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Thermomechanical simulation in novel vanadium alloyed high strength interstitial free steels. / Kok Yong Beh

Swansea University Author: Kok Yong Beh

Abstract

The steel industry has been encouraged to develop high strength and good formability strip steels in order to address the needs of the automotive sector and address the competition from lightweight materials such as aluminium alloys. In order to meet these stringent requirements, high strength inter...

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Published: 2007
Institution: Swansea University
Degree level: Master of Philosophy
Degree name: M.Phil
URI: https://cronfa.swan.ac.uk/Record/cronfa42692
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spelling 2018-08-16T14:39:02.9105634 v2 42692 2018-08-02 Thermomechanical simulation in novel vanadium alloyed high strength interstitial free steels. 3806ecb5c0a3cd530ef6eceaf2d7fd3f NULL Kok Yong Beh Kok Yong Beh true true 2018-08-02 The steel industry has been encouraged to develop high strength and good formability strip steels in order to address the needs of the automotive sector and address the competition from lightweight materials such as aluminium alloys. In order to meet these stringent requirements, high strength interstitial free steels have been developed. High strength interstitial free steels are characterised by high elongation values, high r-value, low yield strength and tensile strength higher than the conventional interstitial free steel. This study has focussed on two different grades of experimental high strength interstitial free steels. The literature review provides the details of the processing route applied to obtain appropriate mechanical properties on high strength IF strip steels and the investigation of these properties for each microalloying element and also the various types of precipitates forming, including carbides, nitrides, carbonitrides and sulphides, which could be present in High Strength IF steels relevant to the present study. In recent years, thermomechanical processing of strip steels has become the preferred processing route to produce high quality strip steel products and satisfy the requirements of the automotive industry. Experimental simulation is one way of obtaining an optimum processing route for subsequent application during thermomechanical heat treatment. In this part of the study, two experimental grades of high strength IF steels were studied a titanium stabilised and a titanium-vanadium stabilised grade, which were subjected to thermomechanical simulation via the Gleeble 3500 machine. Following Gleeble testing, a microstructure examination has been performed, coupled with hardness testing, grain size evolution, as well as with MT-Data thermodynamic calculations of precipitate formation. This study identified the critical parameters for processing titanium and titanium- vanadium alloyed experimental HS-IF steels grades. These included, the identification of the effect the reheating, roughing, coiling and finishing temperatures. The recommendation of the optimised processing route is offered as part of this thesis. E-Thesis Materials science. 31 12 2007 2007-12-31 COLLEGE NANME Engineering COLLEGE CODE Swansea University Master of Philosophy M.Phil 2018-08-16T14:39:02.9105634 2018-08-02T16:24:30.1334020 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Kok Yong Beh NULL 1 0042692-02082018162514.pdf 10807461.pdf 2018-08-02T16:25:14.4530000 Output 14861002 application/pdf E-Thesis true 2018-08-02T16:25:14.4530000 false
title Thermomechanical simulation in novel vanadium alloyed high strength interstitial free steels.
spellingShingle Thermomechanical simulation in novel vanadium alloyed high strength interstitial free steels.
Kok Yong Beh
title_short Thermomechanical simulation in novel vanadium alloyed high strength interstitial free steels.
title_full Thermomechanical simulation in novel vanadium alloyed high strength interstitial free steels.
title_fullStr Thermomechanical simulation in novel vanadium alloyed high strength interstitial free steels.
title_full_unstemmed Thermomechanical simulation in novel vanadium alloyed high strength interstitial free steels.
title_sort Thermomechanical simulation in novel vanadium alloyed high strength interstitial free steels.
author_id_str_mv 3806ecb5c0a3cd530ef6eceaf2d7fd3f
author_id_fullname_str_mv 3806ecb5c0a3cd530ef6eceaf2d7fd3f_***_Kok Yong Beh
author Kok Yong Beh
author2 Kok Yong Beh
format E-Thesis
publishDate 2007
institution Swansea University
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 - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description The steel industry has been encouraged to develop high strength and good formability strip steels in order to address the needs of the automotive sector and address the competition from lightweight materials such as aluminium alloys. In order to meet these stringent requirements, high strength interstitial free steels have been developed. High strength interstitial free steels are characterised by high elongation values, high r-value, low yield strength and tensile strength higher than the conventional interstitial free steel. This study has focussed on two different grades of experimental high strength interstitial free steels. The literature review provides the details of the processing route applied to obtain appropriate mechanical properties on high strength IF strip steels and the investigation of these properties for each microalloying element and also the various types of precipitates forming, including carbides, nitrides, carbonitrides and sulphides, which could be present in High Strength IF steels relevant to the present study. In recent years, thermomechanical processing of strip steels has become the preferred processing route to produce high quality strip steel products and satisfy the requirements of the automotive industry. Experimental simulation is one way of obtaining an optimum processing route for subsequent application during thermomechanical heat treatment. In this part of the study, two experimental grades of high strength IF steels were studied a titanium stabilised and a titanium-vanadium stabilised grade, which were subjected to thermomechanical simulation via the Gleeble 3500 machine. Following Gleeble testing, a microstructure examination has been performed, coupled with hardness testing, grain size evolution, as well as with MT-Data thermodynamic calculations of precipitate formation. This study identified the critical parameters for processing titanium and titanium- vanadium alloyed experimental HS-IF steels grades. These included, the identification of the effect the reheating, roughing, coiling and finishing temperatures. The recommendation of the optimised processing route is offered as part of this thesis.
published_date 2007-12-31T03:53:28Z
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score 11.036116

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