Fabrication and mechanical properties of ods ferritic alloys canning tubes for fast reactor fuel pins.

The alloys are made through powder metallurgy methods and a matrix was first. It contains 13%Cr, 1. 5%Mo and 2 to 3% Ti which gives the alloy much improved high-temperature strength. Tensile test results are given as a function of temperature and axial creep data at 500 degree C to 700 degree C are presented. From these tests, the Y//2O//3 containing alloys appear to be slightly superior; both alloys are comparable to AISI 316 at 700 degree C; they are better at low stresses and at lower temperatures. A shallow minimum of ductility appears between 400 and 500 degree C but elongation remains always above 7% in tensile tests. Creep rupture ductility is larger than 5% and does not depend strongly on stress level (or time-to-rupture). Biaxial creep tests made by internally pressurizing the tubes are also presented in the same temperature range; they show a nearly complete independence of results to the rather strong fibrous texture of the fabricated tubes.