Results 21 to 30 of about 417,880 (332)

Factors and mechanisms of nanomodification cement systems in the technological life cycle

open access: yesMagazine of Civil Engineering, 2022
The paper presents an analysis of the kinetics of heterogeneous processes and patterns of solid formation to substantiate factors and technological methods for nanomodifying the structure and properties of cement-based composites.
Artamonova Olga   +2 more
doaj   +1 more source

Nanoscale gold pillars strengthened through dislocation starvation [PDF]

open access: yes, 2006
It has been known for more than half a century that crystals can be made stronger by introducing defects into them, i.e., by strain-hardening. As the number of defects increases, their movement and multiplication is impeded, thus strengthening the ...
Greer, Julia R., Nix, William D.
core   +1 more source

The Hardening in Alloys and Composites and Its Examination with a Diffraction and Self-Consistent Model

open access: yesFatigue of Aircraft Structures, 2018
The paper presents the results of diffraction stress measurement in Al/SiC composite and in 2124T6 aluminum alloy during the in situ tensile test. The main aim of the work is to observe the stress values for different stages of tensile test for the ...
Gadalińska Elżbieta   +4 more
doaj   +1 more source

Mechanical Properties of Zirconium/Steel Bimetal Fabricated by Means of Explosive Welding at Varied Detonation Velocities

open access: yesArchives of Metallurgy and Materials, 2014
This paper assesses the effect of various values of detonation velocity on the quality of the bond zone, and thus the properties of bimetal zirconium (Zr 700) - steel (P355NL). The research was carried out for as-bonded welds, i.e.
Prażmowski M.
doaj   +1 more source

FEATURES OF FORMATION OF FUNCTIONAL COVERINGS AT ELECTROSPARK MODIFYING OF METAL MATERIALS

open access: yesВестник СибАДИ, 2017
Results of a research of influence of materials of the alloying electrodes at electrospark modifying of steel products on phase structure of the formed coverings and blankets are presented.
D. N. Korotaev, E. V. Ivanova
doaj   +1 more source

Impact of Volume and Surface Heat Treatment on the Structure and Properties of Steel 30HGSA

open access: yesҚарағанды университетінің хабаршысы. Физика сериясы, 2021
The work presents the results of a comparative study of volumetric and surface heat treatment impact on the structural-phase states, hardness, and wear resistance of steel 30HGSA. Surface hardening was conducted by the electrolyte-plasma method.
Б.К. Рахадилов   +6 more
doaj   +1 more source

A review of x-ray spectral evolution in Crab pulsar [PDF]

open access: yes, 2002
Pravdo et al (1997) claimed that the phase resolved x-ray spectrum in Crab pulsar (PSR B0531+21) shows a spectral hardening at the leading edge of the first peak of its integrated profile; this was a new and unexpected result.
Lundgren   +8 more
core   +2 more sources

A Modified Johnson–Cook Model to Predict Stress-strain Curves of Boron Steel Sheets at Elevated and Cooling Temperatures

open access: yesHigh Temperature Materials and Processes, 2012
In order to predict correctly stress-strain curve for tensile tests at elevated and cooling temperatures, a modification of a Johnson–Cook (J-C) model and a new method to determine (J-C) material parameters are proposed.
Duc-Toan Nguyen   +4 more
doaj   +1 more source

RESTORATION OF THE CONSTRUCTION AND ROAD MACHINES’ DETAILS FROM GREY CAST IRON: IMPROVEMENT OF THE REPAIR DIMENSIONS’ METHOD EFFICIENCY

open access: yesВестник СибАДИ, 2019
Introduction. The total mass of some grey cast iron details in construction and road machines reaches 60%. Cylinder blocks, parts of braking systems, flywheels, etc. are made of cast-iron.
V. E. Ovsyannikov, V. I. Vasilyev
doaj   +1 more source

Chemical heterogeneity as a factor of improving the strength of steels manufactured by selective laser melting technology

open access: yesЗаписки Горного института, 2020
The aim of this paper was to establish the causes of the heterogeneity of the chemical composition of the metal obtained by the LC technology. The powdered raw material was made from a monolithic alloy, which was fused by the SLM, the initial raw ...
Vadim I. ALEKSEEV   +2 more
doaj   +1 more source

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