Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5018032 | Journal of Materials Processing Technology | 2017 | 7 Pages |
Abstract
The three-stage isothermal solidification process of TLP bonded Mar-M247 nickel-based superalloy was studied. The transient liquid phase bonding of Mar-M247 superalloys was conducted at 1150 °C for 1, 60, 120 and 240 min. Dendritic formation and solute partitioning governed the microstructure development. Ni-rich solid solution, Ni-rich boride W-rich boride and other carboborides were formed in the joint area. The maximum tensile strength of 443 MPa was obtained when TLP bonding at 1150 °C for 240 min. It had completed isothermal solidification. After isothermal solidification, the distribution of microhardness across the joints was more homogeneous. Enrichment of refractory elements in the Ni-Cr-Co-W-Ta-B interlayer was detrimental to the process of isothermal solidification. The presence of hard and brittle borides reduced the hardness and tensile strength of the bonded area. Post-bonding heat treatments are suggested to improve mechanical properties in future studies.
Related Topics
Physical Sciences and Engineering
Engineering
Industrial and Manufacturing Engineering
Authors
Ming-can Liu, Guang-min Sheng, Hong-jie He, Ying-jun Jiao,