Dynamically recrystallized microstructures, textures, and tensile properties of a hot worked high-Mn steel

The deformation microstructures and mechanical properties were studied in a high-Mn steel subjected to hot compression. The deformation microstructures resulted from the development of dynamic recrystallization (DRX). Two DRX mechanisms, namely discontinuous and continuous, operated during warm-to-hot workin

Microstructure and impact toughness of high-strength low-alloy steel after tempforming

The effects of temperature and degree of tempforming deformation on the microstructure and impact toughness of high-strength low-alloy 25KhGMT steel have been considered. Tempforming forms a lamellar microstructure composed of grains and subgrains that are strongly elongated along the rolling directio

Peculiarities of DRX in a highly-alloyed austenitic stainless steel

The features of discontinuous dynamic recrystallization (DRX) in a highly-alloyed austenitic stainless steel were studied at temperatures of 800 °C to 1100 °C. Hot deformation accompanied by DRX was characterized by an activation energy of 415 kJ/mo

National cultural characteristics of the Khanty’s communicative behavior in stimulating speech acts

The scientific article for the first time presents a study of the ways of expressing motives on the material of the Khanty language. These methods are comprehensively analyzed in specific communicative situations used by the speaker and addressed to the listener. The imperative paradigm in speech constructs includes word forms of the verbal lexeme, expressing an imperative meaning addressed to the listener. As a result of linguistic analysis of such speech acts, it is revealed that the speaker’s will regarding the execution of the called action is expressed regardless of who performs the action: the listener, the speaker, the person not participating in the speech act, or any combination of the listed persons. The main (nuclear) way of expressing an impulse is an imperative construct

The effect of wear-resistant coatings composition based on niobium nitride on the structural parameters, mechanical properties and efficiency of the cutting tool

Single-layer wear-resistant coatings based on niobium nitride deposited on a carbide cutting tool are considered in this article. The influence of one and two alloying elements on the change of the coating structure, mechanical properties and efficiency of the cutting tool was studied. It was revealed that in all cases, alloying with titanium, zirconium, aluminum and chromium leads to a change in the microstructure and an increase in the mechanical properties of the coatings and the inclusion of two elements into the composition of coatings increases mechanical properties to a greater extent. Research has shown that cutting tools with coatings based on niobium nitride are characterized by a decrease in the stress state of the tool base and an increase in the total compressive stresses in the coating. Compared to titanium nitride, the niobium nitride coating reduces the temperature on the front surface of the cutting tool, but for complex-alloy coatings, there is a slight increase in contact temperatures. Changing the heat-stressed state and increasing the mechanical properties leads to an increase in the crack resistance of such coatings. It is shown that the use of developed compositions of multi-element coatings can improve the efficiency of the cutting tool. © Published under licence by IOP Publishing Ltd

Grain boundary assembly in a 316 L steel produced by selective laser melting and annealing

The effect of recrystallization annealing on the grain boundary assembly of a 316 L-type austenitic stainless steel produced by selective laser melting was studie

Paragraph: A graph-based structural variant genotyper for short-read sequence data

Accurate detection and genotyping of structural variations (SVs) from short-read data is a long-standing area of development in genomics research and clinical sequencing pipelines. We introduce Paragraph, an accurate genotyper that models SVs using sequence graphs and SV annotations. We demonstrate the accuracy of Paragraph on whole-genome sequence data from three samples using long-read SV calls as the truth set, and then apply Paragraph at scale to a cohort of 100 short-read sequenced samples of diverse ancestry. Our analysis shows that Paragraph has better accuracy than other existing genotypers and can be applied to population-scale studies. © 2019 The Author(s)

Effect of multiple forging and annealing on microstructure and mechanical properties of a high-manganese steel

The effect of multiple forging and annealing on the microstructure and mechanical properties of a high-manganese steel is considered. An austenitic high-manganese steel, Fe-0.03C-28Mn-1.5Al (all in wt.%), with an average grain size of about 37 qm was used as th initial material in this study. Multiple forging at room temperature was carried out up to a total true strain of 2. Multiple forging was accompanied by deformation twinning and resulted in significant strengthening. The steel samples subjected to multiple forging demonstrate an increase in the strength properties with an increase in the total strain, while elongation decrease

The Microstructure and Strength of UFG 6060 alloy after superplastic deformation at a lower homologous temperature

The paper reports on the features of low-temperature superplasticity of the heat-treatable aluminum Al-Mg-Si alloy in the ultrafine-grained state at temperatures below 0.5 times the melting point as well as on its post-deformation microstructure and tensile strengt

Prospects for usage of predatory mite Neoseiulus californicus (MCGREGOR, 1954) (order Mesostigmata: subfamily, Amblyseiinae, family Phytoseiidae)

The predatory mite Neoseiulus californicus (MCGREGOR, 1954) is used as a specialized acariphage on vegetable, flower and berry crops. In protected ground, N. californicus is one of the effective carnivores of spider mites (Tetranychidae), the intensity of attacks depends on the temperature. The predator prefers to consume immature individuals of T. uirticae, often ignoring adult female mites. Simultaneously, predaceous organism does not express preferences between eggs and T. urticae nymphs. However, as the density of the spider mite population increases, the predatory mite shifts its diet from the eggs of the victim to larvae and nymphs. Adult females N. californicus exhibit a type 2 functional response to both eggs and T. urticae nymphs. Pyrethroid and avermectin drugs are highly toxic to predator populations. At the same time, there is low acute toxicity to many insecticides (Actara, Envidor, etc.) is exibited