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Microstructure and mechanical properties of Fe-Cr-C-Nb white cast irons

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2013
1-s2.0-S0261306912008618-main.pdf (2.477Mb)
Authors
Filipović, Mirjana
Kamberović, Željko
Korać, Marija
Gavrilovski, Milorad
Article (Published version)
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Abstract
The microstructure and properties of 17 wt.% Cr-2.9 wt.% C cast irons with up to 3.17 wt.% Nb additions, in both as-cast and heat treated state, have been studied. Also the influence of titanium and cerium on the structure and properties of 17 wt.% Cr-2.9 wt.% C-2 wt.% Nb alloys are examined. NbC carbides present in the structure of tested alloys, due to their characteristic morphology, show higher wear resistance and toughness than M7C3 carbides. Increasing amount of this type of carbides, caused by the increase of niobium in Fe-Cr-C-Nb alloys, contributes to the improvement of wear resistance and dynamic fracture toughness. The alloy containing approximately 3% Nb gives the best compromise between wear resistance and fracture toughness. This alloy shows about 30% greater dynamic fracture toughness and about 30% greater abrasion wear resistance than the basic Fe-Cr-C alloy. Titanium and cerium affect the crystallisation process of Fe-Cr-C-Nb alloys and the transformation of austenite ...during the cooling after solidification. The addition of 0.26% Ti results in a substantial change in the morphology and distribution of NbC carbides. The secondary carbides which precipitate in the matrix regions of the tested 17 wt.% Cr-2.9 wt.% C-2 wt.% Nb white iron containing titanium has an impact on the abrasion behaviour and fracture toughness. The alloy containing 0.28% Ti and 0.19% Ce has pearlite-austenitic matrix microstructure in as-cast condition. The pearlite, due to its high microhardness, improves the wear resistance under low-stress abrasion conditions, but drastically reduces the toughness of tested alloy.

Keywords:
Cast irons / Matrix microstructure / Hardness / Fracture toughness / Wear resistance
Source:
Materials & Design, 2013, 47, 41-48
Publisher:
  • Elsevier Sci Ltd, Oxford
Funding / projects:
  • Innovative synergy of by-products, waste minimization and clean technologies in metallurgy (RS-34033)

DOI: 10.1016/j.matdes.2012.12.034

ISSN: 0264-1275

WoS: 000315336200007

Scopus: 2-s2.0-84872410606
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URI
http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2504
Collections
  • Radovi istraživača / Researchers’ publications (TMF)
Institution/Community
Tehnološko-metalurški fakultet
TY  - JOUR
AU  - Filipović, Mirjana
AU  - Kamberović, Željko
AU  - Korać, Marija
AU  - Gavrilovski, Milorad
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2504
AB  - The microstructure and properties of 17 wt.% Cr-2.9 wt.% C cast irons with up to 3.17 wt.% Nb additions, in both as-cast and heat treated state, have been studied. Also the influence of titanium and cerium on the structure and properties of 17 wt.% Cr-2.9 wt.% C-2 wt.% Nb alloys are examined. NbC carbides present in the structure of tested alloys, due to their characteristic morphology, show higher wear resistance and toughness than M7C3 carbides. Increasing amount of this type of carbides, caused by the increase of niobium in Fe-Cr-C-Nb alloys, contributes to the improvement of wear resistance and dynamic fracture toughness. The alloy containing approximately 3% Nb gives the best compromise between wear resistance and fracture toughness. This alloy shows about 30% greater dynamic fracture toughness and about 30% greater abrasion wear resistance than the basic Fe-Cr-C alloy. Titanium and cerium affect the crystallisation process of Fe-Cr-C-Nb alloys and the transformation of austenite during the cooling after solidification. The addition of 0.26% Ti results in a substantial change in the morphology and distribution of NbC carbides. The secondary carbides which precipitate in the matrix regions of the tested 17 wt.% Cr-2.9 wt.% C-2 wt.% Nb white iron containing titanium has an impact on the abrasion behaviour and fracture toughness. The alloy containing 0.28% Ti and 0.19% Ce has pearlite-austenitic matrix microstructure in as-cast condition. The pearlite, due to its high microhardness, improves the wear resistance under low-stress abrasion conditions, but drastically reduces the toughness of tested alloy.
PB  - Elsevier Sci Ltd, Oxford
T2  - Materials & Design
T1  - Microstructure and mechanical properties of Fe-Cr-C-Nb white cast irons
EP  - 48
SP  - 41
VL  - 47
DO  - 10.1016/j.matdes.2012.12.034
ER  - 
@article{
author = "Filipović, Mirjana and Kamberović, Željko and Korać, Marija and Gavrilovski, Milorad",
year = "2013",
abstract = "The microstructure and properties of 17 wt.% Cr-2.9 wt.% C cast irons with up to 3.17 wt.% Nb additions, in both as-cast and heat treated state, have been studied. Also the influence of titanium and cerium on the structure and properties of 17 wt.% Cr-2.9 wt.% C-2 wt.% Nb alloys are examined. NbC carbides present in the structure of tested alloys, due to their characteristic morphology, show higher wear resistance and toughness than M7C3 carbides. Increasing amount of this type of carbides, caused by the increase of niobium in Fe-Cr-C-Nb alloys, contributes to the improvement of wear resistance and dynamic fracture toughness. The alloy containing approximately 3% Nb gives the best compromise between wear resistance and fracture toughness. This alloy shows about 30% greater dynamic fracture toughness and about 30% greater abrasion wear resistance than the basic Fe-Cr-C alloy. Titanium and cerium affect the crystallisation process of Fe-Cr-C-Nb alloys and the transformation of austenite during the cooling after solidification. The addition of 0.26% Ti results in a substantial change in the morphology and distribution of NbC carbides. The secondary carbides which precipitate in the matrix regions of the tested 17 wt.% Cr-2.9 wt.% C-2 wt.% Nb white iron containing titanium has an impact on the abrasion behaviour and fracture toughness. The alloy containing 0.28% Ti and 0.19% Ce has pearlite-austenitic matrix microstructure in as-cast condition. The pearlite, due to its high microhardness, improves the wear resistance under low-stress abrasion conditions, but drastically reduces the toughness of tested alloy.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Materials & Design",
title = "Microstructure and mechanical properties of Fe-Cr-C-Nb white cast irons",
pages = "48-41",
volume = "47",
doi = "10.1016/j.matdes.2012.12.034"
}
Filipović, M., Kamberović, Ž., Korać, M.,& Gavrilovski, M.. (2013). Microstructure and mechanical properties of Fe-Cr-C-Nb white cast irons. in Materials & Design
Elsevier Sci Ltd, Oxford., 47, 41-48.
https://doi.org/10.1016/j.matdes.2012.12.034
Filipović M, Kamberović Ž, Korać M, Gavrilovski M. Microstructure and mechanical properties of Fe-Cr-C-Nb white cast irons. in Materials & Design. 2013;47:41-48.
doi:10.1016/j.matdes.2012.12.034 .
Filipović, Mirjana, Kamberović, Željko, Korać, Marija, Gavrilovski, Milorad, "Microstructure and mechanical properties of Fe-Cr-C-Nb white cast irons" in Materials & Design, 47 (2013):41-48,
https://doi.org/10.1016/j.matdes.2012.12.034 . .

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