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In this study,the three-windows method,the jump-ratio method and the R-map method in energy-filtered transmission electron microscopy(EFTEM) have been applied to mapping carbon distribution in 35SiMn steel after a quenching-partitioning treatment.The carbon contamination is successfully suppressed by using EFTEM and plasma-cleaning TEM samples.Compared to the three-windows method and the jump-ratio method,the R-map method provides carbon distribution with less noises,and is insensitive to changes in sample thickness.We have demonstrated that the R-map method is a better way for carbon mapping in middle-carbon steel without the influence of carbon contamination.
In this study, the three-windows method, the jump-ratio method and the R-map method in energy-filtered transmission electron microscopy (EFTEM) have been applied to mapping carbon distribution in 35SiMn steel after a quenching-partitioning treatment.The carbon contamination is successfully suppressed by using EFTEM and plasma-cleaning TEM samples. Compared to the three-windows method and the jump-ratio method, the R-map method provides carbon distribution with less noises, and is insensitive to changes in sample thickness. have demonstrated that the R-map method is a better way for carbon mapping in middle-carbon steel without the influence of carbon contamination.