Effect of electrolytic polishing quality on morphology characterization of precipitated phases in high nitrogen stainless steel by atomic force microscopy
The high nitrogen stainless steel 30Cr15Mo1N was investigated to study the effect of electrolytic polishing quality on the morphology characterization of precipitate phases by atomic force microscopy (AFM). The best electrolytic polishing parameters for AFM observation of precipitate phases were obtained. The samples with different surface polishing qualities were prepared by different polishing voltage and polishing time. The morphologies and surface roughness of precipitate phases were observed by AFM. The image pro software was used for quantitative analysis of precipitate phase. The results showed that the surface of prepared high nitrogen stainless steel was poor and uneven with high roughness and even a lot of holes under the following experimental conditions: in 6% perchlorate alcohol solution at room temperature; the polishing time was less than 20 s or more than 50 s; the electrolytic polishing voltage was less than 15 V or more than 30 V. The surface of high nitrogen stainless steel is poor and uneven, the roughness is large, and even there are a lot of holes, which is not conducive to obtaining a good surface quality. The poor polishing quality led to poor contrast of AFM images, which was not suitable for the observation and quantitative analysis. If the high nitrogen stainless steel samples were polished at 2430 V for 20 s, the precipitate phases sample for quantitative characterization by AFM could be obtained.#br#
1. Central Iron and Steel Research Institute, Beijing 100081, China;
2. Oxford Instrument Technology (Shanghai) Co., Ltd., Beijing 100089, China
Abstract：The high nitrogen stainless steel 30Cr15Mo1N was investigated to study the effect of electrolytic polishing quality on the morphology characterization of precipitate phases by atomic force microscopy (AFM). The best electrolytic polishing parameters for AFM observation of precipitate phases were obtained. The samples with different surface polishing qualities were prepared by different polishing voltage and polishing time. The morphologies and surface roughness of precipitate phases were observed by AFM. The image pro software was used for quantitative analysis of precipitate phase. The results showed that the surface of prepared high nitrogen stainless steel was poor and uneven with high roughness and even a lot of holes under the following experimental conditions: in 6% perchlorate alcohol solution at room temperature; the polishing time was less than 20 s or more than 50 s; the electrolytic polishing voltage was less than 15 V or more than 30 V. The surface of high nitrogen stainless steel is poor and uneven, the roughness is large, and even there are a lot of holes, which is not conducive to obtaining a good surface quality. The poor polishing quality led to poor contrast of AFM images, which was not suitable for the observation and quantitative analysis. If the high nitrogen stainless steel samples were polished at 2430 V for 20 s, the precipitate phases sample for quantitative characterization by AFM could be obtained.
2022, Vol. 40 
