MICROSTRUCTURE AND FORMATION MECHANISM OF LASER  CLAD  Ni60ACOATING

Abstract

Abstract: The microstructure and formation mechanism of laser clad Ni60 Acoating were studied by meansof XRD, SEM, TEMand EDAXetc. Theresultsshow thatthe microstructureofthe coatingiscontrolled bytheratiooftemperature gradient Gand solidification speed υ( G/υ)atthesolid liquidinterface. Attheinterfaceof molten pool/substrate, G/υisquitelarge,and Ni basedsolid solutionsgrowingintheform oflow speed planar grain boundary form abonding belt. With the advancement of the solid liquid interface, G/υdecreases, and a bonding zone mainly composed ofcomplex cellulareutecticsof Ni+ M23( CB)6 and Ni+ Ni3Bisformed when G/υisstilllargeenough. Further decrease willlead to a clad layerthat exhibitscellular and dendritic Ni basedsolidsolutions,dendriticor discontinuousnetwork M7( CB)3 and complex eutectics( Ni+ M23( CB)6 and Ni+ Ni3 B) between them .

Key words: microstructure, formation mechanism , lasercladding, Ni60 Acoating

C.Z. Chen1,2) , T.Q. Lei2) , D.W. Cui1)and J.H. Yu1) 1) College of MaterialScience and Technology ,Shandong University of Technology,Jinan 250061 , China2) College of MaterialScience and Technology , Harbin Institute of Technology ,Harbin 150001 ,China. MICROSTRUCTURE AND FORMATION MECHANISM OF LASER CLAD Ni60ACOATING[J]. Acta Metallurgica Sinica (English Letters), 1999, 12(4): 649-652.

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MICROSTRUCTURE AND FORMATION MECHANISM OF LASER CLAD Ni60ACOATING

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