" 洪永昌1，夏正文2 (1．安徽工业大学材料科学与工程学院，安徽马鞍山243002；2．浙江久力集团股份有限公司，浙江湖州313012)
StudyonmicrostructureandthermalfatigueresistanceoflaserremeltingCo-basedalloyhardfacedlayers HONGYong-chang1，XIAZheng-wen2 (1．CollegeofMaterialsScienceandEngineering，AnhuiUniversityofTechnology，Ma?anshan243002，China；2．ZhejiangJiuliGroupCo．，Ltd．，Huzhou313012，China) Abstract：Bymeansofopticalmicroscope?OP?，scanningelectronmicroscope?SEM?andX-raydiffractioninstrument?XRD?，remeltinghardfacedlayersofCo?basedalloywhichweremadewithdifferentparametersoflaserremeltingwerestudied．Microstructureandthermalfatigueresistanceofthewerealsotested．Afterlaserremelting，itshowedthatmicrostructureturnedtobefine，uniformandcompact．Anditwascomposedofprimaryphase?γ-Co?andeutecticmicrostructure?γ-Co Cr23C6?．Comparedwiththeoriginalhardfacedlayers，thermalfatigueresistanceoftheremeltinghardfacedlayerswithdifferentlaserparameterswasallimproved．Andatthetemperatureof700℃，thermalfatigueresistanceoftheremeltinghardfacedlayerswasbetterthanthatatthetemperatureof900℃．Itwasbestwhenlaserpowerwas2．5kW，scanningspeedwas4mm·s-1atthetemperatureof700℃． |
 |
||||
|
||||
|
