Accession Number : AD0636676

Title :   NITRIDING OF TITANIUM ALLOYS AT REDUCED PRESSURES.

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Novikova, E. V.

Report Date : 23 MAY 1966

Pagination or Media Count : 14

Abstract : A reduction in pressure in chamber at the nitriding of titanium alloys from 760 to 1 - 0.1 mm Hg leads to an increase in depth of the nitrided layer by 1.5 to 2.0 times. The thickness of the brittle nitrided zone decreases by several times. It was established that for each titanium alloy, at same temperature and nitriding duration conditions, there should exist definite pressures and nitrogen consumption at which it is possible to obtain a maximum depth of the layer. The layer obtained in rarefied nitrogen has good wear resistance and is not inferior to the layer obtained by nitriding in normal pressure. Mechanical characteristics of sample core of VT4 alloy, after nitriding in rarefied nitrogen, differs little from the nature obtained on samples nitrided at normal pressures (strength limit and impact ductility increase somewhat; relative elongation and narrowing remain practically the same). (Author)

Descriptors :   (*CASE HARDENING, *TITANIUM ALLOYS), PRESSURE, USSR, THICKNESS, NITROGEN, WEAR RESISTANCE, CONTROLLED ATMOSPHERES

Subject Categories : Metallurgy and Metallography
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE