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The Effect of Selected Process Conditions on Microstructure Evolution of the Vacuum Brazed Joints of Hastelloy X Nickel Superalloy Sheets

Krystek Kamil, Krzanowska Karolina, Wierzbińska Małgorzata, Motyka Maciej

Archives of Metallurgy and Materials

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2022

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Vol. 67, iss. 4

1551--1561

EN

High temperature vacuum brazing is a well-known and commonly used method for joining of nickel based elements and subassemblies of gas turbines, both for stationary and aviation applications. Despite the fact that currently used brazing filler metals meet stringent requirements of aviation and energetic industries, a lot of effort is spent on improving operational properties of the joints through modification of chemical composition or brazing process parameters. This paper aims for both of these aspects - its purpose is evaluation of the impact of filler metal composition, brazing gap width and process conditions on the microstructure of joints between sheet metal elements made of Hastelloy X nickel superalloy. Two different Ni-based filler materials (BNi-2 and Amdry 915) were investigated, based on the results of light and scanning electron microscopy evaluations, energy dispersive X-ray spectroscopy and hardness measurements.

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The influence of interrupting the brazing process of Hastelloy X superalloy on the properties of the joint

Krystek Kamil

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

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2021

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z. 93 [302]

31--40

EN

In this paper, disruption of brazing process impact on behavior of filler metal and properties of the joint was investigated. Hastelloy X sheet samples were brazed using Ni-13Cr-4Fe-4Si-2,7B filler alloy. Two identical sets of samples were heated in high vacuum, once load reached specified temperature process was interrupted. Subsequently, one set of samples was tested and second set was subjected to rebrazing in proper time and temperature, dedicated for used filler material. Disruption of the process in following temperature was analyzed: 930, 960, 1050, 1127, 1145, 1170°C. After both processes macroscopic observations of joint, peel test, static tensile test and spreadability analysis were carried out.

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Influence of vacuum brazing temperature on the microstructure of an Inconel 783 superalloy joint with a honeycomb sealing made of Hastelloy X superalloy

Krystek Kamil, Dul Irena, Motyka Maciej

Welding Technology Review

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2019

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R. 91, nr 9

27--37

EN

The purpose of this work was to assess the influence of brazing temperature on microstructure of the cobalt-based Inconel 783 superalloy joint with nickel-based Hastelloy X superalloy ‒ seal shaped in honeycomb structure. Brazing process was combined with solution heat treatment of Inconel 783 in one operation. Nickel based brazing filler metal from BNi-2 group was used. Tests were conducted in 1121 °C (solutionizing temperature), 1075 °C and 1030 °C in 1 hour. Subsequently, metallographic investigations were made using optical and scanning electron microscopes, mainly focused on changes in a seal made of Hastelloy X, where joint erosion in higher temperature was observed.

PL

Celem niniejszej pracy była ocena wpływu temperatury lutowania na mikrostrukturę złącza obudowy turbiny z nadstopu kobaltu Inconel 783 z uszczelnieniem o strukturze plastra miodu z nadstopu niklu Hastelloy X. Procesy lutowania i przesycania nadstopu Inconel 783 prowadzono łącznie - w jednej operacji technologicznej. Zastosowano lutowie niklowe z grupy BNi-2. Złącza wykonano w temperaturze 1121°C (przesycania), 1075 °C, 1030 °C w czasie 1 godziny. Następnie przeprowadzono obserwacje mikrostruktury złącza metodami mikroskopii świetlnej i elektronowej skaningowej, ze szczególnym uwzględnieniem zmian zachodzących w materiale uszczelnienia ze stopu Hastelloy X, w którym obserwowano zjawisko erozji złącza w górnym przedziale stosowanej temperatury lutowania.