In this study, the effect of cooling rate and heat treatment on the microstructural and mechanical characteristics such as microhardness of low-carbon microalloyed steel was investigated by means of optical microscopy and Vickers hardness tests. The cooling rates were controlled by introducing air-cooling, furnace-cooling, water-quenching and liquid nitrogen quenching. The obtained results showed that the difference of cooling rates and the heat treatments significantly affect the microstructure and mechanical properties of steels. These tendencies were dominant in liquid nitrogen cooled for 1073 K at 4 h and 1273 K heat treatment processes.

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In this paper, the radiation shielding properties of borided Fe-Ni binary alloys (Ni-60 wt.% and Ni-80 wt.%) as a function of boronizing parameters (time and temperature) have been investigated by using the fuzzy logic model. For this purpose, the linear attenuation coefficients of borided samples were calculated and fuzzy logic approach was applied to these values. The results showed that fuzzy logic approach can be used to predict the radiation shielding properties of borided Fe-Ni alloys for untested conditions.

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