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Thermomechanical simulation in novel vanadium alloyed high strength interstitial free steels. / Kok Yong Beh
Swansea University Author: Kok Yong Beh
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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...
| Published: |
2007
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| Institution: | Swansea University |
| Degree level: | Master of Philosophy |
| Degree name: | M.Phil |
| URI: | https://cronfa.swan.ac.uk/Record/cronfa42692 |
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| 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 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. |
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| Keywords: |
Materials science. |
| College: |
Faculty of Science and Engineering |