Heavy tungsten alloy (HTA) W-Ni-Fe-Co nanopowders synthesized by a chemical-metallurgical method are used to produce a compacted material with a theoretical density and a grain size of 2.9–4.6 μm. Upon solid-phase sintering (SPS) at 1350–1450°C, the binder composition of the produced material coincides with the binder composition of the alloy fabricated by liquid-phase sintering (LPS) according to a traditional technology. The hardness of the material is 4400–3400 MPa (as compared to 1750 ± 50 and 2950 ± 50 MPa after LPS followed by a hardening treatment for a standard HTA), and its ultimate tensile strength after SPS is 950–1050 MPa (as in the case of the standard alloy after LPS). The melting temperature of the binder is 25–30°C lower than that of the traditional alloy.

The structure and corrosion properties of two high-nitrogen 05Kh20AN8MF steels additionally alloyed with 9 and 17% Mn have been studied. Metallographic, X-ray diffraction, and fractographic studies show that both steels have an austenitic structure and high plasticity properties after quenching from 1100 and 1100°C and subsequent aging at 500°C for 2 h. The steel alloyed with 9% Mn and 0.58% V exhibit a higher strength. Both steels have a higher corrosion resistance in a 3.5% NaCl aqueous solution than 12Kh18N9T steel. After aging at 400–600°C, the corrosion rate and the sensitivity to stress corrosion cracking increase.

Specimens with V- and U-shaped notches made of austenitic high-nitrogen corrosion-resistant 05Kh20G10N3 AMF steel are subjected to impact tests in the temperature range from +20 to −196°C, and stress-

An X-ray diffraction method is developed for determining residual stress in the surface layers of metal samples characterized by a variable chemical composition across the layer depth. The method includes the determination of interplanar spacings for different diffraction reflections and the separation of the contributions to the interplanar spacing from elastic stresses and a solid-solution composition. The separation is based on the elastic anisotropies of the crystal lattices of metals with cubic and hexagonal structures. The efficiency of this method is demonstrated for EI961 and 12Kh18N10T steels and PT7M titanium alloy upon ion nitriding.

The structures of high-strength austenitic 04Kh22AG17N8M2F and 07Kh20AG9N8MF steels are studied after various heat-treatment conditions, and the relation between these structures and the mechanical and chemical properties of these steels is analyzed. The phase compositions of the steels, the morphology of phases, the fine structure of austenite, and the mechanism of its decomposition upon heating are investigated by X-ray diffraction and transmission electron microscopy. The homogeneous decomposition of the supersaturated γ solid solution in the 04Kh22AG17N8M2F steel at 500 °C is shown to be accompanied by the formation of the CrN nitride, which is isomorphic to the matrix, and to increase the strength and elastic stresses in the austenite, decreasing the stress corrosion cracking (SCC) resistance of the steel. Heating at 800 °C facilitates stress relaxation and increases the SCC resistance of the steel.

The structure and the mechanical properties of the high-strength structural martensitic steels used in manufacturing the mechanism parts subjected to significant cyclic dynamical loads are...