The aim of the study was to develop a technology for welding non-weldable 42CrMo4 and NANOS-BA® steel grades in the process of hot rolling and two-stage heat treatment. As a result of physical experiments carried out in a line for semi-industrial simulation of the production of metals and their alloys (LPS) and additional heat treatment, a durable combination of 42CrMo4 and NANOS-BA® steels with high mechanical properties was obtained, including: Rp0.2 = 1036 MPa, Rm = 1504 MPa and A = 10.9%, without microscopically visible cracks and other discontinuities in the joined surface. The quality of the 42CrMo4/NANOS-BA® clad plates produced in this way was assessed on the basis of microstructure examination as well as bending, shear and tensile strength tests.
The aim of the paper is to determine the correlation between mechanical properties determined in quasi-static tensile tests and dynamic compression tests, and resistance to perforation and cracking in firing tests of nanostructured bainitic steel sheets. The relationship between mechanical characteristics and ballistic resistance makes it possible to specify and optimise the production parameters of steel elements for armour and shields providing ballistic protection. As a result of the tests, the level of mechanical parameters and the type of microstructure, as well as the minimum thickness of the nanostructured bainitic steel sheet, ensuring compliance with the requirements of level 2 ballistic protection according to Stanag 4569, were determined.
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