Effect of Intermediate Annealing on the Structure, Phase Composition and Properties of Cold-Rolled Foil from Hydrogen-Alloyed Alloy VT22I Under Aging

Abstract

The methods of electron microscopy, x-ray diffraction, and measurement of microhardness are used to study the effect of intermediate annealing on the structure and properties of cold-rolled foil from hydrogen-alloyed alloy VT22I under aging at 350 – 500°C. It is shown that growth in the hydrogen content causes deceleration of the processes of decomposition of the β-phase under aging. Amode of thermomechanical treatment is suggested for fabricating foils from alloy VT22I with 0.25 wt.% H. The treatment includes cold rolling with intermediate annealing at 650 – 700°C and final aging at 450°C for 8 h and provides a high microhardness (about 6400 MPa).