吉林大学学报(工学版) ›› 2004, Vol. ›› Issue (3): 392-396.

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Microstructure of powder metallurgy material surface layer modified by laser cladding nano-Al2O3

LIU Yan1, YU Sirong2, REN Luquan1   

  1. 1. Key Laboratory for Terrain-Machine Bionics Engineering, Ministry of Education, of Education, Jilin University, Changchun 130022, China;
    2. College of Materials Science and Engineering, Jilin University, Changchun 130022, China
  • Received:2003-12-24 Online:2004-07-01

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Abstract: The nano-Al2O3 and the laser cladding were chosen respectively to serve as the surface modification material and processing technology for the powder metallurgy pieces. The solidification process of the laser cladding layer was investigated and the microstructure of the modification layer was observed by means of the metallograph and SEM. The factors affecting the formation of the different structures of the modification layer were studied. The observed microstucture can be divided into 3 zones, i.e., the cladding zone, the transition zone, and the base body zone, their densities decrease gradually from the cladding zone to the base body. The microstructure of the laser cladding surface is affected by the composition and the content of the coating, processing parameters and the shape factor G/υ（temperature gradient/solidification rate） which itself is decided by the processing parameters. When the sizes of the rectangular laser spot are 15 mm×2 mm,the optimal power is 2.5 kW, and the optimal scanning speed is 90 mm/min.

Key words: material surface and interface, process of laser cladding, powder metallurgy, nano-Al2O3, surface modification, microstructure

CLC Number: 

  • TG174.4
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