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Spring'17 release of ME-databases

A complex heat treatment leads to a multimodal distribution of TiN precipitates in microalloyed steel. The figure below shows a Scanning Transmission Electron Microscopy (STEM) image with mass contrast (HAADF; the heavier, the brighter) of these particles. In this particular case the precipitates are extracted from the Fe matrix onto a thin carbon film (replica). Using this technique we are able to analyze particles down to several nanometers in size without disturbing contribution of the Fe matrix. Fig. shows three size populations of TiN precipitates. The chemical compositions of the nanoparticles were estimated using Energy Dispersive X-Ray Spectroscopy (EDX) and Electron Energy Loss Spectroscopy (EELS). The measurement of the sizes, chemical compositions and frequency of each population allows a better understanding of nitride precipitation and optimizing of the heat treatment.


STEM HAADF image of TiN precipitates in microalloyed steel (carbon extraction replica).