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1、MaterialsScienceandEngineeringA392(2005)348358CavitationerosionresistanceofAISI316Lstainlesssteellasersurface-modifiedwithNiTiK.Y.Chiua,F.T.Chenga,∗,H.C.ManbaDepartmentofAppliedPhysics,TheHongKongPolytechnicUniversity,HungHom,Kowloon,HongKong,ChinabDe
2、partmentofIndustrialandSystemsEngineering,TheHongKongPolytechnicUniversity,HungHom,Kowloon,HongKong,ChinaReceived15June2004;accepted25September2004AbstractThepresentstudyispartofaprojectonthesurfacemodificationofAISI316stainlesssteelusingvariousformso
3、fNiTiforenhancingcavitationerosionresistance.Inthisstudy,NiTipowderwaspreplacedontheAISI316Lsubstrateandmeltedwithahigh-powerCWNd:YAGlaser.Withappropriatelaserprocessingparameters,analloyedlayerofafewhundredmicrometersthickwasformedandfusionbondedtot
4、hesubstratewithouttheformationofabrittleinterface.EDSanalysisshowedthatthelayercontainedFeasthemajorconstituentelementwhiletheXRDpatternsofthesurfaceshowedanausteniticstructure,similartothatof316stainlesssteel.Thecavitationerosionresistanceofthemodifi
5、edlayer(316-NiTi-Laser)couldreachabout29timesthatofAISI316Lstainlesssteel.Theimprovementcouldbeattributedtoamuchhighersurfacehardnessandelasticityasrevealedbyinstrumentednanoindentationtests.Amongvarioustypesofsamples,thecavitationerosionresistancewa
6、srankedindescendingorderas:NiTiplate>316-NiTi-Laser>316-NiTi-TIG>AISI316L,where316-NiTi-TIGstandsforsamplessurfacedwiththetungsteninertgas(TIG)processusingNiTiwire.Thoughthelaser-surfacedsamplesandtheTIG-surfacedsampleshadsimilarindentationproperties
7、,theformerexhibitedahighererosionresistancemainlybecauseofamorehomogeneousalloyedlayerwithmuchlessdefects.Inboththelaser-surfacedandTIG-surfacedsamples,thesuperelasticbehaviortypicalofausteniticNiTiwasonlypartiallyretainedandthesuperiorcavitationeros
8、ionresistancewasthusstillnotfullyattained.©2004ElsevierB.V.Allrightsreserved.Keywords:Lasersurfacemodification;Cavitationerosion;AISI316Lstainlesssteel;NiTi;Hardness1.Introductionthedegradationprocessbeingknownascavitationerosion[3].Theintensityofcavi
