Study of microstructure and silicon segregation in cast iron using color etching and electron microprobe analysis

Vazehrad, Sadaf; Elfsberg, Jessica; Diószegi, Attila

doi:10.1016/j.matchar.2014.09.008

Cited by 30 publications

(25 citation statements)

References 4 publications

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“…More details regarding the tinting procedure and the interpretation of the resulting patterns are available elsewhere. [22] V. RESULT AND DISCUSSION…”

Section: B Selective Tintingmentioning

confidence: 99%

Size Distribution of Graphite Nodules in Hypereutectic Cast Irons of Varying Nodularity

Domeij

Hernando

Diószegi

2018

Metall Mater Trans B

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An SGI was machined into 400 g cylindrical pieces and remelted in an electrical resistance furnace protected by Ar gas to produce materials ranging from SGI to CGI. The graphite morphology was controlled by varying the holding time at 1723 K (1450°C) between 10 and 60 minutes. The discrete sectional size distribution of nodules by number density was measured on cross sections of the specimens and translated to volumetric distribution by volume fraction. Subpopulations of nodules were distinguished by fitting Gaussian distribution functions to the measured distribution. Primary and eutectic graphite, were found to account for most of the volume of nodular graphite in all cases. For holding times of 40 minutes and greater, corresponding to nodularity roughly below 40 pct, the primary subpopulation was very small and difficult to distinguish, leaving eutectic nodules as the dominant subpopulation. The mode and standard deviation of the two subpopulations were roughly independent of nodularity. Moreover, the nodular and vermicular graphite were segregated in the microstructure. In conclusion, the results suggest that the parallel development of the vermicular eutectic had small influence on the size distribution of eutectic graphite nodules.

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“…More details regarding the tinting procedure and the interpretation of the resulting patterns are available elsewhere. [22] V. RESULT AND DISCUSSION…”

Section: B Selective Tintingmentioning

confidence: 99%

Size Distribution of Graphite Nodules in Hypereutectic Cast Irons of Varying Nodularity

Domeij

Hernando

Diószegi

2018

Metall Mater Trans B

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“…This is further complicated by the specimen being tinted by immersion in the reagent which is practically opaque, meaning that evaluating the result of the etching demands that the etching process is interrupted and the specimen is washed and dried. In case of over-or underetching, the specimen is repolished and the procedure is started over; however, some success has been reported in resuming the etching in case of under-etching, allowing for step-wise etching until the result is satisfactory [12]. Also, despite a good coloring, some difficulties in measuring the dendrites remain.…”

Section: Dendritic Austenite In As-cast Graphite Ironsmentioning

confidence: 99%

Quantification of Dendritic Austenite After Interrupted Solidification in a Hypoeutectic Lamellar Graphite Iron

Domeij

Hernando

Diószegi

2015

Metallogr. Microstruct. Anal.

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This paper presents an unconventional etching technique to reveal the microstructure in a hypoeutectic lamellar graphite iron that has been quenched after isothermal heat treatment in the proeutectic semi-solid temperature region. A technique for quantifying the dendrite microstructure using the aforementioned etching technique involving a combination of a raster graphics editor and an image analysis software is outlined. The agreement between this quantification technique with regard to volume fraction and surface area per unit volume of the dendritic austenite and corresponding point counting and line intercept techniques is analyzed. The etching technique was found useful but sporadic tinting of martensite was problematic. Some measurements showed significant systematic disagreement which correlated with the coarseness of the measured dendrites. Most systematic disagreement is attributed to difficulties in defining the dendrite boundary in the analogues and much of the random disagreement to easily identified discrepancies between the analogue and the micrograph.

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“…Using a comparison between the microchemical analyses of the selected points the silicon segregations are detected in the laser-melted area as well as in the base material, as seen from Figure 3a, Table 4, spectra 4 and 6, and Figure 3b, site 5. Similar to cast iron, 22 the bluish colors represent a higher Si content in the laseraffected aluminum.…”

Section: Metallographic Analysesmentioning

confidence: 99%

Sensitivity of Weck’s reagent to the microstructure inhomogeneities of a pulse-laser-modified AlSi12CuNiMg alloy

Petrovič¹,

Šturm²

2018

Mater. Tehnol.

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In order to optimize laser cladding using pulsed-laser procedures, in particular to prevent failures of the cladding, a systematic ex-situ characterization can provide a lot of valuable information about the effects of the process parameters on the resulting microstructure and hardness. In this study, a TiC/TiB2 cladded layer was produced by laser scanning over a pre-placed TiC/TiB2/Al powder mixture on an aluminum alloy using a Nd:YAG pulsed laser. The increasing of the EEDV (effective energy density per volume) influences larger scattering of the cladded-layer thickness, whereas the decreasing of the EEDV influences the decrease of its surface roughness. The average hardness of the 0.1-mm-thick layer was 400±10 HV 0.3, which confirmed an improvement in the mechanical properties of the surface. The microstructures were investigated using FE-SEM/EDS and light microscopy. An additional color chemical etching using Weck's reagent at room temperature was performed. Using color etching, the laser-affected features, i.e., the penetration depth, the melt pool, its boundaries and various inhomogeneities, could be clearly distinguished. The sensitivity of the color etchant to the morphological and compositional differences was confirmed by FE-SEM/EDS analyses and microhardness measurements.

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Study of microstructure and silicon segregation in cast iron using color etching and electron microprobe analysis

Cited by 30 publications

References 4 publications

Size Distribution of Graphite Nodules in Hypereutectic Cast Irons of Varying Nodularity

Size Distribution of Graphite Nodules in Hypereutectic Cast Irons of Varying Nodularity

Quantification of Dendritic Austenite After Interrupted Solidification in a Hypoeutectic Lamellar Graphite Iron

Sensitivity of Weck’s reagent to the microstructure inhomogeneities of a pulse-laser-modified AlSi12CuNiMg alloy

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