The mechanical properties of an austenite-based Fe-Mn-Al-C lightweight steel were improved by co-precipitation of nanoscale Cu-rich andκ-carbide particles.The Fe-28Mn-9Al-0.8C-(0,3)Cu(wt.%)strips were near-rapidly so...The mechanical properties of an austenite-based Fe-Mn-Al-C lightweight steel were improved by co-precipitation of nanoscale Cu-rich andκ-carbide particles.The Fe-28Mn-9Al-0.8C-(0,3)Cu(wt.%)strips were near-rapidly solidified and annealed in the temperature range from 500℃to 700℃.The microstructure evolution and mechanical properties of the steel under different annealing processes were studied.Microstructural analysis reveals that nanoscaleκ-carbides and Cu-rich particles precipitate in the austenite and ferrite of the steel in this annealing temperature range.Co-precipitation of nanoscale Cu-rich particles andκ-carbides provides an obvious increment in the yield strength.At the annealing temperature of 600℃,both the yield strength and ultimate tensile strength of Fe-28Mn-9Al-0.8C-3Cu(wt.%)steel strip are the highest.The total elongation is 25%,which is obviously higher than that of Cu-free steel strips,for the addition of Cu reduces the large sizedκ-carbides precipitated along austenite/ferrite interfaces.When the annealing temperature rises to 700℃,the strength and ductility of the two steel strips deteriorate due to the formation of massive intergranularκ-carbides precipitated along austenite/ferrite interfaces.It can be concluded that a proper co-precipitation of Cu-rich particles andκ-carbides would improve the properties of austenite-based Fe-Mn-Al-C steel.展开更多
基金financially supported by the National Natural Science Foundation of China(No.51974184)the National MCF Energy R&D Program of China(No.2018YFE0306102)。
文摘The mechanical properties of an austenite-based Fe-Mn-Al-C lightweight steel were improved by co-precipitation of nanoscale Cu-rich andκ-carbide particles.The Fe-28Mn-9Al-0.8C-(0,3)Cu(wt.%)strips were near-rapidly solidified and annealed in the temperature range from 500℃to 700℃.The microstructure evolution and mechanical properties of the steel under different annealing processes were studied.Microstructural analysis reveals that nanoscaleκ-carbides and Cu-rich particles precipitate in the austenite and ferrite of the steel in this annealing temperature range.Co-precipitation of nanoscale Cu-rich particles andκ-carbides provides an obvious increment in the yield strength.At the annealing temperature of 600℃,both the yield strength and ultimate tensile strength of Fe-28Mn-9Al-0.8C-3Cu(wt.%)steel strip are the highest.The total elongation is 25%,which is obviously higher than that of Cu-free steel strips,for the addition of Cu reduces the large sizedκ-carbides precipitated along austenite/ferrite interfaces.When the annealing temperature rises to 700℃,the strength and ductility of the two steel strips deteriorate due to the formation of massive intergranularκ-carbides precipitated along austenite/ferrite interfaces.It can be concluded that a proper co-precipitation of Cu-rich particles andκ-carbides would improve the properties of austenite-based Fe-Mn-Al-C steel.
