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ArticleName Effect of hot isostatic pressing temperature on the structure and mechanical properties of the bimetal aluminium alloy AMg6/Steel 12Kh18N10Т
DOI 10.17580/tsm.2020.02.11
ArticleAuthor Makhina D. N., Denisov V. N., Klyatskin A. S., Nikulin S. A.

Kompozit JSC, Korolev, Russia:

D. N. Makhina, Junior Researcher, e-mail:
V. N. Denisov, Senior Researcher, Candidate of Technical Sciences

A. S. Klyatskin, Head of the Welding and Soldering Department


National University of Science and Technology MISiS, Moscow, Russia:
S. A. Nikulin, Head of the Department of Metal Science and Physics of Strength, Doctor of Technical Sciences


Bimetals on the base of aluminum alloys and stainless steel are extensively used in the rocket and space, shipbuilding, automobile industries. Depending on the requirements and practical applications of an aluminum alloy-steel bimetal, critical parts are manufactured preferably by solid-state welding. A research of a structure and bond strength of an aluminum alloy connection (Grade AMg6) with stainless steel (Grade 12Kh18N10T) with an aluminum interlayer (AD1) manufactured by diffusion welding under hot isostatic pressing conditions (HIP) has been performed. The research includes an influence of the temperature on the structure by scanning electron microscopy, electron microprobe analysis, mechanical tests and fractography methods. The obtaining of the bimetal was performed in a laboratory gasostat in the temperature range from 530 to 570 oC. The research results of the transition area structure, on the border between steel and the interlayer, are shown. It was revealed that the intermetalic layer based on ferrum, chromium, nickel and aluminium is formed in the transition area on the border between steel 12Kh18N10T and aluminum AD1. The structure of the intermetalic layer defines mechanical properties of the bimetal (aluminum alloy AMg6 – steel 12Kh18N10T). It was found that under the HIP temperature of the bimetal, 540 oC, on the border between steel and the interlayer a discontinuous layer consisted of separate particles of the intermetalic metal has formed. The thickness of the layer is 3 μm. In addition to this, the values of ultimate tensile strength and ultimate bending strength of the bimetal connection were 157–205 MPa and 282–352 MPa accordingly.

keywords Bimetal, connection of dissimilar metals, aluminum-steel, aluminum alloy AMg6, stainless steel 12Kh18N10T, interlayer of an intermetalic metal, diffusion welding, hot isostatic pressing

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