발간논문

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Vol.36, No.11, 1909 ~ 1915, 1998
Title
Joint - Syposium on Fine - Grained Materials by the Phase Transformation Committee ( Eighth ) and the Ferrous Metallurgy Committee ( Second ) : Grain Growth and Modeling ; Microstructural development of nanocrystalline Fe-Cr-B alloy during the thermal spr
진현우 , 임영목 , 박찬경 , 김문철 H . W . Jin , Y . M . Rhyim , C . G . Park , M . C . Kim
Abstract
High boron containing Fe-Cr alloy powder has been investigated in this research as to its microstructure evolution by the rapid solidification in thermal spraying process. The Fe-Cr alloy powder consists of Cr-rich metal borides, such as Cr_(1.65)Fe_(0.35)B_(0.96) and Cr₂B, within Fe-Cr solid solution matrix phase. In the alloy powder, the boron content in the matrix phase was extremely low. Boron was supplied to the matrix Fe-Cr solid solution phase by the thermal dissolution of Cr-rich boride particles during the thermal spraying. Cross-sectional TEM observation on the coatings indicates that the coated layer is composed of equiaxed nanocrystalline Fe-Cr solid solution phase and boride particles. The formation of equiaxed nanocrystalline phase indicates that large undercooling could be attained during the rapid solidification of thermal spraying process.
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