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Grain Size Measurement using Ultrasonic Testing

model abstract : Properties of steel depend also on its internal structure. In practice, one can distinguish between primary structure (obtained during solidification) and secondary structure (being a result of the phase transition into the phase during hot working or heat treatment). The grain refinement degree obtained is assessed with microscopic examination. In this work an alternative method is proposed in the determination of the steel microstructure refinement degree. The method is based on the dependence between the high frequency sound attenuation coefficient and the average grain diameter. Sound in steel increases when the average steel grain diameter approximates the ultrasonic wave length, because of the scattering of waves on grain boundaries. Key words: steel; microstructure; ultrasonic wave INTRODUCTION The microstructure of steel is decisive for its chemical, physical and mechanical properties. Depending on the parameters characterising liquid metal as well as the parameters of the steel casting influencing the crystallisation process, the macrostructure of casts and ingots consist of three, two or only one crystallisation zone. In steel ingots, its most frequent by consist of three zones: chill, columnar and equiaxed grains. The structure of finished hot worked steel depends to a considerable extent on the primary structure of cast steel. Therefore, the knowledge of the microstructure of cast steel is very important on each stage of the steel products manufacturing also give metallography one section,literature survey ,proposed study, ultrasonic tests, method used as well as results and discussions as well as conclusions, references at least 10
model abstract : Properties of steel depend also on its internal structure. In practice, one can distinguish between primary structure (obtained during solidification) and secondary structure (being a result of the phase transition into the phase during hot working or heat treatment). The grain refinement degree obtained is assessed with microscopic examination.
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Assignment ID
28947
Discipline
CREATED ON
May 26, 2016
COMPLETED ON
May 27, 2016
Price
$40
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