Title: Microstructure and fatigue properties of aviation aluminum alloy LY12CZ repaired by laser melt casting
Abstract:Corrosion damaged aluminum alloy(LY12CZ) was repaired by laser melt casting with Al based rare-earth alloy powder.The microstructure of melt casting zone was investigated,and comparison test of fatigu...Corrosion damaged aluminum alloy(LY12CZ) was repaired by laser melt casting with Al based rare-earth alloy powder.The microstructure of melt casting zone was investigated,and comparison test of fatigue life was carried out between repaired specimens and no-damage specimens.It is found that fine equiaxed crystals distribute in the casting layer and the crystal size is about 3-4 μm.The columnar crystals,axial direction size of which reaches 30-40 μm,exist near the substrate with its crystallographic axis perpendicular to the interface.The fatigue life of specimens repaired by laser melt casting is much shorter than that of no-damage specimens,due to the origin of crack resulting from flaws in the casting layer;the columnar grains in the bottom of casting zone are easy to crack under the tensile stress;the residual stress after melt casting accelerates the initiation and growth of crack.Read More
Publication Year: 2011
Publication Date: 2011-01-01
Language: en
Type: article
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Cited By Count: 1
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