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ArticleName Thermal fatigue damage of steel joints brazed with various nickel filler metals
DOI 10.17580/nfm.2019.01.06
ArticleAuthor Penyaz M. A., Ivannikov A. A, Kalin B. A., Dzhumaev P. S.

National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Russia, Moscow:

M. A. Penyaz, Post-Graduate Student, Department №9 “Physical problems of materials science”, e-mail:
A. A. Ivannikov, Senior Lecturer, Department №9 “Physical problems of materials science”, e-mail:
B. A. Kalin, Professor, Department №9 “Physical problems of materials science”, e-mail:
P. S. Dzhumaev, Associate Professor, Department №9 “Physical problems of materials science”, e-mail:


The article was attended by the staff of the Department №9 “Physical problems of materials science” NRNU MEPhI – Sevryukov O. N., Suchkov A. N., Fedotov I. V.


Demands on the properties of constructions are constantly being increased and the technology of producing permanent joints is crucial for advancement of the high-tech industry. This investigation focuses on thermal fatigue of austenitic steel joints, brazed with nickel filler metals based on Ni – Cr – Si system. This type of fatigue has nonmechanical origin and arises from the cyclic variation of thermal stresses with temperature changes. For investigation selected temperature range is: from room temperature to 450 oC (low-cycle fatigue). Due to inhomogeneous thermal expansion or compression during thermal fatigue, thermal stresses and deformation arise and lead to microstructural changes in the joint zone. This can have a strong effect on the mechanical characteristics of the joint. Therefore, it is important to investigate the properties of the brazed seam after thermal cycling. In this work samples brazed various filler metals before and after thermocycling were evaluated using various methods. The microstructures were investigated and analysis by energy-dispersive X-ray spectroscopy (EDS) of the diffusion zone was carried out using electron microscope. The main regularities of the structure-phase state formation studied using electron backscatter diffraction (EBSD). Standard tests for the tensile strength of the samples were carried out. The result of this research is the prediction of the durability and reliability of brazed steel constructions operating under conditions of low-cycle temperature changes.

The reported study was funded by RFBR and DFG according to the research project №19-52-12030.
This work was supported by the MEPhI Academic Excellence Project.

keywords Joint, diffusion brazing, filler metal, BNi-2, EBSD, heat-resistant steel, nickel, boron

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