Phenomena of the intermediate low temperature embrittlement of ferritic ductile cast iron

Shiao, F. T.; Lui, Truan-Sheng; Chen, L. H.

doi:10.1080/13640461.1997.11819217

Cited by 3 publications

(5 citation statements)

References 11 publications

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“…This result by Chen et al is consistent with the current finding that the occurrence B. On the Tensile Embrittlement Behavior of tensile embrittlement is determined mainly by the degree of inclusion clustering, although their result also shows that The results in this study confirm the reported results that the mode of brittle fracture can be affected by the level of both the quasi-cleavage fracture in the intermediate lowtemperature range [4] and the intergranular fracture in the impurity segregation. V. CONCLUSIONS secondary dendrite arms.…”

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confidence: 95%

“…brittle fracture surface, the intergranular fracture in this interAccording to our recent tensile test results, [4] there exists mediate high-temperature range is also initiated from the a ductility drop at temperatures near the end of the upper inclusion clusters in the eutectic cell wall region. [6,7] elongation shelf and before the transition to the lower elonga-…”

Section: Introductionmentioning

confidence: 75%

“…tearing ridges, the zoned brittle area is covered by quasicleavage cracks, which are initiated from the clusters of inclusion particles in the eutectic cell wall region. [4] Earlier II. EXPERIMENTAL PROCEDURES in 1971, this zoned ductile and brittle fracture appearance Four SG-cast irons were chosen in this study.…”

Section: Introductionmentioning

confidence: 96%

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Eutectic cell wall morphology and tensile embrittlement in ferritic spheroidal graphite cast iron

Shiao

Lui

Chen

et al. 1999

Metall Mater Trans A

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Four ferritic spheroidal graphite (SG) cast irons (3.4C-3.9Si, 3.5C-2.7Si, 3.5C-2.0Si, and 2.0C-2.1Si, in wt pct) were chosen to study the eutectic cell morphology and the related tensile embrittlement. For the three test materials with high carbon concentration, the results indicate that the average eutectic cell wall size and the amount of cell wall inclusions decrease with decreasing silicon concentration. Compared to the test material with 3.5C-2.0Si, which has many inclusions dispersed in the ferrite matrix, the one with 2.0C-2.1Si shows larger average eutectic cell wall size and larger degree of inclusion clustering in the cell walls. Tensile embrittlement may occur in two temperature ranges, namely, the intermediate low-temperature range at the end of the upper elongation shelf and the intermediate high-temperature range of around 400 ЊC. In both cases, the brittle cracks are initiated preferentially at the inclusion clusters in the eutectic cell wall region. Hence, the two tensile embrittlements occur only for the materials with a larger degree of inclusion clustering in the eutectic cell walls.

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Section: And the Least Amountsupporting

confidence: 95%

Section: Introductionmentioning

confidence: 75%

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Eutectic cell wall morphology and tensile embrittlement in ferritic spheroidal graphite cast iron

Shiao

Lui

Chen

et al. 1999

Metall Mater Trans A

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“…3.1 Effect of solidification cooling rate on the variation of eutectic cell morphologies From previous investigations, [8][9][10] it is clear that the tensile properties of SG cast iron at elevated temperatures are strongly dependent on the feature of the eutectic cell morphology. Figure 3 shows the electrochemically-etched ferritic SG cast iron, the morphology of the eutectic cell wall is marked by arrows.…”

Section: Resultsmentioning

confidence: 99%

“…This was the dominant factor causing a deterioration in tensile properties after the specimen suffered a cyclic heating process. [8][9][10][11][12][13][14] In this case, in spite of the tensile tested be performed at room temperature, ductility deterioration caused by intergranular fracture was identified. This raises the questions of how the dispersed MgO inclusions affect the intergranular fracture behavior, and the effect of the eutectic cell wall morphology during these severe cyclic heating/ cooling processes on reliability.…”

Section: Introductionmentioning

confidence: 99%

Effect of Microstructural Refinement on Ductility Deterioration of High Silicon Ferritic Spheroidal Graphite Cast Iron Caused by Cyclic Heating

2003

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This investigation applies cyclic heating and cooling to elucidate the effect of microstructural refinement on the tensile elongation deterioration of ferritic spheroidal graphite cast iron. In order to eliminate the oxidation factor, the cyclic heating/cooling test was performed in a 1:33 $ 0:133 Pa ambient vacuum atmosphere with cyclic heating at a maximum temperature of 1023 K. Severe embrittlement accompanied by intergranular fracture occurred after the ferritic spheroidal graphite cast iron was subjected to a certain number of heating and cooling cycles. A fair amount of inevitable inclusion particles were found to agglomerate in the eutectic cell boundary region, and so the cyclic heating induced embrittlement can be recognized to be strongly dependent on the solidification cooling rate of the materials. Based on experimental evidence, the cracking evolution can be divided into three steps: (1) crack initiation from the vicinity of the eutectic cell boundary at the surface, (2) crack linking and major crack formation, and (3) major crack inward extension. Cyclic heating cracks are mainly initiated at the eutectic cell boundary where a fair amount of MgO inclusions dispersed, and consequently propagated along the annealed eutectic cell boundary. While investigating the plastic deformation behaviors around the above mentioned MgO inclusions pertaining to the crack initiation and crack propagation, typical etch pit evidence was observed in the vicinity of the cell boundary area.

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Distribution of the Inclusion Particles in Ferritic Spheroidal Graphite Cast Irons

1998

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Phenomena of the intermediate low temperature embrittlement of ferritic ductile cast iron

Cited by 3 publications

References 11 publications

Eutectic cell wall morphology and tensile embrittlement in ferritic spheroidal graphite cast iron

Eutectic cell wall morphology and tensile embrittlement in ferritic spheroidal graphite cast iron

Effect of Microstructural Refinement on Ductility Deterioration of High Silicon Ferritic Spheroidal Graphite Cast Iron Caused by Cyclic Heating

Distribution of the Inclusion Particles in Ferritic Spheroidal Graphite Cast Irons

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