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The Effect of Re Content on Microstructure and Creep Resistance of Single Crystal Castings Made of Nickel-Based Superalloys

Gancarczyk Kamil, Albrecht Robert, Kawalec Małgorzata, Kościelniak Barbara, Gradzik Andrzej, Szeliga Dariusz, Kawalec Andrzej, Ziaja Waldemar, Motyka Maciej

Advances in Science and Technology. Research Journal

2024

Vol. 18, no 1

291--305

In this work the effect of crystal structure perfection on the creep resistance of single crystal superalloys. The CMSX-4 and CMSX-4®Plus with increased Re content is analyzed. Single crystal rods are made by directional solidification process at the withdrawal rates 3 and 5 mm/min. The evaluation of microstructure and crystal structure perfection are carried out by light microscopy and X-ray diffraction Ω-scan methods. Creep tests are performed according to ASTM E-139-11 standard at the temperature of 982°C. Mathematical models for the creep resistance of the models are developed for both investigated superalloys. The influence of the crystal structure on the the investigated superalloys are built and the steady state creep rates are determined. Creep strength of both superalloys are compared. The results show that the CMSX-4®Plus nickel superalloy exhibits nearly two times higher creep resistance compared to the conventional CMSX-4 one.

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

2022

Vol. 67, iss. 4

1551--1561

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.

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

2019

R. 91, nr 9

27--37

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.

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.