Influence of Cobalt in the Tensile Properties of ½ Inch Ductile Iron Y-blocks

Almanza, Alejandra; Dewald, D.K.; Licavoli, Joseph J.; Sanders, Paul G.

doi:10.1007/s40962-020-00521-3

Cited by 3 publications

(9 citation statements)

References 11 publications

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“…A consistent reduction in the nodule diameter with increasing cobalt was observed for both the first and last Y-blocks poured (Figure 4.43). This finding is in agreement with previous work that report a decrease in the nodule size with cobalt additions [58], [63], [81].…”

Section: Graphite Analysissupporting

confidence: 94%

“…These results reflect those of Okunnu, who found an increase in the Vickers hardness for two 600-10 SSF grades alloyed with 2 wt.% and 4 wt.% Co [63]. Other researchers have found increasing hardness with increasing cobalt in ductile irons with lower silicon contents [58], [81].…”

Section: Microhardness Evaluationsupporting

confidence: 87%

“…Ferrite, pearlite, and carbide percentages for all section thicknesses[79].4.1.2.2 ASTM ½ inch Y-blocks4.1.2.2.1 Graphite AnalysisThe unetched micrographs at 50x of the first and last Y-blocks poured show that adding cobalt results in an increase in nodule count and a decrease in the nodule size (Figure Unetchedmicrographs at 50x of the first and last ½ inch Y-blocks poured[81].For the first Y-blocks poured, there was not a substantial difference in nodularity among all the heats(Figure 4.7). A decrease in nodularity with time is observed when comparing the first and last Y-blocks poured likely due to Mg fade(Figure 4.7).…”

mentioning

confidence: 99%

“…Nodule diameter of the first and last ½ inch Y-blocks poured. Error bars are 95% standard error of the mean[81].4.1.2.2.2 Ferrite and Pearlite AnalysisCompared to the base ductile iron heat, the 4 wt.% Co heat showed an increase in ferrite percentage for the first and last Y-blocks poured (10 Nital etched micrographs at 50x of the first and last ½ inch Y-blocks poured[81].An increase in ferrite and a decrease in pearlite is observed for the first Y-blocks poured with cobalt additions(Figure 4.11). For the last Y-blocks poured, the 1 wt.%, and 3 wt.%Co additions showed a significant reduction in ferrite percentage.…”

mentioning

confidence: 99%

“…11 (a) Ferrite and (b) pearlite percentages of the first and last ½ inch Y-blocks poured. Error bars are 95% standard error of the mean[81].…”

mentioning

confidence: 99%

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Effect of Cobalt in Thin Wall Ductile Iron and Solid Solution Strengthened Ferritic Ductile Iron

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Section: Graphite Analysissupporting

confidence: 94%

Section: Microhardness Evaluationsupporting

confidence: 87%

mentioning

confidence: 99%

mentioning

confidence: 99%

“…11 (a) Ferrite and (b) pearlite percentages of the first and last ½ inch Y-blocks poured. Error bars are 95% standard error of the mean[81].…”

mentioning

confidence: 99%

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Effect of Cobalt in Thin Wall Ductile Iron and Solid Solution Strengthened Ferritic Ductile Iron

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Determination of Corrosion Resistance of High-Silicon Ductile Iron Alloyed with Nb

Valdez

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et al. 2023

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In this study, the effects of Nb on the microstructural characteristics, hardness, and corrosion resistance of high-silicon ductile cast iron (HSDI)-3.6 wt.% Si were investigated. Samples from different castings with 0–0.9 wt.% Nb were obtained and compared to a commercial ductile iron. Microstructures showed that the amount of ferrite in the matrix increased with increasing Nb content, from 34% for unalloyed HSDI to 88% for HSDI-0.9 wt.% Nb. The presence of randomly distributed NbC carbides was identified by EDX for all the samples alloyed with Nb, and the hardness of the HSDI increased with the Nb content. To evaluate the influence of the Nb content on the corrosion resistance of HSDI, potentiodynamic tests were carried out in a solution of H2SO4. The highest corrosion rate on HSDI was obtained for the HSDI-0.3 wt.% Nb sample, with 2802 mills per year, due to the amount of pearlite present and the lowest presence of NbC carbides, compared to the HSDI-0.9 wt.% Nb, with 986 mills per year. This behavior was attributed to the ferrite matrix obtained because of a high Si content in the DI, which delayed the anodic dissolution of the alloy and suppressed the pearlitizing effect of Nb for contents greater than 0.3 wt.%, as well as to the effect of NbC carbides, which acted as inhibitors.

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Influence of Cobalt in the Tensile Properties of ½ Inch Ductile Iron Y-blocks

Cited by 3 publications

References 11 publications

Effect of Cobalt in Thin Wall Ductile Iron and Solid Solution Strengthened Ferritic Ductile Iron

Effect of Cobalt in Thin Wall Ductile Iron and Solid Solution Strengthened Ferritic Ductile Iron

Effects of Nickel Contents on Phase Constituent and Mechanical Properties of Ductile Iron

Determination of Corrosion Resistance of High-Silicon Ductile Iron Alloyed with Nb

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