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The mechanical properties of cast iron materials. 

The mechanical properties of cast iron materials. 

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Conference Paper
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In this study, the microstructural characterization of GG20 and GG25 gray cast iron materials were carried out and their fracture behavior was examined. These materials are commonly used in high pressure safety valves. In the first stage of the study, the matrix phases (ferrite/pearlite) were determined in addition to the morphology and distributio...

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... The pulse through raises concentration and generates a profound lowest point on the work piece material, also higher material. [15][16]. ...
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... This structure reveals few large graphite flakes enveloped in uniformly distributed rosette graphite flakes (type B). The observed structures are consistent with the previous works of Taslicukur et al. (2012) and Sahu et al. (2014). It was observed that the presence of copper decreases the growth and nucleation rate of the graphite flakes when added up to 0.8% but increases their growth and nucleation rate when increased to 1.1%. ...
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... Within a gray iron sample, multiple graphite flake layers contribute to successive reflection and transmission at many interfaces. Experimentally, such an interface can be viewed in fractographs or on etched surfaces [88,92]. The laser profilometer result for a gray iron fracture surface was given in Nakae [93] and is reproduced in Figure 16. ...
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... However, there are a little change in the morphology as the cooling proceeded to the grey zone which consists of more perfect randomly oriented and uniformly distributed Type-A graphite in a full fine pearlitic matrix due to the slow rate of cooling. The form and amount of this Type-A might be as a result of the incomplete secondary graphitization due to the improper MnS compound which serves as a major nucleation sites for graphite particularly at second stage of graphitization [20]. In Table 5, the micrographs show the microstructure morphology of 0.2wt% iron powder (Fe-Powder) + 0.3%wt FeSi alloy for wedge test sample W1 at various points. ...
... The high carbon and silicon content (CE=4.86%) also favoured the increase in graphitization potential which happen to be effective as a function of section sensitivity [20]. However, the high carbon and silicon content, proper %Mn x %S (0.051) which was within the range (0.03-0.06), proper inoculation treatments influence the formation of Type-A graphite despite low level of aluminium content. ...
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... Chemical composition of grey cast iron (% weight)[25] ...
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... 0.6025 material has perlite microstructure with graphite flakes. It has lower hardness and tensile strength, but greater impact toughness than GG-20 material [16]. The mechanical properties of GG-25/W.Nr. ...
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... Hardness values at three sample zones of casting is measured using Rockwell B scale to analyse the homogeneity of hardness values of the sample. To achieve homogenous chemical composition and hardness, the specimen is annealed at 800 0 C for 10 hours [24][25][26] The casting is turned in lathe to collect grey cast iron dust (debris), washed and preheated to 300 0 C for 1 hour to remove volatile substances present. Debris is ground in planetary ball mill as shown in figure 2 to reduce the size of particles upto 50 μm and sieving is performed to obtain uniform grade of particles. ...
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... Graphite flakes limit the strength of gray cast iron because they act as angular voids in the metal matrix, and because of their near continuous nature and sharp tips, which can act like preexisting cracks [29,30]. According to Tas liçukur et al. [31], failure occurs by crack initiation at the tips of these graphite flakes, propagating first along the graphite flake and then across the intercellular matrix space. Clearly it is this matrix between flakes that is responsible for the poor strength and ductility of gray cast irons. ...
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