Ductile irons damaging micromechanims graphite nodules
DCIs damage micromechanisms analysis is usually mainly focused on voids nucleation and growth due to the matrix-graphite nodules debonding 3-9 and numerous studies provided analytical laws to describe a single void growth depending on the void geometries and matrix behaviour (Fig. 1). Ductile cast iron EN GJS350-22 chemical composition
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Solidification of Thin Wall Ductile Iron Castings with
Ductile iron characterize high sensitivity on cooling rate what in consequence leads to structural gradients.1 2) As a result there are continuous changes of structural features of cast iron with changes of its properties accordingly. It has been proved3 4) that it is possible to produce thin wall ductile iron (TWDI) with wall thickness even below
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THE MORPHOLOGY OF DUCTILE CAST IRON SURFACE
ductile cast iron was used. The chemical composition (in wt. ) of ductile cast iron was as follows 3.53 C 2.53 Si 0.347 Mn 0.045 Cu 0.069 Ni 0.055 Cr 0.031 Mg and the rest was Fe. Ductile cast iron was produced by a sandwich spheroidization treatment (i.e. the melt was poured into the green sand moulds and 25-mm-thick Y block castings
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Modeling of damage in ductile cast ironThe effect of
Modeling of damage in ductile cast ironThe effect of including plasticity in the graphite nodules . T Andriollo. 1 different competing damage mechanisms seem to be active in the matrix and/or in the nodule . 6 develop during the cooling phase of the manufacturing process as
Get PriceMechanical properties dependency of the pearlite content
content of ductile irons Journal of Achievements in Materials and Manufacturing Engineering 33/2 (2009) . 1. Introduction Ductile cast iron has a short and important history because was not developed until 1948. In the last three decades the ductile cast iron production (also known as Nodular iron) has been increased.
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Study on Damage Mechanism of Ductile Cast Iron Cooling
Abstract. The damage mechanism of ductile cast iron cooling stave applied to No.4 blast furnace of Guofeng steel was analyzed through damage investigation in details the damage causes high-temperature gas flow erosion wear of burden high-temperature ablation carburizing damage improper operation on blast furnace etc. were given out both in macroscopic and microscopic views.
Get PriceDamage modelling in nodular cast iron
The damage mechanism of two types of ductile cast iron have been studied by precise microscopical observations and careful chemical morphological and mechanical characterizations. Two modes of damage are observed as a function of graphite morphology the
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Ductile Iron Society Research Committee Report Compiled by
Ductile Iron Society-Research Committee Report literature Summary Deteriorated Graphite in Casting Surfaces SUMMARY DIS Research has shown that a considerable drop in the fatigue life of ductile iron castings occurs when there are surface defects or deteriorated graphite in the skin of castings.
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Processing Techniques and Productions of Ductile Iron A
of these techniques and the applications of ductile cast iron. 2 P. RODUCION OF . D. UCTILE . I. RON. Ductile iron is made by the treatment of molten iron with no-dulizing (spheroidizing) material. During this treatment gra-phite changes from flakes to nodules or spheres. The treatment process is a key operation in the production of ductile iron
Get PriceDiffusion Modeling and Experimental Verification of
using thermal analysis of as-cast heat treated and hot plastically deformed ductile iron. PROCEDURES MODELING The rate of eutectoid reaction in ductile iron during continuous cooling casting is generally controlled by long-range interstitial carbon diffusion from carbon saturated austenite through the growing ferrite shell to graphite nodules.
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A study of feeding distance of SG iron castings.Free
May 30 2016 · An experimental and numerical analysist correlate variation on ductility to defects and microstructure in ductile cast iron component Engineering fracture mechanics 73(9) . 2. Lacaze J. M. Castro and G.L. Esoult 1998. Solidification of spheroidal graphit cast iron-IInumerical simulation Actamater 6 . 3.
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Ductile and Gray Cast Irons Deterioration with Time in
on the exterior of gray and ductile cast iron pipes are electrochemical corrosion with damage occurring in the form of pits. The damage to gray cast iron is often disguised by the presence of "graphitization". Graphitization is a term used to describe the network of graphite flakes that remain behind after the iron in the pipe has been leached
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Capturing the Complexities of Ductile Iron
As the metal casting marketplace continues to expand and as the migration of raw material drives baseline costs higher the stability of ductile iron makes it the workhorse alloy for high strength applications. In addition the unique expansion behavior of ductile iron during solidification allows for high yields co mpared to other materials making it an economical choice.
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Ductile Iron DataSection 3Part 2
Ductile Iron like most ferrous materials exhibits fracture behaviour which varies according to composition microstructure temperature strain rate and stress state. At low temperatures brittle failure occurs by the formation of cleavage cracks producing a facetted shiny fracture surface.
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THE MORPHOLOGY OF DUCTILE CAST IRON SURFACE
ductile cast iron was used. The chemical composition (in wt. ) of ductile cast iron was as follows 3.53 C 2.53 Si 0.347 Mn 0.045 Cu 0.069 Ni 0.055 Cr 0.031 Mg and the rest was Fe. Ductile cast iron was produced by a sandwich spheroidization treatment (i.e. the melt was poured into the green sand moulds and 25-mm-thick Y block castings
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Damage modelling in nodular cast iron
The damage mechanism of two types of ductile cast iron have been studied by precise microscopical observations and careful chemical morphological and mechanical characterizations. Two modes of damage are observed as a function of graphite morphology the
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Ductile and Gray Cast Irons Deterioration with Time in
on the exterior of gray and ductile cast iron pipes are electrochemical corrosion with damage occurring in the form of pits. The damage to gray cast iron is often disguised by the presence of "graphitization". Graphitization is a term used to describe the network of graphite flakes that remain behind after the iron in the pipe has been leached
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(PDF) Micromechanical Modeling of Ductile Cast Iron
The study addresses manifold aspects which have critical effect on the effective predicting capabilities of UCM such as the damage mechanism for the matrix type the role of the residual stresses and strain resulting from the cooling down process the spheroid effective shape and its constitutive response the effect of stress triaxiality on
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A Thermomechanical Fatigue Analysis on a Ductile Cast Iron
Mo-containing ductile cast iron have been extensively tested at room temperature (RT) and at elevated temperatures including tensile cyclic hold creep and TMF tests. The test data are used to create a two-layer model for stress/strain evaluations and a Neu-Sehitoglu model for TMF life prediction of the ductile cast iron exhaust manifold.
Get PriceA Thermomechanical Fatigue Analysis on a Ductile Cast Iron
Mo-containing ductile cast iron have been extensively tested at room temperature (RT) and at elevated temperatures including tensile cyclic hold creep and TMF tests. The test data are used to create a two-layer model for stress/strain evaluations and a Neu-Sehitoglu model for TMF life prediction of the ductile cast iron exhaust manifold.
Get PriceStudy of the fracture of ferritic ductile cast iron under
In this study fracture surfaces of ferritic ductile cast iron (or ferritic spheroidal graphite cast iron) generated under impact bending and fatigue loading conditions were characterised and compared. The fracture surfaces were characterised qualitatively and quantitatively from the observation under a scanning electron microscope.
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Metallography and Microstructures of Cast Iron
iron-carbon alloys. In cast iron which is a mul-ticomponent alloy these temperatures can be changed by different factors chemical compo-sition ability of cast iron for nucleation and cooling rate. Silicon and phosphorus both strongly affect the carbon content of the eutectic. That dependence was defined as a carbon equiv-alent (C e
Get PriceInvestigation of Phase Transformations in Ductile Cast Iron
Studies were carried out on commercial ductile iron of the EN-GJS (PN-EN 1563 2000) grade. The cast iron is used for slot grids operating in a linear water disposal system. Table 1 gives the chemical composition of cast iron. In as-cast condition the cast iron
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Thermal Analysis of Ductile Iron Casting IntechOpen
Apr 10 2017 · The thermal analysis of the ductile iron melts at different processing stages was conducted to study the effect of processing on solidification parameters. The cups were poured with base metal after addition of FeSiMg alloy in the melt and inoculation processing. Cooling curves were plotted as shown in Figure 4.
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(PDF) Design and Solidification Simulation of Exhaust
The present study deals with the solidification simulation of exhaust manifolds four in numbers in sand moulds made of SiMo Ductile cast iron using MAGMASOFT. A proper top gating system was
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Investigation of Phase Transformations in Ductile Cast Iron
Studies were carried out on commercial ductile iron of the EN-GJS (PN-EN 1563 2000) grade. The cast iron is used for slot grids operating in a linear water disposal system. Table 1 gives the chemical composition of cast iron. In as-cast condition the cast iron
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Ductile Cast Iron Induction Re-MeltingIJERT Journal
The effect of liquid ductile cast iron exposure on kinetics of graphite sphericity reduction is given in Table 1.1. In this study the initial cast iron with stable chemical composition was smelted in a furnace with basic lining at °C and treated with optimal amounts of given modifiers.
Get PriceMechanism of Damage of Ferritic Ductile Iron Influence of
The assessment of the micro-scale damage mechanisms was performed by in-situ optical microscopy observation of tensile tests of very small specimens.The results led to the quantification of the differences in mechanical properties along the metallic matrix as a result of the existing heterogeneities and allow for a better understanding of the ductile iron damage mechanism.
Get PriceTHE MORPHOLOGY OF DUCTILE CAST IRON SURFACE
ductile cast iron was used. The chemical composition (in wt. ) of ductile cast iron was as follows 3.53 C 2.53 Si 0.347 Mn 0.045 Cu 0.069 Ni 0.055 Cr 0.031 Mg and the rest was Fe. Ductile cast iron was produced by a sandwich spheroidization treatment (i.e. the melt was poured into the green sand moulds and 25-mm-thick Y block castings
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