Effect of heat treatment on the strength and tribotechnical properties of material of LNKhB grade

Conclusions The Nichrome alloy was alloyed with niobium to produce the materials of the LNKhB7 and LNKhB8 grades with a heterogeneous structure which consist of an alloyed solid solution and nickel and a high-hardness phase, i.e., molybdenum carbide. Heat treatment (normalizing, aging) greatly hardens the material as a result of the formation of the high-hardness phase (Ni₃Al).The materials hardened with the high-hardness molybdenum carbide and the phase have high and stable strength properties in the temperature range 20–700°C (800°C); at temperatures higher than the temperature of hardening heat treatment the strength properties of the materials rapidly decrease.Alloying the grade LNKhB materials with niobium greatly improves the tribotechnical characteristics as a result of the formation of a surface film in the form of complex compounds on the friction surfaces.Translated from Poroshkovaya Metallurgiya, No. 7(283), pp. 74–77, July, 1986.     

New refractory materials for the aluminum industry

A technology for production of andalusite-based refractory components for the lining of anode firing kilns is described. The formulation for a low-cement castable resistant to attack by molten aluminum is proposed. __________ Translated from Novye Ogneupory, No. 4, pp. 109–111, April, 2006. Based on materials reported to the conference “Aluminum of Siberia-2005.”     

Structure and mechanical properties of alloys Ti-2.2% Al-2.2% V-2.2% Mo-2.5% Fe and Ti-2.2% Al-5% Fe equivalent to alloy VT16

Comparative studies of the structure and properties of alloys Ti-2.2% Al-5% Fe and Ti-2.2% Al-2.2% V-2.2% Mo-2.5% Fe in annealed, quenched, and aged conditions are performed. The strength level of the alloys corresponds to that of VT16. The possibility of replacing alloy VT16 by alloy Ti-2.2% Al-2.2% V-2.2% Mo-2.5% Fe is estimated. __________ Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 10–13, June, 2006.     

High-strength carbon steels with hereditary fine crystal structure I. The effect of vibrogrinding on the parameters of the fine structure of iron powder particles

Conclusions We investigated the dependence of the specific Surface and of the parameters of the fine structure of powdered pure iron on the duration of vibrogrinding and their change in the process of reduction. It was shown that this is accompanied during the first 15–30 h as a result of deformation polygonization by the formation of a block structure. When ground powders are reduced, processes of polygonization occur intensively; however, regardless of that, the defectiveness of the crystal structure of the metal remains high, and this apparently is bound to have a substantial influence on the processes of dissolving carbon and structurization during the sintering of pellets.Deceased.Translated from Poroshkovaya Metallurgiya, No. 6(282), pp. 46–51, June, 1986.     

Features of the Fine Structure of Ferrite in Hot-Work Die Powder Steels. II. Influence of Temperature of Heating for Drop-Forging on Fine Structure of Ferrite in Different Layers of Samples of Powder Chromium Steel

The influence of the temperature of heating for drop-forging on the fine structure of the ferrite of powder steel Kh17 is investigated. On the basis of structural characteristics obtained from different drop-forging sites by means of harmonic analysis, substantial differences in the degree of structural defectiveness in the crystal lattice between the outer faces and an internal layer of the samples has been established. The highest degree of structural defectiveness is found in the structure of the outer faces following heating for drop-forging to 1050 °C while a uniform structure throughout the drop-forging volume is created following heating to 1100 °C.     

The Structure and Phase Composition Acquired by Fe–Ti–Ni–C Alloys in Thermal Synthesis

Powder Metallurgy and Metal Ceramics - The structure and phase composition of Fe–Ti–Ni–C alloys produced in situ by thermal synthesis at 1200°C using TiH2, Fe, graphite, and...