In situ synchrotron investigation of degenerate graphite nodule evolution in ductile cast iron

2021 ◽  
pp. 117367
Author(s):  
T. Wigger ◽  
T. Andriollo ◽  
C. Xu ◽  
S.J. Clark ◽  
Z. Gong ◽  
...  
Keyword(s):  
Cast Iron ◽  
Ductile Cast Iron ◽  
Graphite Nodule

A General Process for In Situ Formation of Iron-Matrix Composites Reinforced by Carbide Ceramic

2016 ◽  
Vol 852 ◽  
pp. 461-466 ◽  
Author(s):  
Xin Wang ◽  
Li Sheng Zhong ◽  
Na Na Zhao ◽  
Vladimir E. Ovcharenko ◽  
Yun Hua Xu
Keyword(s):  
Cast Iron ◽  
High Hardness ◽  
Ductile Cast Iron ◽  
Matrix Composites ◽  
Iron Matrix ◽  
General Process ◽  
Ceramic Particles ◽  
Wide Range ◽  
The Matrix

Ceramic particles (such as VC, NbC, TiC, and WC), which exhibit high hardness and thermal stability, can be used for in situ fabrication of carbide-reinforced iron matrix composites with high macro-hardness and toughness. In this study, we describe a novel in situ process comprising infiltration casting and heat treatment to form carbide-reinforced iron matrix composites with hard ceramic particles. Our proposed approach was used to integrate different alloy wires, which can easily form carbides, into the metal matrix and cast a known amount of carbon, such as gray cast iron, ductile cast iron, or ordinary white cast iron, to form alloy-reinforced iron matrix composites. Thermal treatment of the resulting composites allowed the alloy elements of the wire to react with carbon in the matrix to form evenly distributed carbide particles. This approach can be applied to a wide range of materials with different morphologies for fabricating composites, machining tools, and wear-resistant components.

Graphite nodule morphology as an indicator of the local complex strain state in ductile cast iron

2013 ◽  
Vol 52 ◽  
pp. 524-532 ◽  
Author(s):  
Isabel Hervas ◽  
Mohamed Ben Bettaieb ◽  
Anthony Thuault ◽  
Eric Hug
Keyword(s):  
Cast Iron ◽  
Strain State ◽  
Ductile Cast Iron ◽  
Graphite Nodule ◽  
Local Complex ◽  
Complex Strain ◽  
Nodule Morphology

Modeling of Distribution of Visible and Non-Visible Graphite Nodules Embedded in the Surface Layer of Ductile Cast Iron

2010 ◽  
Vol 659 ◽  
pp. 453-458
Author(s):  
Tamás Réti ◽  
Mihály Réger ◽  
Ágnes Csizmazia ◽  
Imre Czinege
Keyword(s):  
Cast Iron ◽  
Surface Defects ◽  
Defect Formation ◽  
Structural Parameters ◽  
Ductile Cast Iron ◽  
Graphite Nodule ◽  
Image Analyzer ◽  
Local Surface ◽  
Cast Irons ◽  
Surface Damages

The graphite nodule count and size distribution are important structural parameters in the quantitative characterization of the microstructure of ductile cast irons. In several cases, it is observed that local surface damages (cracks or microchip formations) are generated by the final manufacturing process (superfinishing operation), and these defects are originated basically from the hidden (invisible) graphite nodules located directly below surface. Based on measured data obtained by an image analyzer, a stereological model and a simulation algorithm have been developed to analyse the correspondances between the graphite morphology and the defect formation. This method makes it possible to establish a correlation between the microstructure parameters and the occurrence of local surface defects on ductile cast iron components.

scholarly journals X-Ray Imaging of Formation and Growth of Spheroidal Graphite in Ductile Cast Iron

2018 ◽  
Vol 925 ◽  
pp. 104-109 ◽  
Author(s):  
Hideyuki Yasuda ◽  
A. Sugiyama ◽  
C. Kiattisaksri ◽  
Kohei Morishita ◽  
Tomoya Nagira ◽  
...  
Keyword(s):  
Cast Iron ◽  
Eutectic Growth ◽  
Ductile Cast Iron ◽  
Eutectic Solidification ◽  
Spheroidal Graphite ◽  
In Situ Observation ◽  
X Rays ◽  
Graphite Particles ◽  
Specimen Holder

Time-resolved and in-situ observations using synchrotron radiation X-rays were performed to observe solidification of cast iron (CE=4.5, 0.02mass%Mg). Morphology of graphite particles was influenced by specimen holder material. In the Al2O3 holder, graphite particles were spheroidal at the beginning and then deviated from the spheroidal shape. In addition, the coupled eutectic solidification of austenite and graphite occurred at the final stage. In contrast, the divorced eutectic solidification, in which graphite particles and austenite dendrites independently grew, was selected until the end of solidification in MgO holder. Spheroidal graphite particles were engulfed by austenite. Consequently, typical microstructure observed in ductile cast iron was reproduced in the in-situ observation. The results suggested that oxygen potential, which was determined by Al2O3 or MgO (specimen holder) in the observations, could be an important factor for the selection of eutectic growth mode and graphite morphology.

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