Abstract
In the present paper, the microstructure and fracture resistance characteristics of 7-layered composites based on Fe-2Mn-1Si low carbon low alloyed steel and Fe-11Cr-9Ni-2Mo-1Ti maraging steel obtained by two different methods such as explosion welding and hot pack rolling with subsequent heat treatment were investigated. It was shown that an important microstructural features of Fe-2Mn-1Si steel layers are associated with the formation of a fragmentation zone ~10 μm wide with a size of structural elements 0.5-1.0 μm near the interface in the welded composites and the appearance of decarburized ferrite zone ~50 μm wide in the hot-rolled composites. Aсcording to local energy dispersive X-ray microanalysis, at the interface of welded and hot-rolled composites, the most active diffusion processes near of Fe-2Mn-1Si and Fe-11Cr-9Ni-2Mo-1Ti steel interlayer borders occur during the composites production by pack rolling. It was established that explosion welding makes it possible to retain the initial microstructure of steel blanks, with the exception of a narrow near-weld zone of grain fragmentation. After the subsequent heat treatment of explosively welded and hot-rolled composites, Fe-2Mn-1Si steel layers are characterized by a viscous ferrite(sorbitol)-pearlite microstructure, and Fe-11Cr-9Ni-2Mo-1Ti steel layers possess a martensitic microstructure with strengthening intermetallic particles. From the results of impact tests at temperatures from +20°C to −60°C, it was found that the impact strength KCV and energy of impact loading A of the hot-rolled composites are 2 and 3.5 – 5.4 times higher than the ones of the welded composites, respectively.
Highlights
IntroductionLayered metallic composites (LMC) are related to promising materials for the manufacture of machine parts and structural elements working in cold climates
From the energy dispersive X-ray (EDX) measurements, it was determined that a narrow diffusion zone (5 – 7 μm) was formed in the interface of layers of the Fe-2Mn-1Si steel and the Fe-11Cr-9Ni-2Mo-1Ti steel, the width of which does not change during the subsequent heat treatment
The hot-rolled 7‐layered composites are characterized by a flat interface (Fig. 1c, d)
Summary
Layered metallic composites (LMC) are related to promising materials for the manufacture of machine parts and structural elements working in cold climates. They are increasingly used in such areas as aerospace, nuclear industry, shipbuilding and automotive [1,2,3]. The microstructure and mechanical properties of the LCM produced by pack rolling and containing layers of high-strength maraging steel remain insufficiently explored. The substantiation of the choice of technology for manufacturing layered composites requires comparative studies of the microstructure and the complex of mechanical properties of similar composites obtained by explosion welding and pack rolling
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