| 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 |
| Authors |
진현우(H . W . Jin) ; 임영목(Y . M . Rhyim) ; 박찬경(C . G . Park) ; 김문철(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. |