Effect of aging on the microstructure and tensile properties of Fe–Ni–Mn–Cr maraging alloys

摘要: Effect of aging on the microstructure and mechanical properties chromium-containing Fe–Ni–Mn maraging alloys was studied. An Fe–10Ni–7Mn–2Cr (wt.%) alloy exhibited strong age hardenability but suffered from premature intergranular brittleness after aging. Further chromium addition resulted in partial austenite retention Fe–10Ni–7Mn–6Cr Fe–10Ni–7Mn–9Cr at ambient temperature. The retained instability during tensile loading temperature transformed into martensite substantially, aiming large ductility. Age studied decreased by increasing austenite. In an alloy, transmission electron microscopy studies represented pronounced precipitation a facecentered tetragonal (fct) � -NiMn intermetallics weak needle-shaped phase After partially yield strength increased moderately while ductility drastically. loss is mainly attributed to fracture initiating within aged martensite.