Abstract
Surface protection by the application of explosive welding is one of the meaningful methods used in many chemical devices like reactor condensers, heat exchangers, steam turbines and other processing apparatus. Due to the wide range of explosively welded applications, the problem of the useful lifetime of the products obtained by this method becomes important and should be well understood. Process of explosive welding is related to enormous pressure and high detonation velocity, which causes intense energy release in a short time, which favors to produce solid wavy bond featured with high metallurgical quality. Due to strain hardening in the bond zone, significant changes in microstructures and mechanical properties were observed. In this paper, 316L stainless steel explosively welded with commercially pure titanium was investigated to show the correlations and changes between microstructures and mechanical properties before and after annealing. Application of post-weld heat treatment contributes to stress relieving and improves the mechanical properties, which is closely related to microstructure recrystallization and hardness decrease adjacent to joint.
Highlights
The problem of the surface protection is one of the most important subjects in the production of modern engineering structures, due to increasing demands in the area of efficiency, strength, reliability and fatigue life of required applications
Because of the numerous advantages, explosive welding method is used to produce pipes, tubes, chemical process vessels and many applications in shipbuilding and cryogenic industry but major areas using of this method are applications in power plants like heat exchanger tube sheets, pressure vessels and steam condensers [6,7,8]
Experimental work in this paper is focused on the study of influence the post-heat treatment on microstructure and mechanical properties of explosively welded austenitic stainless steel 316L with commercially pure titanium, which is used to produce the sieve trays of heat exchangers (Fig. 1)
Summary
The problem of the surface protection is one of the most important subjects in the production of modern engineering structures, due to increasing demands in the area of efficiency, strength, reliability and fatigue life of required applications. Often surface protection is realized by coatings, but due to different chemical composition and structure of the connected materials, sometimes joining process is impossible to carry out by conventional welding or bonding methods [1,2,3]. This problem can be solved by using an explosive welding method which is one of the most effective technical engineering processes among joining methods because is used to join a wide variety of similar or different metals like steel and titanium [4]. Analysis microstructures, methods of light and scanning electron microscopy were used, supplemented by microhardness and three-points bending tests
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