Microstructure and Mechanical Properties of Laser-Directed Energy Deposition of 15-5PH Stainless Steel
This study reports the preparation of 15-5PH martensitic stainless steel via laser-directed energy deposition(L-DED)and systematically analyzes its microstructure and properties in different directions.The research results indicate that the microstructure of 15-5PH martensitic stainless steel fabricated via laser-directed energy deposition is primarily composed of martensitic and a minute amount of austenitic phases.The extremely rapid heating and cooling during the formation process result in columnar grains growing epitaxially along the deposition direction.The microstructures in different regions parallel to the scanning direction differ significantly,with the central region of the sample experiencing prolonged thermal accumulation,thus resulting in coarser microstructures compared with the microstructures in the top and bottom regions.The microstructural variations along different forming directions result in anisotropic mechanical properties,with tensile strengths of 1000 MPa and 1014 MPa,yield strengths of 756 MPa and 883 MPa,and elongations of 8.7%and 7.4%,along the deposition direction and the direction parallel to the scanning direction,respectively.
laser opticslaser-directed energy deposition15-5PH stainless steelmicrostructure evolutionmechanical property
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