Thermal analysis of compacted graphite cast irons containing various levels of Mg and S

1999 ◽  
Vol 11 (5) ◽  
pp. 381-386 ◽  
Author(s):  
S. Rodríguez ◽  
M. Castro ◽  
M. Herrera ◽  
J. Méndez ◽  
M. Méndez ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Cast Irons ◽  
Compacted Graphite

scholarly journals The Influence of Titanium as a Desferoidizing Element on the Stability of Production of Magnesium Cast Irons with Compacted Graphite

2021 ◽  
Vol 43 (4) ◽  
pp. 654-666
Author(s):  
V. Aulin ◽  
V. Kropivny ◽  
O. Kuzyk ◽  
O. Lyashuk ◽  
M. Bosyi ◽  
...  
Keyword(s):  
Cast Irons ◽  
Compacted Graphite ◽  
The Stability

scholarly journals Evolution of inoculation thermal analysis and solidification morphology of compacted graphite iron

2021 ◽  
Vol 59 (01) ◽  
pp. 51-57
Author(s):  
S. Ai ◽  
Z. Xu ◽  
Z. Liu ◽  
H. Song ◽  
A. Wang ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Compacted Graphite Iron ◽  
Compacted Graphite ◽  
Solidification Morphology

On the Prediction of Residual Magnesium and Nodularity in Ductile Iron by Thermal Analysis

2019 ◽  
Vol 287 ◽  
pp. 24-29
Author(s):  
Sarum Boonmee ◽  
Kittirat Worakhut ◽  
Auttachai Utsajai ◽  
Nupol Mai-Ngam ◽  
Suphalerk Rassamipat
Keyword(s):  
Thermal Analysis ◽  
Cooling Rate ◽  
Ductile Iron ◽  
Optical Emission ◽  
Magnesium Content ◽  
Emission Spectrometry ◽  
Cast Irons ◽  
Shape Factors ◽  
Spheroidal Shape ◽  
Sulfur Level

Morphology of graphite affects the mechanical and physical properties of cast irons. It is known that the spheroidal shape of graphite promotes both tensile strength and ductility. The morphology of graphite is generally quantified by the percent nodularity and/or graphite shape factors (e.g. roundness, sphericity, compactness, aspect ratio). From the quality control aspect, the nodularity is controlled by the residual magnesium content determined by the Optical Emission Spectrometry (OES). However, the nodularity is also affected by the cooling rate and the sulfur level. Therefore, the percent nodularity alone cannot be precisely predicted by the residual magnesium. In this study, the Thermal Analysis (TA) was used to predict the residual magnesium and the nodularity of ductile iron. The newly created TA demonstrated the reliable prediction as the effect of the residual magnesium, sulfur level and the cooling rate were combined in forms of cooling curves. The correlations of the residual magnesium, the Maximum Cooling Rate (MCR) and the angle of the cooling rate curve (θ) at the end of solidification were shown in this work. Finally, the relationships were used to encode in the software for the on-site prediction.

Relationship between dynamic and static toughness of flake and compacted graphite cast irons

2000 ◽  
Vol 282 (1-2) ◽  
pp. 115-122 ◽  
Author(s):  
Cheng-Hsun Hsu ◽  
Shen-Chih Lee ◽  
Yih-Hsun Shy ◽  
Wei-Tang Chiou
Keyword(s):  
Cast Irons ◽  
Compacted Graphite

Properties of austempered, low-manganese compacted-graphite cast irons

Cast Metals ◽  
1994 ◽  
Vol 7 (3) ◽  
pp. 143-151 ◽  
Author(s):  
A. L. Rimmer ◽  
R. Elliott
Keyword(s):  
Cast Irons ◽  
Compacted Graphite

Solidification of Flake, Compacted/Vermicular and Spheroidal Graphite Cast Irons as Revealed by Thermal Analysis and Directional Solidification Experiments

1984 ◽  
Vol 34 ◽  
Author(s):  
Doru Michael Stefanescu
Keyword(s):  
Thermal Analysis ◽  
Thermal Behavior ◽  
Directional Solidification ◽  
Spheroidal Graphite ◽  
Cast Irons ◽  
Quantitative Understanding

When trying to understand the thermal behavior of solidifying cast irons, two experimental procedures seem to be especially helpful in generating the expected type of information, which then can be used for a quantitative understanding of the phenomena. They are thermal analysis and directional solidification.

Digital Image Correlation Techniques for Analysing the Deformation Behaviour of Compacted Graphite Cast Irons on a Microstructural Level

2011 ◽  
Vol 70 ◽  
pp. 171-176 ◽  
Author(s):  
Torsten Sjögren ◽  
Fredrik Wilberfors ◽  
Monika Alander
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Strain Field ◽  
Deformation Behaviour ◽  
Image Correlation ◽  
Cast Irons ◽  
Graphite Phase ◽  
Compacted Graphite ◽  
Graphite Particles ◽  
Correlation Techniques

Digital image correlation techniques (DIC) have been used in this study to reveal how different phases (graphite, ferrite and pearlite) of compacted graphite cast irons (CGI) accommodate strains at loading. A DIC-software was used to analyse sets of successively acquired images. The images were acquired with a light optical microscope revealing the microstructure of polished and etched CGI materials at different load levels. Five CGI materials, having percentages of pearlite in the range 35 to 90 area%, were included in the study. Apart from the different matrix constituents (ferrite and pearlite) the nodularity was altered and varied from 5% to 65%. It is concluded from this study that the different phases in CGI are affected by the global strain and load to a greater or less extent. The graphite phase appears to accommodate high strains but, due to fracture of the graphite particles at relatively low strains, the resulting high strain values show the opening up of graphite cavities. The ferrite phase is subjected to a strain concentrating effect of the graphite phase and with a low nodularity, i.e., with graphite particles that are stretched out and interconnected, the effect becomes more pronounced resulting in high strains. The pearlitic phase is the strongest of the constituents within the microstructure and the lowest local strains are observed in this phase. The study shows that DIC strain-field images reveal the microstructural strain level distribution for the CGI materials. The future outlook is to use these sets of strain-field images for verification of micro mechanical finite element analysis on a microstructural scale of CGI materials.

Effect of Magnesium on Characteristics of Thermal Analysis Curve of Compacted Graphite Iron

2011 ◽  
Vol 284-286 ◽  
pp. 1021-1024
Author(s):  
Jin Hai Liu ◽  
Guo Lu Li ◽  
Xue Bo Zhao ◽  
Xiao Yan Hao
Keyword(s):  
Thermal Analysis ◽  
Eutectic Temperature ◽  
Molten Iron ◽  
Compacted Graphite Iron ◽  
Compacted Graphite ◽  
Thermal Analysis Curve ◽  
Compact Graphite ◽  
Fading Time

The influence of residual magnesium on compact graphite rate and characteristic of thermal analysis curve was studied by fading of magnesium treated molten iron. The results indicate that with fading time, the residual magnesium decreases and the rate of compact graphite increases. The content of magnesium can remarkably change the characteristics of thermal analysis curve, such as the lowest eutectic temperature (TEU) and the recalescence degree △Tr.

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