Microstructural Characteristics of Laser-Clad AISI P20 Tool Steel

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Proceedings titleSurface Engineering Coatings and Heat Treatments 2002
Conference1st ASM International Surface Engineering and the 13th IFHTSE Congress, October 7-10, Columbus Ohio
Pages198205; # of pages: 8
Subjectlaser cladding; P20 tool steel; microstructure
AbstractLaser cladding of P20 powder on AISI P20 tool steel substrate has been investigated for potential mold or die repair applications. The process was conducted using a 3 kW CO2 laser in continuous wave (CW) mode to melt the moving substrate while P20 powder was simultaneously fed into the molten pool. The process can accurately deposit material at desired locations with a relatively low heat input. A dense and crack-free clad layer was obtained with an excellent metallurgical bonding with the substrate. This study demonstrates that P20 powder can be deposited on P20 tool steel substrate without any pre-heating. The P20 clad layer has a higher hardness as compared to the P20 substrate. The microstructural morphology of as -clad P20 shows predominant martensite phase along with refined dendrites due to process-induced fast cooling. Moreover, the residual stress measurements indicate the presence of compressive residual stresses on the surface of the P20 clad.
Publication date
AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedYes
NPARC number21272521
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Record identifier49f64de6-0052-42eb-a0f8-4eb4665c778a
Record created2014-12-01
Record modified2016-05-09
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