Effect of Chemical Composition Variability on Phase Composition and Structure of Beta-Solidifying TiAl-Alloy in As-Cast Condition


Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Тек жазылушылар үшін

Аннотация

The regularities of the effect of the variation in the chemical composition of the new Russian β‑solidifying TiAl-alloy (Ti–44.5 Al–2 V–1 Nb–2 Cr/1 Zr–(0–0.1) Gd, at %) within the chromium content from 1.5 to 2.5 at % (2.0–3.5 wt %) and zirconium from 0.5 to 1.5 at % (1.2–3.5 wt %), as well as the effect of gadolinium microalloying on the phase composition and the structure of ingots, have been studied. The ingots were obtained using double vacuum-arc remelting with the subsequent vacuum-induction melting and pouring of the melt into the steel chill mold at the melting-casting unit with a cold crucible. It is shown that 0.1 at % gadolinium microaddition results in a decrease in the average size of the macro grains from 3000 ± 500 μm to 400 ± 80 μm in the peripheral part of the ingots after the first remelting. It was found that the phase composition of TiAl-alloy compositions with Cr and Zr is represented by three main phases: γ-TiAl, α2-Ti3Al, and β-phase. The volume fraction of β-phase does not exceed 2–3% in ingots containing Zr, while it reaches 5–6% in ingots containing Cr. It was revealed that the microstructure of the ingots of all studied chemical compositions has a lamellar morphology. Sprouting of lamellar colonies through the grain boundaries was noted for ingots containing Zr.

Авторлар туралы

P. Panin

All-Russian Scientific Research Institute of Aviation Materials (FSUE VIAM)

Хат алмасуға жауапты Автор.
Email: PaninPaV@yandex.ru
Ресей, Moscow, 105005

N. Nochovnaya

All-Russian Scientific Research Institute of Aviation Materials (FSUE VIAM)

Email: lukinaea@mati.ru
Ресей, Moscow, 105005

E. Lukina

Moscow Aviation Institute (National Research University) (NRU MAI)

Хат алмасуға жауапты Автор.
Email: lukinaea@mati.ru
Ресей, Moscow, 125993

A. Kochetkov

All-Russian Scientific Research Institute of Aviation Materials (FSUE VIAM)

Email: lukinaea@mati.ru
Ресей, Moscow, 105005

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