T10鋼激光熔覆Ni-WC合金組織與性能研究.pdf

1、南昌大學碩士學位論文T10鋼激光熔覆NiWC合金組織與性能研究姓名：陳寧申請學位級別：碩士專業(yè)：機械工程指導教師：黃興元廖鐘亮20091224Abs仃actABSTRACTLasercladdingisoneofthesurfacetreatmentsItcallstrengthenthesurfacehardness、weal“resistanceandcorrosionresistanceofmaterialsandparts，th

2、inninggrainandmicrostructure，improvesurfacepropertiesofmaterialsT10steel，afrequentlyusedmaterialinmouldindustryisstudiedprincipallyinthispaperandtheemphasisisputontheprocessoflasercladdingNialloyonthemouldsteelandthemicr

3、ostructure，thecrack，theoverlappingofcladdinglayers，aswellasthecapabilityandmicrostructureofNialloywithWClaserlayersTheexperimentresultshowsthattherearethreelayers：thecoatingregion，bondedzoneandheataffectedzoneUnderthepro

4、perlasercladdingparameterniceunionresistancecladdinglayerCanbeobtainedThemicrostructureofcladdinglayeriscomposedbyclavoidformandgrainycellularcrystals，duetothelaserspeedinesscalefactionandcoolingInthecladdingprocess，thes

5、peedofcalefactionandcoolingisdifferent，SOthedistributingofhardnessisasymmetrytherigiditycanbeupto8726HV01inthesecondarysurface，thewearablepropertiesisalsothehighestAftertheaddingofWe，thehardnessoflaserlayerhaslittlechang

6、ing，butthewearablepropertieshadbeenenhancedgreatlywiththeenhancingoffrangibilitySOthechoosingofcladdingparameterisneededTheinfluenceoflaserpowerscanningspeedandofffocustothecladdinglayer’Shardness，surfacewearableproperti

7、esandmicrostructurewerestudiedbytheuseofscanningelectronmicroscope，microhardnesstestingtechniques，wearablepropertiestestingandtheorthogonalexperimentanalysisandSOonTheresultshowsthatthemicrohardnessofthecladdinglayerisin

8、creasedfirstlyandthethendroped，andSOisthewearablepropertiesofmaterialThisisresultedbythedifferenceofenergydensitywhichbringtothedifferentsizeofcrystalgranuleAsthescanningspeed—becomingaugment，thecladinglayer’Shardnessand