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Acta Metall Sin  2009, Vol. 45 Issue (9): 1091-1098    DOI:
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MORPHOLOGIC CHARACTERISTICS OF IN SITU SYNTHESIZED CARBIDE PARTICLES IN LASER CLADDED Fe-BASED COMPOSITE COATINGS
WU Chaofeng;  MA Mingxing;  WU Aiping; LIU Wenjin; ZHONG Minlin; ZHANG Weiming; ZHANG Hongjun
1) Key Laboratory for Advanced Materials Processing Technology; Ministry of Education; Department of Mechanical Engineering; Tsinghua University; Beijing 100084
2) Beijing Institute of Opto--Electronic Technology; Beijing 100010
Cite this article: 

WU Chaofeng MA Mingxing WU Aiping LIU Wenjin ZHONG Minlin ZHANG Weiming ZHANG Hongjun. MORPHOLOGIC CHARACTERISTICS OF IN SITU SYNTHESIZED CARBIDE PARTICLES IN LASER CLADDED Fe-BASED COMPOSITE COATINGS. Acta Metall Sin, 2009, 45(9): 1091-1098.

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Abstract  

Particle reinforced metal matrix composite (PR-MMC) has attracted extensive investigation in material science and engineering. Laser depositing of MMC coatings containing in situ carbide particles is a research focus in laser surface processing field. Recent literatures have indicated that the particle size and distribution play an important role on the wear resistance of laser clad coatings. It is necessary to analyze the morphologic characteristics of the particles. In this paper, particle reinforced Fe-based composite coatings were produced by laser cladding Fe-based alloy powders containing Zr+Ti, Ti+WC and Zr+Ti+WC, respectively, on the surface of a medium carbon steel. The carbide particles were analyzed by XRD, SEM and TEM. The results show that during the growth of composited carbide particles, a type of surrounding structure, the inside part of the particle is (Zr, Ti)C while the peripheral part is (Ti, Zr)C, forms when 12%Zr and 3%Ti (mass fraction) are added. When 1%-5% Ti and 10\%WC are added, the particles present petal-like shape with layered structure. When Zr, Ti and WC (7%-10% of Zr and Ti) are added, the particles present irregular polygon shape as low content of WC (5%) added, but become petal-like or even dendrite shape when the content of WC is high (10%-15%). Although the particles have high content of W (30%-50%), they still have TiC structure. The formation mechanism is discussed based on thermodynamic calculations. It is indicated that different strong carbide-forming elements (SCFE) play different roles in the nucleation and growth of particles. Zr and Ti are important elements for particle nucleation. The concentration of W into the particle has a great influence on the growth of the particles. Therefore, the addition of WC can enlarge the particle size and decrease the amount of particles meanwhile. The above results are helpful to select the suitable proportion of SCFEs on laser cladding PR-MMC coatings.

Key words:  laser cladding      particle reinforcement      composited carbide      Fe-based composite coating      thermodynamics     
Received:  10 February 2009     
ZTFLH: 

TN249

 
  TG113

 
Fund: 

Supported by Ministry of Science and Technology of China (No.2007DFA50870)

URL: 

https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2009/V45/I9/1091

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