As cast high silicon ductile irons with optimised mechanical properties and remarkable fatigue properties

Abstract

To cite this version:Urko de La Torre, Aitor Loizaga, Jacques Lacaze, Jon Sertucha. As cast high silicon ductile irons with optimised mechanical properties and remarkable fatigue properties. Materials Science and Technology, Maney Publishing, 2014, vol. 30 (n°12) The present work shows a comparative study regarding the mechanical properties of 25 as cast ferritic ductile iron alloys, nine of them with silicon contents higher than 3?00% and carbon contents lower than 3?60%. In a first step, different carbon equivalent values have been used in order to analyse the effect of this parameter on the mechanical properties. After this comparative analysis, the composition ranges C53?30-3?40 wt-% and Si53?75-3?80 wt-% have been selected as the most proper ones to optimise the tensile and impact properties among the high silicon ductile iron alloys. Finally, a second study was carried out to compare the tensile and fatigue properties of the optimised high silicon alloy with the corresponding ones obtained from an EN GJS 400-18-LT grade alloy with low silicon content. Although the room temperature impact values obtained from the high silicon ductile iron are lower than 6 J cm 22 , the measured fatigue limit of this alloy (358 MPa) is clearly higher than the one obtained from the low silicon cast iron (170 MPa). A discussion about the benefits and advantages of the high silicon alloy is included.

Comportamiento frente a la corrosión de fundiciones con grafito laminar y esferoidal parcialmente modificadas con silicio en NaCl 0,03 M

“…Las fundiciones esferoidales con elevados contenidos de Si muestran una matriz mayoritariamente ferrítica, por lo que presentan altas ductilidades y comportamientos favorables frente al mecanizado, aunque dicha matriz se endurece considerablemente, aumentando la carga de rotura y el límite elástico del material (de la Torre et al, 2014).…”

Statistical study to determine the effect of carbon, silicon, nickel and other alloying elements on the mechanical properties of as-cast ferritic ductile irons

“…All details on melt preparation and casting procedures have already been given Sertucha et al, 2012;De la Torre et al, 2014). In the present work, only results obtained on materials cast in standard keel-blocks (type II according to EN 1563) and in as-cast state will be considered.…”

“…In their as-cast state, the 6 alloys of the Ni-series contained significant amounts of pearlite . Finally, 4 out of the 25 alloys in the Si-series showed a pearlite amount higher than 2% (De la Torre et al, 2014). On the whole, the present analysis is going to be carried out on 52 fully ferritic alloys and 38 alloys showing amounts of pearlite ranging in between 3% and 33%.…”

“…In recent years, the present authors have studied mechanical properties of three successive series of ferritic grades putting emphasis on the effect of alloying and low level elements , investigating more particularly the effect of nickel and of silicon (De la Torre et al, 2014). All this information is used here to update the statistical analysis that was performed on the first series of results.…”

Influence of graphite morphology on static and cyclic strength of ferritic nodular cast iron

“…However, this data is statistically secured poorly and large deviations occurred during testing. La Torre [8] detected high disparity between silicon alloyed and conventional DCI. In tensile fatigue testing, a 3.78 % Si alloy reached 358 MPa fatigue limit and a low silicon alloyed DCI 170 MPa.…”