Evolution of Microstructure and Mechanical Properties of HSLA Strip Steel after Cold Rolling and Annealing

Abstract:

Article Preview

A large testing programme of a strip steel HSLA grade, microalloyed by vanadium, titanium and niobium, was conducted. The experiment was based on combination of cold rolling, recrystallization annealing, mechanical testing, metallographic examinations and TEM analysis. Flat samples with thickness 3.9 mm were rolled in several passes with the total height reduction 5 to 75 %. Afterwards the laboratory mill products were annealed in the vacuum furnace with the protective gas atmosphere consisting of N2+H2. The annealed samples underwent the mechanical testing. The gained results – hardness, yield stress, tensile strength and their ratio, as well as elongation, were summarized in graph in dependence on relative height reduction before annealing. It was confirmed that by a suitable combination of size of previous cold deformation and parameters of the following recrystallization annealing it is possible to influence a complex of mechanical properties of particular strips. Particular trends of strength and plastic properties correspond to each other and they may be utilized for optimization of terms of heat treatment of the investigated HSLA steel in a cold rolling mill. These trends are caused by structure-forming processes (recrystallization, grain coarsening, changes of the state of precipitates) which were documented by micrographs.

Info:

Periodical:

Materials Science Forum (Volumes 567-568)

Edited by:

Pavel Šandera

Pages:

345-348

Citation:

M. Janošec et al., "Evolution of Microstructure and Mechanical Properties of HSLA Strip Steel after Cold Rolling and Annealing", Materials Science Forum, Vols. 567-568, pp. 345-348, 2008

Online since:

December 2007

Export:

Price:

$38.00

[1] KOLLEROVÁ, M., ŽÍDEK, M., POČTA, B., DĚDEK, V.: Valcovanie. Bratislava: ALFA, (1991).

[2] DĚDEK, V.: Tepelné zpracování ocelových pásů válcovaných za studena. Praha: SNTL, (1964).

[3] PRASAT, N., KUMAR, S., KUMAR, P., OJHA, S. N.: Mechanical properties of cold-rolled annealed HSLA steel. Journal of Material Science, 26, 1991, No. 19, pp.5158-5162.

DOI: https://doi.org/10.1007/bf01143207

[4] Information on http: /www. fmmi. vsb. cz/model.

[5] Deformation Behaviour and Properties of Selected Metallic Materials. Edited by Ivo SCHINDLER & Eugeniusz HADASIK. Publishers of The Silesian University of Technology Gliwice 2007. In press. This work was realized in the framework of Research Plan MSM6198910015 (Ministry of Education of the Czech Republic) and Project FT-TA2/091 (Ministry of Industry and Trade of the Czech Republic). 20 µm.

Fetching data from Crossref.
This may take some time to load.