EFFECT OF COOLING RATE ON TITANIUM AND STAINLESS STEEL JOINTS PERFORMED WITH COPPER INTERLAYER

1 KONIECZNY Marek
Co-authors:
1 SZWED Bartłomiej
Institution:
1 Kielce University of Technology, Faculty of Mechatronics and Mechanical Engineering, 25-314 Kielce, 1000-lecia P.P. av. 7, mkon@tu.kielce.pl
Conference:
25th Anniversary International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 25th - 27th 2016
Proceedings:
Proceedings 25th Anniversary International Conference on Metallurgy and Materials
Pages:
1456-1461
ISBN:
978-80-87294-67-3
ISSN:
2694-9296
Published:
14th December 2016
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
93 views / 19 downloads
Abstract

Microstructure and mechanical response of joints of titanium and AISI 304 stainless steel performed using copper foil as an interlayer was evaluated in the study. The process was carried out in vacuum in the temperature range of 850 to 900 C for 60 min. The effect of temperature and cooling rate after processing stage on the microstructure and mechanical properties of the joints were analyzed by means of optical and scanning electron microscopy (SEM), electron probe microanalyses, microhardness measurements and tensile and shear strength tests. The maximum values of tensile and shear strengths were obtained for the joints processed at 900 C for 60 min. The cooling rate after bonding stage had significant influence on the microstructure and composition of the copper/titanium interface that could contain the eutectoid mixture of -Ti+CuTi2 or the undercooled -Ti solid solution. The difference in mechanical properties of joints slowly and rapidly cooled reached up to 25 MPa and increased with lowering joining temperature. Observation of fracture surfaces of the joints slowly and rapidly cooled demonstrated that failure took place through the eutectoid mixture or stainless steel/copper interface, respectively.

Keywords: Titanium, stainless steel, copper interlayer, microstructure, properties

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