Experimental Study of Residual Stresses in Laser Clad AISI P20 Tool Steel on Pre-Hardened Wrought P20 Substrate

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DOIResolve DOI: http://doi.org/10.1016/j.msea.2010.07.098
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TypeArticle
Journal titleMaterials Science and Engineering A
Volume527
Issue27/28
Pages72657273; # of pages: 9
SubjectLaser cladding; AISI P20 tool steel; Residual stress; Neutron diffraction; Hole-drilling method; Tooling repair
AbstractLaser cladding is to deposit desired material onto the surface of a base material (or substrate) with relatively low heat input to form a metallurgically sound and dense clad. This process has been successfully applied for repairing damaged high-value tooling to reduce their through-life cost. However, laser cladding, which needs to melt a small amount of a substrate along with cladding material, inevitably introduces residual stresses in both clad and substrate. The tensile residual stresses in the clad could adversely affect mechanical performance of the substrate being deposited. This paper presents an experimental study on process-induced residual stresses in laser clad AISI P20 tool steel onto pre-hardened wrought P20 base material and the correlation with microstructures using hole-drilling and neutron diffraction methods. Combined with X-ray diffraction and scanning electron microscopic analyses, the roles of solid-state phase transformations in the clad and heat-affected zone (HAZ) of the substrate during cladding and post-cladding heat treatments on the development and controllability of residual stresses in the P20 clad have been investigated, and the results could be beneficial to more effective repair of damaged plastic injection molds made by P20 tool steel.
Publication date
LanguageEnglish
AffiliationNRC Industrial Materials Institute; NRC Steacie Institute for Molecular Sciences; National Research Council Canada
Peer reviewedYes
NPARC number17697680
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Record identifierba489940-6f79-4a74-8a01-981bfd5a4571
Record created2011-04-07
Record modified2016-05-09
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