8,440 research outputs found
Sinter-hardening of P/M steels: a numerical approach and relationships with microstructural and mechanical properties
No full text
Mechanical characterization of metals by small sampling size
No full textClassical plasticity models permit to simulate accurately the macroscopic response of several metals. This ability supports the development of indirect material characterization methodologies based on non-destructive testing, potentially applied for the fast integrity assessment of structural components in operating conditions. In this context, reducing the sampling size mitigates the invasiveness of the experiments and improves the manageability of portable equipment, although the representativeness of the information collected from small material volumes may become an issue. This contribution focuses on the equivalence between the mechanical properties that can be inferred from metal sampling of typical dimensions of hundreds or dozens microns, corresponding to indentation tests carried out at maximum load differing by one order of magnitude. This topic is addressed by the comparison of the results gathered from experimental and numerical analyses of pipeline steel
Correlazione tra analisi frattografica e tenacità di acciai sinterizzati da polveri diffusion-bonded
No full textOn the non-isothermal precipitation of copper-rich phase in 17-4 PH stainless steel using dilatometric techniques
No full textThe 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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