期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 246, 期 -, 页码 245-251出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2017.03.021
关键词
TLP bonding; Mar-M247 superalloys; Isothermal solidification; Microstructural evolution; Mechanical properties
资金
- National Natural Science Foundation of China [51205428]
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 degrees 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 degrees 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. (C) 2017 Elsevier B.V. All rights reserved.
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