Resumo O efeito do caminho de solidificação de um aço High Temperature Processing (HTP) API 5L X65 com 0,09 %Nb, 0,039%C e 0,54% Mn (percentagem em massa) na segregação, microestrutura e distribuição dos precipitados de Ti,Nb(C,N) foi estudado por microscopia ótica, eletrônica de varredura (MEV) e simulação computacional (ThermoCalc e DICTRA). Os resultados foram comparados com os de um aço microligado comercial com 0,04 %Nb, 0,09%C e 0,97 %Mn. Foi encontrado que o principal parâmetro que influencia no caminho de solidificação é o teor de C, o que está de acordo com a maior micro e macrossegregação observada no aço microligado comercial, em comparação ao aço HTP.
In this work we have used mechanical alloying to produce nanocrystalline Al 89 Fe 10 Zr 1 alloy powder. The effect of the milling time and the thermal stability of the product powder were evaluated by differential scanning calorimetry and X-ray diffraction. Scanning electron microscopy and transmission electron microscopy were also used for the microstructural characterisation of the powder. The mechanically alloyed powder was composed by a nanocrystalline supersaturated solid solution of α-Al, with average nanocrystals size of 15 nm. The following phases were formed during heating: Al 6 Fe, Al 13 Fe 4 and Al 3 Zr besides an unknown metastable phase. In the fully annealed alloy the phases observed were α-
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