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Development and implementation of robotized wire arc additive repair of a gas turbine diaphragm

Steckowicz Piotr, Pyrzanowski Paweł, Bulut Efe

Bulletin of the Polish Academy of Sciences. Technical Sciences

2024

Vol. 72, nr 2

art. no. e147920

The current practice of reconstruction of oxidized turbine parts (due to hot corrosion) using arc welding methods facilitates restoration of the nominal shapes and dimensions, as well as other attributes and features. Intense development of 3D additive methods and techniques contributes to the repair/modification of different parts including gas turbine (GT) hardware. The article proves the viability of the concept of using a robotized additive arc welding metal active gas (MAG) process to repair and modify gas turbine diaphragms using different filler materials from the substrate. The industrialized robotic additive process (hybrid repair) shows that very good results were achieved if the diaphragm is cast of nickel-iron and the filler material for welding the passes is austenitic stainless steel (for instance 308 LSi). This is one of the novelties introduced to the repair process that was granted a patent (US11148235B2) and is already implemented in General Electric Service Centers.

Fatigue Resistance and Other Utility Properties of NiMn-Type of Austenitic Nodular Cast Iron

Vaško Alan, Uhríčik Milan, Kaňa Václav

Archives of Metallurgy and Materials

2023

Vol. 68, iss. 2

563--569

The aim of this paper is to evaluate the fatigue resistance of austenitic nodular cast iron and to compare it with other types of nodular cast irons. The austenitic nodular cast iron, used for the experiments, was alloyed by 13% nickel and 7% manganese (EN-GJSA-XNiMn13-7) to obtain an austenitic matrix. The microstructure was studied using light metallographic microscopy. Mechanical properties were investigated by tensile test, impact bending test and Brinell hardness test. Fatigue tests were carried out at sinusoidal cyclic push-pull loading at ambient temperature. The results of fatigue tests were compared with the fatigue properties of ferrite-pearlitic nodular cast iron and pearlite-ferritic nodular cast iron. Experimental results show that NiMn-type of austenitic nodular cast iron has lower tensile strength and hardness, but higher elongation and absorbed energy than the compared types of nodular cast iron. However, austenitic nodular cast iron has lower fatigue limit.

Żeliwo Ni-resist o obniżonej zawartości niklu

Pietrowski S., Bajerski Z.

Archiwum Odlewnictwa

2005

R. 5, nr 17

445--458

W pracy przedstawiono wyniki badań nad możliwością obniżenia w żeliwie Ni-Resist niklu z 13,50-17,50% do 8,50-10,00% z zachowaniem osnowy austenitycznej. Wykazano również, że poprzez odpowiedni dobór kompozycji manganu, chromu i niklu można sterować procesem krystalizacji eutektycznej żeliwa, oraz temperaturą krystalizacji węglików pierwotnych typu (Fe,Cr,Mn)3C.

In this paper the results of possiblity of nickel contents reduction in Ni-Resist cast iron from 13,50-17,50 to 8,50-10,00% with maintenance of an austenite matrix have been presented. It was demonstrated, that there is the possibly of control of cast iron eutectic crystallization and a crystallization temperature of (Fe,Cr,Mn)3C primary car-bides by proper selection of manganese, chromium and nickel composition.