All-Russian Scientific Research Institute of Aviation Materials “VIAM”, Moscow, Russia

E. A. Tkachenko, Head of Department, e-mail: admin@viam.ru
O. G. Senatorova, Head of Department
T. V. Milevskaya, Engineer
A. L. Ivanov, First Category Engineer

There was investigated the influence of grain structure (average grain size from 40 to 400 μm) on mechanical, corrosion and technological properties, fracture toughness and fatigue life of clad sheets made of basic aluminum alloys of V95pch (В95пч) grade (T1, T2, М tempers) and 1163 grade (T, М tempers). The distinctive feature of this study is obtaining of used sheets with different grain size from the alloys of the same casting and rolling group. Influence of all other factors on the sheet properties (except the grain size) was minimized because of this obtaining. For the purpose of this study, there was used a group of plated cold rolled sheets (2–3 mm thickness) with a grain size (at the rolling plane) of the substrate sheet in the range of 40–400 μm. Sheets were manufactured by the serial process technology at the production conditions of “Kamensk Uralsky Metallurgical Works” JSC (“KUMZ” JSC) (V95pch alloy) and “Stupino Metallurgical Company” JSC (1163 alloy). For the purpose of obtaining of sheets with different grain size, the initial party of sheets made of V95pch alloy and 1163 alloy were annealed by the serial regime and special regimes with longer shutter speeds and lower heating and cooling speeds. The obtained experimental dependences of complex of mechanical, corrosion and technological properties of lagging clad cold-rolled sheets made of V95pch and 1163 alloys from the grain size make it possible to clarify the requirements of normative documentation of the permissible average grain size (not more than 200 μm). The requirements provide the necessary level of properties, which increases the reliability and resource during the exploitation of parts of cladding of modern and prospective aircrafts (SSJ, TU204SM, MS-21 etc.) due to increasing of stability of level of the service characteristics of clad sheets.

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