Mn element solid9/3/2023 ![]() ![]() Previous works have mainly focused on the precipitation and growth behavior of Cu and NiAl nanoparticles and their effects on the mechanical properties of Fe-based alloys. Among the various types of nanoprecipitates, ultrafine and high-density Cu and NiAl nanoprecipitates constitute two classes of effective strengthening phases for the manufacturing of new low-carbon steels with high strength, high ductility, and good weldability. Obviously, the type, number density, size, and spatial distribution of the precipitates, and the interaction of the dislocations with them, decide the strengthening degree in the steels. developed a new 1.5 GPa TRIP-maraging steel with nanoscale Ni 3(Ti, Al)-type precipitates. found that the precipitation strengthening of nano-sized κ-carbides can effectively increase the yield strength of high-Mn lightweight steel by ~480 MPa and then obtained an outstanding combination of properties, including a tensile strength of 1125 MPa and ~41% total elongation. developed a new maraging stainless steel-hardening technique by using MC carbides and Ni 3Ti intermetallic and Cu particles, and they obtained an ultrahigh tensile strength of ~1.6 GPa. Nanoprecipitation strengthening has been recognized as one of the most effective methods for enhancing the strength of steels. High-performance structural steels with high strength, toughness, and ductility are essential for saving energy and enhancing engineering reliability, thus resulting in sustainable economic development. Furthermore, larger Cu/NiAl nanoparticles can significantly improve the yield strength of martensitic steel through precipitation-strengthening mechanisms. However, 6 wt.% Mn doping can obviously increase the mean size of the Cu/NiAl nanoparticles by enhancing the chemical driving force of the Mn partitioning on the NiAl nanoparticles, which differs from the refining effect on the nanoparticles in 3 wt.% Mn-doped steels. The steel is composed of α’-martensite and slightly equiaxed α-ferrite together with a high proportion (~62.3%) of low-angle grain boundaries, and 6 wt.% Mn doping and the aging treatment have an effect on the matrix’s microstructure. The 6 wt.% Mn-doped steel exhibits a yield strength of ~1.83 GPa and an elongation-to-failure of ~7% under peak aging, and the ~853 MPa of precipitation strengthening is much higher than that observed in the 1.5 wt.% and 3 wt.% Mn-doped steels. The microstructure and mechanical properties of 6 wt.% Mn-doped martensitic steel have been investigated through a combination of electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), and small-angle neutron scattering (SANS). ![]()
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