首页|Effect of Cu content on the precipitation behavior of Cu-rich and NiAl phases in steel
Effect of Cu content on the precipitation behavior of Cu-rich and NiAl phases in steel
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NSTL
Elsevier
? 2022The nanoscale precipitation and the mechanical properties of the two CuNiAl-containing steels with different Cu contents aged at 500 °C were investigated in this study. Results of mechanical property indicated that the co-precipitation of Cu-rich and NiAl phases during aging contributed to the precipitation strengthening effects. The influence of Cu content on the evolution of precipitates was studied by atom probe tomography (APT). The results demonstrated that the increasing of Cu content enhanced the number density of precipitates and accelerated the precipitation process. The two steels showed two kinds of precipitation sequences on account of different Cu contents. The steel 1 with low Cu content exhibited a precipitation sequence of “supersaturated solid solution → NiAl → NiAl + Cu”, while the steel 2 with high Cu content presented the process of “supersaturated solid solution → Cu → Cu + NiAl”. After further aging, the precipitates of both steels were transformed into Cu/NiAl co-precipitates without isolated Cu-rich phases and isolated NiAl phases.
Atom probe tomographyCu-rich phaseCuNiAl-containing steelNiAl phasePrecipitation strengthening
Shen Q.、Huang D.、Lu Q.、Li F.、Liu W.
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School of Mechanical and Automotive Engineering Shanghai University of Engineering Science
School of Materials Engineering Shanghai University of Engineering Science
Institute of Materials School of Materials Science and Engineering Shanghai University
NSTL
Elsevier
