On the non-isothermal precipitation of copper-rich phase in 17-4 PH stainless steel using dilatometric techniques |
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Authors: | B Rivolta R Gerosa |
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Institution: | (1) Dipartimento di Meccanica, Politecnico di Milano, Via La Masa 34, 20156 Milan, Italy |
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Abstract: | 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 non-isothermal
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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