| Microstructure and Fractural Morphology of Cobalt-based Alloy Laser Cladding |
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| 引用本文： | 陈浩. Microstructure and Fractural Morphology of Cobalt-based Alloy Laser Cladding[J]. 武汉理工大学学报(材料科学英文版), 2003, 18(3): 30-32. DOI: 10.1007/BF02838452 |
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| 作者姓名： | 陈浩 |
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| 作者单位： | School of |
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| 基金项目： | theNationalNaturalScienceFoundationofChina(No .5 0 10 10 0 9) |
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| 摘 要： | 1 IntroductionCobalt basedalloyiswidelyusedingasturbineair craftenginesandvalvespumpshaftsofpressurevessels[1,2 ] ,duetoitshighflowstressesandoutstandingresistancetooxidationandwearuptotemperaturesclosingtoitsmeltingpoint.Thehighsolidificationrateoflasercladdingtendstoresultinfinemicrostructures ,non equi libriumphasesandsupersaturatedsolidsolutions ,whichleadtohighhardnessandwearandcorrosionresi stance[3 -5] .However,crackingfrequentlyappearsinthelasercladdinglayerwhichlimitstheuseofthissurf…
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| 收稿时间： | 2002-04-10 |
| 修稿时间： | 2003-04-03 |
Microstructure and fractural morphology of cobalt-based alloy laser cladding |
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| Chen Hao,Pan Chun-xu. Microstructure and fractural morphology of cobalt-based alloy laser cladding[J]. Journal of Wuhan University of Technology. Materials Science Edition, 2003, 18(3): 30-32. DOI: 10.1007/BF02838452 |
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| Authors: | Chen Hao Pan Chun-xu |
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| Affiliation: | Germany) 3) Wuhan University |
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| Abstract: | The solidification features,micro segregation,and fracture characteristics of cobalt based alloy on the substrate of 20CrMo steel by laser cladding were studied by using electron microscopy.Experimental results show that the fine columnar grains and cellular dendrite grains are obtained which are perpendicular to the coating/substrate interface;the primary arms are straight while the side branches are degenerated;the microstructure consists of primary face centered cubic (fcc) Co dendrites and a network of Cr enriched eutectic M23C6 (M=Cr,W,Fe) carbides;the micro segregation is severe for the rapid heating and cooling of laser cladding;the typical brittle intergranular fracture occurs in cobalt based laser cladding layer. |
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| Keywords: | laser cladding Cobalt based alloy solidification microstructure micro segregation fracture |
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