Marcos Pérez-Bahillo (Author), Nenad Gubeljak (Author), David A. Porter (Author), Beatriz López (Author), Jožef Predan (Author), Antonio Martín-Meizoso (Author)

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).Acombination 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

mikrolegirana jekla;mehanske lastnosti;niobij;microalloyed steels;mechanical properties;niobium;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FS - Faculty of Mechanical Engineering
UDC: 620.172.18:669.15-194
COBISS: 15654934 Link will open in a new window
ISSN: 1330-3651
Views: 1418
Downloads: 87
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Other data

Secondary title: Modeli za ispitivanje rastezne čvrstoće nisko-ugljičnih mikrolegiranih čelika s visokim sadržajem niobija
Secondary abstract: U ovom se istraživanju proučavao utjecaj parametara valjanja (2 redukcijske brzine i 3 brzine hlađenja) i kemijskih elemenata kao što su: C, Mn, Nb, Ti, Mo, Ni, Cr, CuiB na svojstva čvrstoće niskougljičnih mikrolegiranih čelika s visokim sadržajem niobija (do 0,12 wt.%Nb). U tu je svrhu konstruiran pokusni uređaj zasnovan na inteligentnom dizajnu eksperimenata (DoE), rezultirajući s 26 odljevaka (laboratorijskih odljevaka). Kombinacijom metalografije, Electron Back-Scattered Diffraction (EBSD) i vlačnih ispitivanja proučavalo se kako obradni parametri i kemijski sastav djeluju na čvrstoću. Kada je ispitivanje rezultiralo naprezanjem, rasteznom čvrstoćom, jednoličnom deformacijom ili deformacijom zbog loma, rezultati su statistički analizirani tehnikom višestruke linearne regresije, koja je dovela do odgovarajućih jednadžbi. Ustanovilo se da se učinak niobija na povećanje čvrstoće smanjuje kako se povećava sadržaj ugljika.
Secondary keywords: mikrolegirana jekla;mehanske lastnosti;niobij;
URN: URN:SI:UM:
Type (COBISS): Scientific work
Pages: str. 561-569
Volume: ǂVol. ǂ18
Issue: ǂno. ǂ4
Chronology: Pros. 2011
ID: 8718236