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The precipitation of AlN is investigated in the austenite region of ultra low carbon steel. The evolution of the size and the morphology of AlN precipitates are studied by transmission electron microscopy (TEM) after isothermal annealing for different times at temperatures of 950 °C and 1050 °C. Various different morphologies are observed, including cuboids, large plates as well as irregular structures. In addition to the experimental analysis, thermo‐kinetic simulations are carried out with the software package MatCalc. The numerically calculated evolution of the mean radii as well as the time‐temperature‐precipitation (TTP) diagram for AlN precipitation in the present alloy show good agreement with experiment.
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Radis et al. (2011) studied this question.
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