Full
Outline
To solve the problem that the brazing temperature of existing filler metals for joining the superalloy GH4169 exceeds its δ phase solid solution temperature， which leads to the dissolution of the δ phase during brazing and consequently degrades the high-temperature performance of the alloy， this work conducts a study on a novel low-temperature Ni-based brazing filler for GH4169 and optimizes the brazing process. The brazing temperature is set at 980 ℃， which is comparable to the solid solution temperature of the alloy， in order to achieve a good match between brazing and heat treatment temperatures. Based on the binary phase diagrams， with Pd as the primary melting point depressant and B and Si as the secondary melting point depressants， a novel Ni-based brazing filler of 36Pd-10Cr-3B-1Si-Ni is configured and smelted. The melting point， wettability， and weldability of the novel filler on GH4169-GH536 butt joints are investigated. The results show that the solidus and liquidus temperatures of the novel filler are in the range of 828.82-961.43 ℃， and the wetting angle is 7.8°at 980 ℃ for 15 min， demonstrating excellent wettability， thereby optimizing the brazing process parameters. Under the process conditions of 980 ℃ for 60 min and a joint clearance-free assembly， the maximum room-temperature tensile strength of the brazed joint reaches 586 MPa， which exceeds that of the conventional BNi-2 brazing filler； the high-temperature creep rupture performance at high temperature exceeds 10 h， and the joint is free of obvious defects. Therefore， the novel low-melting Ni-based brazing filler of 36Pd-10Cr-3B-1Si-Ni can be used to achieve effective brazing of GH4169 while preserving its original microstructure and properties.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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