Relationships of plastic deformation of n-1 alloy in temperature conditions of design and afterdesign emergencies at atomic power stations with thermal neutron reactors

The research is concerned with alloy N-1 (Zr-1%Nb). The purpose of the paper is to expand an experimental base and to develop design models for forecasting of the deformation behaviour of the N-1 alloy a non-stationary thermal power loading in the range of high homologic temperatures with regard of oxidation. A method to determine a momentary plastic deformation at a rapid heating has been developed, models on non-isothermal creepage, grain growth, isothermal oxidation in the water vapour, strengthening and brittlement of oxidized specimens have been created. The displacement of polymorphic transformation boundaries at a rapid heating has been determined, relationships of the plastic deformation and evolution of structure in a wide temperature range, including before-melting temperatures have been set; data base on the oxidation effect in the water vapour upon mechanical characteristics of the N-1 alloy has been developed. The procedure of an auxiliary analysis of power and non-standard specimen have been developed. Results of research of the polymorphic transformation, high-temperature deformation with regard of oxidation have been introduced in the Research Institute of Inorganic Materials and Institute of Atomic Power. The field of application is modelling of transient and emergency processes at APS with thermal neutron reactorsAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio