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Transmission electron microscopy characterization of laser welding cast Ni-based superalloy K418 turbo disk and alloy steel 42CrMo shaft

2007; Elsevier BV; Volume: 461; Issue: 1-2 Linguagem: Inglês

10.1016/j.jallcom.2007.07.079

1873-4669

Xiubo Liu, Ming Pang, Jian Guo, Gang Yu,

Microstructure and Mechanical Properties of Steels

Microstructure characterization is important for controlling the quality of laser welding. In the present work, a detailed microstructure characterization by transmission electron microscopy was carried out on the laser welding cast Ni-based superalloy K418 turbo disk and alloy steel 42CrMo shaft and an unambiguous identification of phases in the weldment was accomplished. It was found that there are γ-FeCrNiC austenite solid solution dendrites as the matrix, (Nb, Ti) C type MC carbides, fine and dispersed Ni3 Al γ′ phase as well as Laves particles in the interdendritic region of the seam zone. A brief discussion was given for their existence based on both kinetic and thermodynamic principles.