:34:09.0771925 Output 10908847 application/pdf E-Thesis – open access true Copyright: The Author, Dane W. Hardwicke, 2023. true eng
title Ultra High Strength Steels for Roll Formed Automotive Body in White
spellingShingle Ultra High Strength Steels for Roll Formed Automotive Body in White
DANE HARDWICKE
title_short Ultra High Strength Steels for Roll Formed Automotive Body in White
title_full Ultra High Strength Steels for Roll Formed Automotive Body in White
title_fullStr Ultra High Strength Steels for Roll Formed Automotive Body in White
title_full_unstemmed Ultra High Strength Steels for Roll Formed Automotive Body in White
title_sort Ultra High Strength Steels for Roll Formed Automotive Body in White
author_id_str_mv 09b0b95d7c028de3a83e836041a852c3
author_id_fullname_str_mv 09b0b95d7c028de3a83e836041a852c3_***_DANE HARDWICKE
author DANE HARDWICKE
author2 DANE HARDWICKE
format E-Thesis
publishDate 2023
institution Swansea University
doi_str_mv 10.23889/SUthesis.63671
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
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description One of the more recent steel developments is the quenching and partitioning process, first proposed by Speer et al. in 2003 on developing 3rd generation advanced high-strength steel (AHSS). The quenching and partitioning (Q&P) process set a new way of producing martensitic steels with enhanced austenite levels, realised through controlled thermal treatments. The main objective of the so-called 3rd generation steels was to realise comparable properties to the 2nd generation but without high alloying additions. Generally, Q&P steels have remained within lab-scale environments, with only a small number of Q&P steels produced industrially. Q&P steels are produced either by a one-step or two-step process, and the re-heating mechanism for the two-step adds additional complexities when heat treating the material industrially. The Q&P steels developed and tested throughout this thesis have been designed to achieve the desired microstructural evolution whilst fitting in with Tata’s continuous annealing processing line (CAPL) capabilities. The CALPHAD approach using a combination of thermodynamics, kinetics, and phase transformation theory with software packages ThermoCalc and JMatPro has been successfully deployed to find novel Q&P steels. The research undertaken throughout this thesis has led to two novel Q&P steels, which can be produced on CAPL without making any infrastructure changes to the line. The two novel Q&P steels show an apparent reduction in hardness mismatch, illustrated visually and numerically after nano-indentation experiments. The properties realised after Q&P heat treatments on the C-Mn-Si alloy with 0.2 Wt.% C and the C-Mn-Si alloy with the small Cr addition is superior to the commercially available QP980/1180 steels by BaoSteel. Both novel alloys had comparable levels of elongation and hole expansion ratio to QP1180 but are substantially stronger with a > 320MPa increase in tensile stress. The heat treatment is also less complex as there is no requirement to heat the steel back up after quenching due to one-step quenching and partitioning being employed on the novel alloys.
published_date 2023-06-08T16:01:41Z
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score 11.012678

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