Accession Number : AD0729038

Title :   The Interaction of Molybdenum with Nitrogen and the Effect of Nitriding on the Properties of Molybdenum Alloys,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Kogan,Ya. D.

Report Date : 25 JUN 1971

Pagination or Media Count : 19

Abstract : The nitriding of molybdenum in an ammonia medium leads to the formation of diffusion nitride layers, the thickness of which depending on the temperature (up to 1130 degrees centigrade) obeys exponential law, and depending on the duration of the process - to parabolic law. The alloying of molybdenum with titanium, zirconium and carbon accelerates the diffusion of nitrogen. Nitriding considerably raises the surface microhardness, wear resistance and heat resistance of molybdenum. An optimum condition of nitriding of sheet molybdenum 1-1.5 mm thickness for increase in heat resistance in nitriding at 900-1000 degrees centigrade for 1 hr; for the increase in wear resistance - 1000 degrees centigrade for 3 hrs. Nitriding is accompanied by increase in the temperature threshold of brittleness, however for prescribed technological condition of saturation, which allows the obtaining of satisfactory plasticity at room temperature and considerable increase in heat resistance at temperatures 1000-1400 degrees centigrade. (Author)

Descriptors :   (*MOLYBDENUM ALLOYS, *CASE HARDENING), DIFFUSION, INTERACTIONS, REACTION KINETICS, WEAR RESISTANCE, TITANIUM ALLOYS, ZIRCONIUM ALLOYS, USSR

Subject Categories : Metallurgy and Metallography
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE