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6022 |
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Tuesday, May 21, 2019, Saal Brüssel 2:20 PM Brazing for turbine applications |
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Investigations on vacuum furnace brazed dissimilar material compounds of 16Mo3 and INCONEL 625 using nickel based filler materials |
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Robin Blank* / Siemens AG, Germany Ingo Reinkensmeier / Siemens AG, Germany Thomas Uhlig/ TU Chemnitz, Germany Guntram Wagner/ TU Chemnitz, Germany |
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Nickel based filler materials for brazing processes containing Boron and/or Silicon as melting point depressants can potentially cause critical local changes of the base materials chemical composition. In vacuum furnace brazing, which deals with long holding times and accurate cooling conditions dependent on the assemblies geometry, significant deviations to the initial state can be provoked. The effect of the occurring variants strongly depends on the base materials used. Thus, single components of dissimilar material combinations can be affected differently by the brazing process. These differences include the diffusion depth, stabilization effects and the tendency of phase formation, which have to be considered in the arrangement and design of the brazing assembly and their post processing. This work provides insights into investigations about the material combination of the low alloyed steel 16Mo3 (1.4515) and the nickel based alloy INCONEL 625 (2.4856, NiCr22Mo9Nb), which is applied for GT burners. For compounds brazed with nickel based filler materials, the affected regions and their influences will be presented in detail and countermeasures will be suggested. |