Wetting and Grain Boundary Penetration of 42CrMo4 Steel by Copper

Varanasi, Dheeraj and Baumli, Péter (2020) Wetting and Grain Boundary Penetration of 42CrMo4 Steel by Copper. Materials Science and Engineering, 45 (1). pp. 323-331. ISSN 2063-6792

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Abstract

Process like brazing and soldering are used in electronic packaging of integrated circuits, fabrication of heat exchangers for both commercial and aerospace applications. They are also used in manufacturing of high-performance sturdy equipment. Wetting plays a major role in these processes as it determines the efficiency and efficacy of the joints. The present study is focussed on understanding the wettability of low alloyed steels like 42CrMo4 (1.2 w% Cr, 0.75 w% Mn, 0.3 w% Mo) by molten copper. The experiments were conducted at 1,100 °C under vacuum. The sessile drop technique is used and a good wetting is observed by copper on the surface of the steel. The wetting is almost spontaneous agreeing with the widely known phenomenon of excellent metal/metal wetting. Scanning Electron Microscopy (SEM-BSD) analysis showed excellent grain boundary wetting and corresponding groove formation at the steel/Cu interface. These grooves formed at the interface further leads to formation of copper channels which will result in grain boundary penetration of steel by copper.

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