1.Introduction With the upgrading of major equipment,the mechanical prop-erty requirements for structural materials are increasingly high.The maraging steel or maraging stainless steel has long repre-sented the highes...1.Introduction With the upgrading of major equipment,the mechanical prop-erty requirements for structural materials are increasingly high.The maraging steel or maraging stainless steel has long repre-sented the highest strength alloy to be developed as reported in recent researches[1-8].The tensile strength of this kind of alloy is usually around 2.0 GPa.The yield strength of a maraging steel re-cently fabricated by laser powder bed fusion can reach as high as about 2.4 GPa,but it is unfortunate that the elongation is merely about 1%[9].So it seems that 2.0 GPa yield strength is an upper limitation for this kind of alloy.To break through this limitation,it is of significance to establish a new composition design strat-egy.For instance,recent work[10]reported a medium Mn steel doped with Al and V elements,which exhibits an ultra-high yield strength of 2.21 GPa with 15%uniform elongation after thermo-mechanical processing.In another aspect,the design using multi-ple principal elements and additional elements to form a high en-tropy alloy(HEA)should be a very promising pathway.展开更多
基金National Natural Science Foundation of China(No.51371121).
文摘1.Introduction With the upgrading of major equipment,the mechanical prop-erty requirements for structural materials are increasingly high.The maraging steel or maraging stainless steel has long repre-sented the highest strength alloy to be developed as reported in recent researches[1-8].The tensile strength of this kind of alloy is usually around 2.0 GPa.The yield strength of a maraging steel re-cently fabricated by laser powder bed fusion can reach as high as about 2.4 GPa,but it is unfortunate that the elongation is merely about 1%[9].So it seems that 2.0 GPa yield strength is an upper limitation for this kind of alloy.To break through this limitation,it is of significance to establish a new composition design strat-egy.For instance,recent work[10]reported a medium Mn steel doped with Al and V elements,which exhibits an ultra-high yield strength of 2.21 GPa with 15%uniform elongation after thermo-mechanical processing.In another aspect,the design using multi-ple principal elements and additional elements to form a high en-tropy alloy(HEA)should be a very promising pathway.
