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No. 2/2021
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Contents


Jarosław MARCISZ
Artur ŻAK
Jerzy STĘPIEŃ
Marek BURDEK
Tymoteusz TOMCZAK

Łukasiewicz Research Network – Institute of Ferrous Metallurgy

Wojciech BURIAN

Łukasiewicz Research Network – Institute of Non-Ferrous Metals

Jacek JANISZEWSKI

Military University of Technology, Faculty of Mechatronics, Armament and Aerospace

Mateusz PYTLIK

Central Mining Institute

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF STEELS FOR SHAPED CHARGE LINERS AND PRELIMINARY ASSESSMENT OF THE EFFECTIVENESS OF EXPERIMENTAL SHAPED CHARGES INTENDED FOR USE IN THE MINING INDUSTRY

The paper presents the results of investigation of the microstructure and mechanical properties of Fe-based materials designed for the manufacture of semi-spherical liners for experimental shaped charges. The tests were carried out on material samples taken from two semi-finished products, i.e. a rod for the manufacture of charge liners with a diameter of 50 mm using machining, and sheets for the manufacture of liners with a diameter of 100 mm using cold drawing. Microstructure examination was also carried out on a test specimen obtained using the additive method (3D-WAAM), made of low-carbon unalloyed steel wire. Firing tests on concrete blocks were carried out in order to quantify the effects of drilling at the Experimental Mine Barbara. The scope of the tests consisted of firing at cylindrical concrete blocks using projectiles containing 50 mm diameter liners made of Fe-based alloys. Based on the results of the laboratory material, two experimental steel grades were selected for further testing. Plates made of the selected steels will be used to manufacture charge liners with a diameter of 100 mm.

Keywords: shaped charge liners, Fe-based alloys, microstructure, mechanical properties, rock drilling


Jarosław MARCISZ
Bogdan GARBARZ
Tymoteusz TOMCZAK
Aleksandra JANIK
Władysław ZALECKI
Marek BURDEK
Mariusz ADAMCZYK

Łukasiewicz Research Network – Institute of Ferrous Metallurgy

Lech STARCZEWSKI
Michał GMITRZUK
Robert NYC

Military Institute of Armored and Automotive Technology (WITPiS)

Marcin GOŁUŃSKI

Tarnów Mechanical Works (ZMT)

Krzysztof ŻÓŁKIEWSKI
Paweł LUBOWIECKI

ALCHEMIA S.A.

Marcin SKURCZYŃSKI

Heatmasters Poland Sp. z o.o.

DEVELOPMENT OF TECHNOLOGY FOR THE PRODUCTION OF LIGHTWEIGHT OBSERVATION AND PROTECTIVE CONTAINER (LOOK) MADE OF NANOSTRUCTURED ULTRA-STRENGTH STEELS

The article contains results of research and analyses concerning application of nanostructured bainitic steel in the form of plates for manufacturing of armour components. The presented results of examination of microstructure and properties include a wide range of laboratory experiments and industrial tests, which resulted in the achievement of the assumed functional properties. In the period of 2017-2021, a scientific and industrial consortium consisting of Łukasiewicz – Institute of Ferrous Metallurgy (leader); WITPiS, Tarnów Mechanical Works, Alchemia and Heatmasters Poland carried out a project funded by the POIR 04.01.04 programme aimed to develop the design and to manufacture an observation and protective container with a specified resistance to penetration by armour-piercing projectiles and with a lower mass of steel armouring in relation to that currently produced. The aim of the project was achieved by using armour plates made of nanostructured bainitic steel (nanobainitic), which are characterised by high resistance to high-energy impact concentrated in a small area. The technological tests carried out in the project mainly concerned the development of a new container and industrial technology of armour plates production and their application in the armour of this container. Based on the results of investigation of the semi-industrial scale material, the optimum chemical composition for industrial scale melting and casting was determined. An industrial technology for the production of plates of nano-structured bainitic steel was developed, which includes the following processes: smelting and casting, preliminary heat treatment and ingot hot processing, as well as hot rolling, final heat treatment, and surface treatment. A test batch of the material in the form of 1500×2470 mm armoured plates was fabricated under industrial conditions. The final result of the project is a container armoured with bainitic nanostructured steel plates with implementation documentation and a technology for producing armoured plates from this steel under the technical and technological conditions of domestic steel manufacturers.

Keywords: nanostructured bainitic steel, production technology, plates, microstructure, mechanical properties, ballistic protection, observation and protective container


 

Joanna FURMANEK
Janusz DOBRZAŃSKI

Łukasiewicz Research Network – Institute of Ferrous Metallurgy

STRUCTURE AND MECHANICAL PROPERTIES OF 21HMF STEEL STEAM TURBINE ROTOR MATERIALS AFTER LONG-TERM OPERATION FOR A TIME SIGNIFICANTLY EXCEEDING THE DESIGN TIME

The article presents the results of tests of materials for steam turbine rotors with various degrees of depletion in order to determine the suitability of these components for further operation after significantly exceeding the design working time on the basis of the assessment of the microstructure condition and a set of functional properties.

Keywords: rotor, turbine, microstructure, mechanical properties

 

2021-10-07


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