Joining of superalloy Inconel 617 using a foil interlayer with transient liquid phase bonding (TLP) was studied. Inconel 617 is a solid solution, Ni-Cr-Co-Mo alloy with an exceptional combination of high temperature strength, oxidation and carburization resistance and thermal stability. / Two types of interlayer compositions for the TLP bonding process were selected. Specifically, boron containing (AWS BNi-3) and phosphorus rich (AWS BNi-6) were employed as melting point depressant (MPD) elements. Process parameters such as bonding temperature, holding time, composition and thickness of interlayer were selected for study. Two bonding temperatures, 1065°C and 1150°C, and two interlayer thicknesses with various holding times ranging from 5 minutes to 24 hours were selected. / Joints were fabricated using Inconel 617 specimens measuring 25 mm long, 5 mm wide and 1 mm thick. A tube furnace under vacuum (1 x 10-5 mbar) was used to carry out the experiments. The specimens were fixed with stainless steel fixture and held at the bonding temperature for the selected times. / Optical microscopy, SEM, FEG-SEM, VP-SEM were used to follow microstructure evolution and identify its constituents. The microstructure of the joint area, formation and dissolution of precipitates and the evolution of the base metal grain size with holding time for the two bonding temperatures and interlayer thickness were also characterized using the above techniques. TEM, EBSD and XRD techniques were employed to identify the phases such as borides, carbides, phosphides and other precipitates in the joint area. Microhardness tests of the joint were performed to investigate relationships between microstructure and mechanical properties of the joint. A critical review of the existing theoretical models for isothermal solidification of the TLP bonding was carried out and their application to the obtained results for Inconel 617 was assessed.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.102512 |
| Date | January 2006 |
| Creators | Jalilian, Farzad. |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Doctor of Philosophy (Department of Mining, Metals and Materials Engineering.) |
| Rights | © Farzad Jalilian, 2006 |
| Relation | alephsysno: 002571615, proquestno: AAINR27793, Theses scanned by UMI/ProQuest. |
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