Changes in Mechanical Properties of Armoured UHSLA Steel ARMOX 500 After Over Tempering

ARMOX steel is an armoured steel with excellent mechanical properties as well as dense hardness, tensile strength and a high level of toughness. These properties result from specific production processes finished with rolling quenching and tempering. The producer of ARMOX steel recommends their secondary processing (cutting, welding, shaping) at temperatures lower than 200°C due to over tempering and the degradation of mechanical properties in heat affected areas. This paper describes the mechanisms and reasons for this degradation including the simulation of the cooling processes concerning ARMOX 500 steel

Analiza AFM i nanoindentacja wybranych stopów aluminium

The structure of EN AW 6082 aluminium alloy is investigated in this paper. Atom force microscopy (AFM) is used to identify present phases and their morphology. AFM enabled to observe even the precipitates, their size and distribution. In the next step, some structure constituent described by AFM were evaluated by the nanoindentation process to determine their local mechanical properties, such as nanohardness and reduced modulus.W artykule opisano strukturę stopu aluminium AW 6082. Mikroskopia sił atomowych (AFM) służy do identyfikacji obecnych faz i ich morfologii. AFM umożliwił obserwację nawet wtrąceń, ich wielkości i rozmieszczenia. W następnym etapie niektóre składniki struktury opisane przez AFM zostały ocenione w procesie nanoindentacji w celu określenia ich lokalnych właściwości mechanicznych, takich jak nanotwardość i zredukowany moduł

Analysis of advanced additive technology in direct metal laser sintering and precision casting method

The paper deals with analysis of samples made of Inconel 718 nickel superalloy, produced using direct metal laser sintering (DMLS), known as “sintering”, and precision casting technologies. The theoretical part is focused on the characteristics of producing samples of the nickel superalloy by modern additive methods (those for processing metallic materials) and by the conventional technology of precision casting. The practical part involves the investigation of the mechanical properties and texture of the surfaces of the tested samples. A significant part of this study is devoted to analysis of fracture surfaces and EDX experimental testing of TEM lamella by using of electron microscopy methods. The conclusions of this paper include a discussion, evaluation and explanation of both technologies applied on tested samples. Finally, the main benefits of using modern additive technologies in the design and production of heat-resistant components of turbochargers are discussed

Experimental determination of continuous cooling transformation diagram for high strength steel X155CrMoV12

The article is a result of investigations which deals with the phase transformations of tool steel X155CrMoV12. The experimental data obtained was used to evaluate the resulting Continuous Cooling Transform (CCT) diagram, which consists of seven dilation curves. All experimental samples from dilatometric analyzes were then subjected to microstructural analyzes and hardness measurements to characterize the microstructure and hardness for each heat treatment mode tested. Atomic Force Microscopy (AFM) microscopy was also used to study the carbides present in steels and their size and shape for all selected cooling modes.Web of Science61118818