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23.06.2010 09:04 -
Доклад на д-р инж. Богомил Великов Колев относно нови високоазотни сплави публикуван на мевдународен конгрес б Украйна
3™ INTERNATIONAL CONFERENCE ON HIGH NITROGEN STEELS "HNS 93" Organized by INSTITUTE FOR METAL PHYSICS ACADEMY OF SCIENCES OF UKRAINE PROGRAM September 14.-16. 1993 KIEV UKRAINE
PRODUCTION OF Fe-3ASED N-ALLOYED CAST ALLOYS Bogomil Vellcoy Kolev. H.Sc-. Sofia. Bulgaria
The possibilities for producing N-alloyed deformable steels as well as foundry alloys (steels and cast Irons) are thoroghly investigated in the Institute for Metal Science and Technology, the present paper generally presents some of the results.achieved by the author, reported in above 60 scintific publications. 15 inventors certificates and other scintific and applied developments Ј1-4.6.9. 103. They enable the defining of the trends for the production of new Fe-based nitrogen alloys and on the basis of the structural changes and the resultant properties the enlarging of the knowledge in the fields of metal and material sciences and other related sciences, philosophy included Cl-43. Some of the problems about nitrogen alloying consist in the following: 1. Regarding nitrogen entrapment in the melt during crystallization Ј53- Suppose that according to Sieverts law "1" grams of total melt quantity conditionally assumed as 100 g crystallize at the moment of the first nitrogen buble release under a pressure of P . N sm concentration in solidified metal (P ) and in the liquid Pliq is: As initial N concentration is expressed by aquation /4/: I then the quantity of th.e crystallized melt at the moment of the first nitrogen buble release It G = 0 maximum N quantity will be released in the process of crystallization and the)
N will be in molecular form. If G = 1. i.e.the whole melt has crystallized, the release of free N will be prevented - defects. Therefore. it is necessary to create practical conditions under which G —
ВМРО-НИЕ ще приеме 400 нови члена до кра...
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© Из практиката на КПЮА
Изнесен доклад относно добиване на нови...
© Из практиката на КПЮА
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