Kohne Thomas, Dahlström Alexander, Winkelmann Aimo, Hedström Peter, Borgenstam Annika
Department of Materials Science and Engineering, KTH Royal Institute of Technology, 10044 Stockholm, Sweden.
Academic Centre for Materials and Nanotechnology (ACMiN), AGH University of Science and Technology, 30059 Kraków, Poland.
Materials (Basel). 2022 Sep 25;15(19):6653. doi: 10.3390/ma15196653.
A novel approach for the correlation of local martensite tetragonality determined by electron backscatter diffraction and carbon distribution by atom probe tomography (APT) is presented. The two methods are correlated by site-specific sample preparation for APT based on the local tetragonality. This approach is used to investigate the local carbon distribution in high carbon steel with varying local martensite tetragonality. Regions with low tetragonality show clear agglomeration of carbon based on statistical nearest neighbour (NN) analysis, while regions with high tetragonality show only small elongated agglomerations of carbon and no significant clustering using NN analysis. The APT average bulk carbon content shows no quantitative difference between regions with low and high tetragonality, indicating that no significant long-range diffusion of carbon has taken place.
本文提出了一种新方法，用于关联通过电子背散射衍射测定的局部马氏体四方度与通过原子探针断层扫描（APT）得到的碳分布。基于局部四方度，通过特定位置的APT样品制备将这两种方法关联起来。该方法用于研究具有不同局部马氏体四方度的高碳钢中的局部碳分布。基于统计最近邻（NN）分析，四方度低的区域显示出明显的碳团聚，而四方度高的区域仅显示出小的细长碳团聚，使用NN分析没有明显的聚类。APT平均体碳含量在四方度低和高的区域之间没有显示出定量差异，表明没有发生明显的碳长程扩散。
