简介：Biomimeticsurfaceisaneffectivewaystopromotetheperformancegradeandappliedrangeofmaterialswithoutalteringtheirsubstrate.Manyimprovedpropertiessuchasresistingfatigue,enduringwear,etc,havebeenachievedbyapplyingbiomimeticmorphologyorstructuretosomeengineeringmaterialsurfaces.Inthispaper,aimingtorevealtherelationshipbetweenthermalcrackingbehaviorandmechanicalpropertiesofengineeringmaterialswithbiomimeticsurface,biomimeticspecimenswerefabricatedusinglasertechniquebyimitatingtheheterogeneousstructureonthesurfaceofplantleaves.TheeffectofthermalfatiguecyclingonthetensilepropertiesofH13diesteelspecimenswithdifferentsurfaces(severaltypesofbiomimeticsurfacesandasmoothsurface)wascomparedandinvestigated.Asaresult,duetothecouplingeffectsofthemorphologicalfeaturesonthesurfaceandthemicrostructurecharacteristicswithinunitzone,thesespecimenswithbiomimeticsurfaceexhibitremarkablyenhancedUltimateTensileStrength(UTS)and0.2%YieldStrength(YS)comparedwithreferencespecimenswhilecorrespondingductilityremainslargelyunaffectedevenheightened,whetherthethermalfatigueloadsornot.Therelativemechanismsleadingtotheseimprovementshavebeendiscussed.

简介：Lasermultipleprocessing,i.e.lasersurfacetexturingandthenLaserShockProcessing(LSP),isanewsurfaceprocessingtechnologyforthepreparationofbionicnon-smoothsurfaces.Basedonengineeringbionics,samplesofbionicnon-smoothsurfacesofstainlesssteel0Crl8Ni9weremanufacturedintheformofreseaustructurebylasermultipleprocessing.Themechanicalproperties(includingmicrohardness,residualstress,surfaceroughness)andmicrostructureofthesamplestreatedbylasermultipleprocessingwerecomparedwiththoseofthesampleswithoutLSPTheresultsshowthatthemechanicalpropertiesofthesesamplesbylasermultipleprocessingwereclearlyimprovedincomparisonwiththoseofthesampleswithoutLSPThemechanismsunderlyingtheimprovedsurfacemicrohardnessandsurfaceresidualstresswereanalyzed,andtherelationsbetweenhardness,comnressiveresidualstressandroughnesswerealsopresented.