Abstract
The paper presents the results of studies of a five-layer composite material consisting of three layers of titanium VT20 alloy and two layers of stainless 08Kh18N10T steel after explosion welding (EW) and subsequent processing, including hot rolling (HR) and heat treatment (HT) at temperatures of 800, 850 and 900 °C with a holding time of 1 to 100 h to form a layered intermetallic composite (LIC), which has a combination of plastic layers of the original alloys and intermetallic interlayers in contact with them, the presence of which provides the necessary strength characteristics at elevated temperatures. The structure, microhardness, and chemical composition of the diffusion zones of the composite were studied using optical and electron microscopy, X-ray spectral and X-ray diffraction analyses. It is shown that, after EW, the joint zones have a characteristic wavy profile with areas of melted and crystallized metal–flashes, which are solid solutions based on titanium, iron, and Cr(Fe)2Ti intermetallic compound. Hot rolling and HT under the specified conditions led to diffusion processes of main steel elements into the titanium alloy, resulting in the formation of diffusion interlayers adjacent to the steel and titanium alloy, the composition and thickness of which depend on temperature and holding time at certain ratios of chemical elements and phase composition.
Published Version
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