By G. N. Dubinin (auth.), G. V. Samsonov (eds.)
One of the best tools of accelerating the wear and tear resistance, hardness, floor energy and high-temperature oxidation resistance of metals and alloys is the diffusion satu ration of the surfaces through metals and nonmetals. For speaking and discussing the result of the various researches conducted during this box within the division of PJ:tysicotechnical difficulties of fabrics technological know-how, Academy of Sciences of the UkrSSR, an everlasting clinical Seminar used to be organize in 1961, which enjoys an ever-increasing attractiveness between experts during this box. the current assortment comprises papers learn on the 3rd consultation of this Seminar, hung on September 25-28, 1963. The compilers of the gathering and the authors of the papers desire that its ebook within the U. S. A. will let American experts to develop into familiar with the most strains alongside which corresponding paintings is being performed within the USSR. this could give a contribution to an ex switch of medical event during this fascinating box that is of such nice sensible impor tance. G. V. Samsonov PREFACE This assortment is made from papers when it comes to the diffusion saturation of metals and to coatings of refractory compounds. The papers talk about present difficulties within the idea and perform of the creation of diffusion coatings on steel fabrics. a method of classifying the equipment of diffusion saturation is proposed, and a brand new strategy is defined for calculating the diffusion parameters in a heterogeneous medium.
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Extra info for Diffusion Cladding of Metals
M. KRIVORUCHKO Fig. 5. Photomicrograph of siliconized tantalum (from top to bottom TaSi2 , Ta5Si3' Ta; the Ta5Si 3 phase penetrates to a considerable distance in TaSi2). phase gives reason to believe that it is produced within the TaSi 2 not as the result of precipitation but is formed on diffusion of the silicon on the Ta5Si3- TaSi2 interface. It follows from the observation made that in the diffusion saturation of tantalum with sili- con, lower silicides are first formed, and their transformation to higher silicides then occurs.
F- -/0 - ~. ::::: t".... :. 6 Depth of layer, min Fig. 3. 16%. The distribution of carbon in the diffusion layer with controlled supply of natural gas is mainly characterized by a smooth transition from the surface (Fig. 3). The presence of ammonia in the carburizer has a favorable effect on the character of the carbon distribution in the layer. STEELS CARBURIZED BY NATURAL GAS CONTAINING AMMONIA ~ > -; q ~ « 0 ~--:---~-~:---~-----:~--:' //I IV V VI VII I Heat tre~tme nt C:Qndh ions Fig. 4. Influence of ammonia on the abrasive wear of specimens of carburized steel 17N3MA under different conditions of carburization and subsequent heat treatment (rock, limestone).
Gluskin Zh. Tekhn. Fiz. 20:222 (1950). G. V. 1 (1959). E. A. ,J. Electrochem. , 98:1 (1951). E. Fitzer, Berg- und HUttenmaenn. Monatsh. Montan. Hochschule Leoben, 81:97 (1952). S. Mazumi and A. Toshimasa, J. Japan Inst. Metal 21:579 (1957). BOROAlUMINIZING OF IRON AND STEEL G. V. Zemskov and N. G. Kaidash Diffusion boriding and aluminizing are widely used in practice for imparting special P:roperties to surface layers on iron and steel [2, 7]. Drawbacks of boride layers are their high brittleness and low heat resistance.