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Cracking Behavior Of Ceramic Particles Reinforcedni-Base Alloys Composite Coating By Laser Cladding

Author

Listed:
  • WEIPING ZHANG

    (Department of Materials Engineering, Dalian University of Technology, Dalian 116023, P. R. China)

  • SHUO LIU

    (Department of Materials Engineering, Dalian University of Technology, Dalian 116023, P. R. China)

Abstract

In-situsynthesized TiB2particles reinforcedNi-base composite coatings with different compositions were fabricated on medium carbon steel using laser cladding. Cracking behavior in different coatings was studied by microanalysis. Results show that the coating quality is good with optimal laser parameters and coating compositions; whereas the cracks formed in the coating with high content of ceramic phases mainly include the following: the transcrystalline cracks in the bonding metal matrix, the high density cracks in the edge of the coating, micro-cracks on the interface of the matrix and the hardy ceramic phases and in the vicinity of the bonding interface in the heat-affected zone etc. Cracking behavior in the coating is mainly attributed to the thermal stress induced by the difference of the thermal expansion coefficient of the coating materials and the metal matrix, and the phase transformation stress plays an important role too.

Suggested Citation

  • Weiping Zhang & Shuo Liu, 2005. "Cracking Behavior Of Ceramic Particles Reinforcedni-Base Alloys Composite Coating By Laser Cladding," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 12(01), pages 7-12.
    • Handle: RePEc:wsi:srlxxx:v:12:y:2005:i:01:n:s0218625x05006755
    DOI: 10.1142/S0218625X05006755
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