The kinetics of the precipitation of copper-rich
phase in 17-4 PH stainless steel was studied in this paper
by non-isothermal dilatometric experiments. The dilatometric
curve was analyzed and the conversion degree of the
precipitates was associated with the area under the derivative
curve of the thermal expansion as a function of
temperature. The apparent activation energy associated
with the formation of the precipitates was calculated and
the obtained results were compared with the data calculated
from the isothermal dilatometric tests presented in a previous
paper. The data well agree, so confirming that nonisothermal
dilatometry can be considered a powerful
method to study the precipitation kinetics of PH stainless
steels. Finally, the conversion degree for any isothermal
treatment was calculated starting from the parameters
obtained by non-isothermal dilatometric tests and compared
with the conversion degree calculated from the
hardness values during heat treatments
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