Effect of Ti on the Microstructure and Mechanical Properties of a Hot Rolled Advanced High Strength Steel Strip

Ali Smith; Florian Vercruysse; Roumen Petrov; Patricia Verleysen; Bernd Linke

doi:10.4028/www.scientific.net/MSF.941.106

Paper Titles

Influence of Aluminium on Castability of V-Microalloyed Steels
p.83

Through-Scale Analysis of Strain Path Effects in Microalloyed Austenite Subjected to Reverse Rolling
p.89

Modelling of the Influence of Prior Deformation of Austenite on the Martensite Formation in a Low-Alloyed Carbon Steel
p.95

High Strength High Ductility Low Alloyed Steel
p.100

Effect of Ti on the Microstructure and Mechanical Properties of a Hot Rolled Advanced High Strength Steel Strip
p.106

Surface Defect Formation in Steel Continuous Casting
p.112

Microstructure, Texture, Mechanical and Corrosion Performance of the Stainless Duplex Steel UNS S32205 Submitted to Warm Rolling
p.118

Prediction of the Hydrogen-Induced Damage to Ultra-High Strength Steel Concepts
p.124

Nucleation Effect of Ca-Oxysulfide Inclusions of Low Carbon Steel in Heat Affected Zone by Welding
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HomeMaterials Science ForumMaterials Science Forum Vol. 941Effect of Ti on the Microstructure and Mechanical...

Effect of Ti on the Microstructure and Mechanical Properties of a Hot Rolled Advanced High Strength Steel Strip

Abstract:

The addition of titanium is a well-known microalloying concept for hot rolled structural steels. Concerning advanced high strength steels for the automotive sector, the use of Ti microalloying (usually with Nb-V) has been an active research area. However, Ti addition has not been explored in depth. For the current contribution, a laboratory hot rolled 0.2C-2.4Mn-1.5Si steel with and without Ti addition was studied. Mechanical testing of the hot strip revealed a very high UTS (1GPa) for the Ti added steel, whilst for the unalloyed chemistry the UTS was some 300 MPa lower. Observation of the hot rolled microstructures via optical microscopy showed a significantly higher hardenability for the Ti added steel. Moreover, X-ray diffraction analysis indicated a significant amount of retained austenite in the Ti added strip, which transformed completely to martensite after the tensile test. Further analysis via TEM and chemical extraction indicated that Ti was present both as Ti (C,N) precipitates and in solution. Finally, in light of these observations, the possible mechanisms leading to the enhanced hardenability observed for the Ti added hot rolled strip steel were discussed.

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Periodical:

Materials Science Forum (Volume 941)

Pages:

106-111

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.941.106

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Online since:

December 2018

Authors:

Ali Smith, Florian Vercruysse, Roumen Petrov, Patricia Verleysen, Bernd Linke

Keywords:

Advanced High Strength Steel, Hardenability, Hot Rolling, Titanium, TRIP

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