Technical gazette, Vol. 18 No. 4, 2011.
Original scientific paper
Tensile test models for low-carbon microalloyed steels with high niobium contents
Marcos Pérez-Bahillo
; Materials Department, CEIT and Tecnun, University of Navarra, Paseo Manuel Lardizabal 15, 20018, San Sebastian, Spain
Nenad Gubeljak
; Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, Maribor, Slovenia
David A. Porter
; Rautaruukki Oyj, Research Centre, P. O. Box 93, Raahe, Finland
Beatriz López
; Materials Department, CEIT and Tecnun, University of Navarra, Paseo Manuel Lardizabal 15, 20018, San Sebastian, Spain
Jožef Predan
; Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, Maribor, Slovenia
Antonio Martín-Meizoso
; Materials Department, CEIT and Tecnun, University of Navarra, Paseo Manuel Lardizabal 15, 20018, San Sebastian, Spain
Abstract
In the present investigation, the effect of both: rolling parameters (2 reduction rates and 3 cooling rates) and chemical elements such as: C, Mn, Nb, Ti, Mo, Ni, Cr, Cu and B, has been studied in relation to strength properties in low-carbon microalloyed steels with high niobium contents (up to 0,12 wt. % Nb). For this purpose, an experimental set-up was designed based on an intelligent design of experiments (DoE), resulting in 26 casts (laboratory casts). A combination of metallography, Electron Back-Scattered Diffraction (EBSD) and tensile tests have been performed to study how processing parameters and chemical composition affect the strength. The results, where the proof stress, tensile strength, uniform and fracture elongations are the response variables, have been analysed statistically by means of multiple linear regression technique, leading to response equations. From the results, it was found that the effectiveness of niobium increasing the strength is reduced as carbon content increases.
Keywords
microalloyed steels; mechanical properties; niobium
Hrčak ID:
75404
URI
Publication date:
27.12.2011.
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