Title of article :
Effect of aging on the microstructure and tensile properties of Fe–Ni–Mn–Cr maraging alloys
Author/Authors :
Hossein Nedjad، نويسنده , , S. and Meimandi، نويسنده , , S. and Mahmoudi، نويسنده , , A. and Abedi، نويسنده , , T. and Yazdani، نويسنده , , S. and Shirazi، نويسنده , , H. and Nili Ahmadabadi، نويسنده , , M.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2009
Pages :
6
From page :
182
To page :
187
Abstract :
Effect of aging on the microstructure and mechanical properties of 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 in Fe–10Ni–7Mn–6Cr (wt.%) and Fe–10Ni–7Mn–9Cr (wt.%) alloys at ambient temperature. The retained austenite exhibited mechanical instability during tensile loading at ambient temperature and transformed into martensite substantially, aiming at large tensile ductility. Age hardenability of the studied alloys decreased by increasing of retained austenite. In an Fe–10Ni–7Mn–6Cr (wt.%) alloy, transmission electron microscopy studies represented pronounced precipitation of a face-centered tetragonal (fct) θ-NiMn intermetallics in martensite and weak precipitation of a needle-shaped phase in retained austenite. After aging of the partially transformed alloy, yield strength increased moderately while tensile ductility decreased drastically. The ductility loss is mainly attributed to the premature intergranular fracture initiating within the aged martensite.
Keywords :
maraging steel , Intergranular embrittlement , Precipitation , martensite , Austenite
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Serial Year :
2009
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Record number :
2158981
Link To Document :
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