EBSD analysis of spark plasma sintered SS316-B4C composite

The Electron Backscatter Diffraction (EBSD) method has been characterized as a potential tool for analysing the microstructural changes that occur during the sintering processes and it possesses the ability to depict misorientation diagrams, pole figures and grain size distribution. The present work focuses on observing the microstructure evolution of the prepared 316 stainless steel with 10 wt% of B4C samples sintered at the temperatures of 800, 900, and 1000 degrees C using the Spark Plasma Sintering (SPS) method. The samples are in the equiaxed form of recrystallized grains and they are elongated. Further, the samples sintered at 900 degrees C are equally recrystallized compared to other samples sintered at 800 and 1000 degrees C, where the microstructure is partially recrystallized with a high fraction. The result is explicable, by increasing the carbon content it causes the reduction of grain boundaries as well as decreases the migration rate of twin boundary generation. Hence, twin character loss is accelerated by the increase of carbon content with low-angle boundaries, and because of the typical drag effect, it has been discovered that the dynamically recrystallized grain size is reduced. The partitioning of these microstructures is done to differentiate the sintered sample and the recrystallized grains, based on the Grain Orientation Spread (GOS) map. The experimental investigation has suggested that the samples sintered at 900 degrees C has a more favourable microstructure analysis than the other samples sintered at 800 degrees C and 1000 degrees C, respectively.

Automated summary

The present study focuses on the microstructural evolution of 316 stainless steel with 10 wt% of B4C samples sintered at temperatures of 800, 900, and 1000 degrees C using the Spark Plasma Sintering method. The results show that the samples sintered at 900 degrees C have a higher degree of recrystallization compared to those sintered at 800 and 1000 degrees C. This can be explained by the increase in carbon content, which reduces grain boundaries and decreases the migration rate of twin boundary generation. The experimental investigation suggests that the samples sintered at 900 degrees C have a more favorable microstructure analysis.