Влияние высокотемпературного азотирования на структуру и свойства свариваемых жаропрочных никелевых сплавов

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Влияние высокотемпературного азотирования…
ISSN 0236-3941. Вестник МГТУ им. Н.Э. Баумана. Сер. Машиностроение. 2016. № 6 41
HIGH TEMPERATURE NITRIDING EFFECT ON STRUCTURE
AND PROPERTIES OF WELDED NICKEL SUPERALLOYS
Kozlova1
S.V. Ovsepyan2
A.S. Pomelnikova1
M.V. Akhmedzyanov2
1 Bauman Moscow State Technical University, Moscow, Russian Federation
2 Federal State Unitary Enterprise All-Russian Scientific Research Institute
of Aviation Materials, Moscow, Russian Federation
Abstract Keywords
The study tested the effect of thermo-chemical treatment
(high-temperature nitriding) on the structure and proper-
ties of sheet samples of welded nickel superalloys with
different types of alloying: homogeneous (VZH98), aging
(VZH159) and nitride dispersion-strengthened alloy
(VZH171). Findings of the research show the positive
effect of high-temperature nitriding on prolonged heat
resistance at 1000 °C for alloys VZH171 and VZH98,
containing titanium. Specially selected ratio of VZH171
alloy compo-nents allows us to create a favorable micro-
structure throughout the entire thickness of the sample
sheet in the process of thermo-chemical treatment. Finally,
we found that formation of dispersed nitride particles in
VZH171 alloy doubles microhardness, and soaking it at
1200 C for 100 hours does not cause significant changes
in the alloy structure
Thermo-chemical treatment,
high-temperature nitriding, nitrides,
structure, nickel superalloys, micro-
hardness, prolonged heat resistance
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