Abstract
The explosive welding technology is related to the dynamic impact of the clad onto base material. These results in significant microstructural changes of the bonded materials, the increase of internal stresses and the strain hardening of layers near the interface. In order to eliminate these unfavorable effects, it is advisable to carry out proper heat treatment. The paper presents the results of structural examinations and mechanical properties of bimetal zirconium - carbon steel, after long-lasting heat treatment. Bimetallic samples were annealed at 600 o C for 1, 10, 100, 500, 1000 hours. Microscopic examination were used to the analysis of microstructural changes, whereas systematic microhardness measurements and static tensile test to evaluation of the mechanical properties. It was found that the temperature has a beneficial effect on the changes in the bond zone and for longer annealing times a systematic decrease of the strength properties of the tested bimetal was observed. However, essential for the clad mechanical properties changes were observed in carbon steel plate. After short annealing (times of 1h and 10h) only small microstructural changes due to processes of recovery and recrystallization were observed in layers near the interface. The increase of annealing time was conducive to grain growth and carbon diffusion in the interfacial layer from steel towards zirconium.
Highlights
The construction of modern and corrosion-resistant chemical and processing apparatus with a planned long service life and relatively low production costs requires reactive metals, such as titanium, zirconium, tantalum and their alloys, to be used
This study presents the results that form the basis for the quality evaluation of zirconium-carbon steel bond achieved with the use of explosion welding
Brittle nature of the melted zones contributes to the occurrence of cracks, which are visible during the microscopic examination
Summary
The construction of modern and corrosion-resistant chemical and processing apparatus with a planned long service life and relatively low production costs requires reactive metals, such as titanium, zirconium, tantalum and their alloys, to be used These materials in the form of rolled flat products, i.e. plates or tapes are relatively expensive. The only technology that enables materials with very different physical and chemical properties to be join together is explosion welding It enables to achieve adequately high strength parameters of the bond that ensure the wide industrial processing and use of clad elements in all sorts of constructions. The impact of a long-lasting effect of a high temperature on the structural changes and mechanical properties of zirconium (the flyer plate) and carbon steel (the base plate) plates were analysed.
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