Hydrogen Resistance of Steels Alloyed with Nitrogen

We study the resistance of stainless steels with different contents of nitrogen after plasma-arc remelting to hydrogen degradation. The dependence of the mechanical properties of steels on the content of nitrogen is quite complicated, which is explained by changes in the phase composition. In the analyzed collection of steels (Kh18AN9, Kh20AN15, Kh18AG10, and Kh18AG15), Kh18AG15 steel has the best combination of the characteristics of strength and plasticity in hydrogen.     

Two-stage consolidation of silicon nitride under static gas pressure

Translated from Poroshkovaya Metallurgiya, No. 7(355), pp. 18–23, July, 1992.     

Compacting silicon nitride under the effect of high-pressure gas media

Translated from Poroshkovaya Metallurgiya, No. 4(340), pp. 44–48, April, 1991.     

Variation of the dispersion and phase composition of ultradispersed silicon nitride powders in annealing

Institute of Superhard Materials, Academy of Sciences of the Ukraine, Kiev. Translated from Poroshkovaya Metallurgiya, No. 3(363), pp. 8–13, March, 1993.     

Effect of dimensional laser machining on the structure and properties of silicon nitride

Translated from Poroshkovaya Metallurgiya, No. 4(328), pp. 85–89, April, 1990.     

High-temperature reaction between silicon carbide and nitrogen under pressure

The effects of temperature and nitrogen pressure are studied on the SiC Si₃N₄ transformation of silicon carbide powders of various phase compositions, specific surface areas, and contents of mixtures. It is shown that the degree of transformation increases with nitrogen pressure up to 10 MPa and that, in all temperature and pressure ranges of nitrogen, it is higher for bulk free powder than the preliminarily compacted material. In 30–60 min, a complete transformation of SiC into Si₃N₄ occurs under 10 MPa nitrogen pressure and at 1650–1750°C temperature.Institute of Inorganic Chemistry, Slovakian Academy of Sciences. Institute of Superhard Materials, Ukrainian Academy of Sciences, Kiev. Translated from Poroshkovaya Metallurgiya, No. 4(364), pp. 1–6, April, 1993.