High Power Laser Powder Deposition Repair of AISI 4340 Steel in Aircraft Applications |
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| Authors: | Mohammed Reza D Janardhana Madabhushi Brandt Milan Clark Graham |
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| Affiliation: | School of Aerospace,Mechanical,and Manufacturing Engineering,RMIT University,Bundoora 3083,Victoria,Australia;Aircraft Structural Integrity Section,Directorate General Technical Airworthiness,RAAF,Laverton 3027,Victoria,Australia |
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| Abstract: | High power laser powder deposition (LPD) has been used to investigate the potential of repairing damaged aero-grade high strength steel.Metallurgical analysis was performed to analyze the integrity of the clad layer.A 4kW fiber laser was used to deposit two separate alloys (AISI 4340 and AISI 420 stainless steel) on an AISI 4340 steel substrate and metallurgical analysis was performed to analyze the integrity of the clad layer.No microcracks was observed on the clads,but porosity and high dilution was observed on most clads.However,microstructural analysis showed a crack and porosity free clad layer with low dilution can be achieved for some laser conditions. |
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| Keywords: | laser powder deposition high strength steel fiber laser microstructure hardness |
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