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In the Memory of Professor Tsolo Rashev (1933–2019)

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Abstract—The paper outlines the biography of the outstanding metallurgical scientist and metallurgist of the 20th century, Professor Tsolo Rashev. His life was devoted to developing the metallurgic industry in Bulgaria, for the research and development of metallurgical processes associated with the production of nitrogen-containing and high-nitrogen steel grades of various structural classes and to studying properties of these steel grades. Since his personal life developed in sync with this scientific activity, the paper focuses on the main areas of his scientific endeavor. Tsolo Rashev carried out work on the thermodynamics and kinetics of the interaction of non-traditional alloying elements with metals and slag in liquid and solid state (including the study of nitrogen solubility in melts of various alloying systems based on iron). Dr. Rashev simulated metallurgical processes improving the technology and properties of resulting high-quality, special and high-nitrogen steel grades and alloys. He developed and implemented methods and devices for processing and obtaining steel grades and alloys, paying special attention to methods and designs to introduce and retain nitrogen in iron-based steel grades and alloys. The scientific contribution made by Prof. Tsolo Rashev is highly valuable.

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Notes

  1. Now the city regained its historical name—Yekaterinburg, and UPI became the Yeltsin Ural Federal University named after the first President of Russia.

  2. https://ru.wikipedia.org/wiki/Кремиковский_металлургический_ комбинат.

  3. Currently it is a National Research Technological University (NITU) MISiS.

  4. This is an equivalent of PhD (Engineering) in the USSR and later in Russia.

  5. Located: blvd. Shipchenski pass 67, 1574. Currently it has the title the Institute of Metallurgy, Structures and Technology reporting to the Balevsky center of hydrodynamics: (The Balevsky Institute for metal science, expressions and technologies from the Center for hydro- and ae- rodynamics Acad. A. Balevsky“:http://www.bas.bg/научни-изследвания/нанонауки-нови-материали/институт-по-металознание-съоръжения/).

  6. Nitrogen-containing steels are usually divided into two categories: — steels with an equilibrium nitrogen content; — steels with a non-equilibrium (super-equilibrium) nitrogen content. The former are obtained under conditions of solidifying the melt in air at atmospheric nitrogen pressure. On an industrial scale, the latter can be produced by smelting and crystallizing ingots under increased nitrogen pressure resulting in nitrogen content in the metal much higher than obtained through crystallization at 1 bar. It is the steel grades smelted and crystallized at pressure above atmospheric that are referred to as HNS—high nitrogen steel grades.

  7. This is an equivalent of Doctoral PhD (Engineering) in the USSR and later in Russia.

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Authors and Affiliations

  1. Baikov Institute of Metallurgy and Materials Science, RAS, 119991, Moscow, Russia

    M. V. Kostina

  2. Institute of Metal Science, Equipment and Technologies, Bulgarian Academy of Science, 1574, Sofia, Bulgaria

    L. Ts. Zhekova

Authors
  1. M. V. Kostina
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  2. L. Ts. Zhekova
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Correspondence to M. V. Kostina or L. Ts. Zhekova.

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Translated by V. Vetrov

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Kostina, M.V., Zhekova, L.T. In the Memory of Professor Tsolo Rashev (1933–2019). Steel Transl. 52, 54–58 (2022). https://doi.org/10.3103/S0967091222010144

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