期刊
SURFACE & COATINGS TECHNOLOGY
卷 205, 期 16, 页码 4068-4072出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2011.02.054
关键词
Laser cladding; Grain refinement; Boundary misorientation; Annealing
资金
- Program for Innovative Research Team in Anhui University of Technology
A 6FeNiCoCrAlTiSi multicomponent ferrous alloy coating with simple BCC solid solution phase has been prepared by laser cladding on a low carbon steel substrate. Grain boundary misorientation transition and abnormal microstructure refinement in the coating after annealing at 500 degrees C have been studied by electron backscatter diffraction (EBSD) observation. Before annealing, the microstructure of the coating is mainly composed of directionally solidified columnar grains with low angle grain boundaries distributed as networks. After annealing, the main phase and microhardness of the coating almost remain unchanged. However, the columnar grains transform to equiaxed refined grains with the grain boundary misorientation transition from low to high angles. This result supports such an argument that the reheating process in post-stage of solidification plays a key role on the grain refinement during rapid solidification process. (C) 2011 Elsevier B.V. All rights reserved.
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