<abstract xmlns="http://www.w3.org/1999/xhtml"> The aim of the present study was to characterize the repair weld of serviced (aged) solid-solution Ni-Cr-Fe-Mo alloy: Hastelloy X. The repair welding of a gas turbine part was carried out using Gas Tungsten Arc Welding (GTAW), the same process as for new parts. Light microscopy, scanning electron microscopy, transmission electron microscopy, microhardness measurements were the techniques used to determine the post repair condition of the alloy. Compared to the solution state, an increased amount of M6C carbide was detected, but M23C6 carbides, sigma and mu phases were not. The aged condition corresponds to higher hardness, but without brittle regions that could initiate cracking.</abstract>

The aim of the present study was to characterize the repair weld of serviced (aged) solid-solution Ni-Cr-Fe-Mo alloy: Hastelloy X. The repair welding of a gas turbine part was carried out using Gas Tungsten Arc Welding (GTAW), the same process as for new parts. Light microscopy, scanning electron microscopy, transmission electron microscopy, microhardness measurements were the techniques used to determine the post repair condition of the alloy. Compared to the solution state, an increased amount of M6C carbide was detected, but M23C6 carbides, sigma and mu phases were not. The aged condition corresponds to higher hardness, but without brittle regions that could initiate cracking.

Microstructure and Properties of a Repair Weld in a Nickel Based Superalloy Gas Turbine Component

Advances in Materials Science

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

The aim of the present study was to characterize the repair weld of serviced (aged) solid-solution Ni-Cr-Fe-Mo alloy: Hastelloy X. The repair welding of a gas...

Microstructure and Properties of a Repair Weld in a Nickel Based Superalloy Gas Turbine Component

Published Online: Aug 01, 2017

Page range: 55 - 63

DOI: https://doi.org/10.1515/adms-2017-0011

Keywords
long term service, gas turbine, superalloys, TEM, Hastelloy X

© by Ł. Rakoczy

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Microstructure and Properties of a Repair Weld in a Nickel Based Superalloy Gas Turbine Component

Published Online: Aug 01, 2017

Page range: 55 - 63

DOI: https://doi.org/10.1515/adms-2017-0011

Keywordslong term service, gas turbine, superalloys, TEM, Hastelloy X

© by Ł. Rakoczy

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
long term service, gas turbine, superalloys, TEM, Hastelloy X