Effect of heat treatment and impurity concentration on some mechanical properties of V-15Cr-5Ti alloy

Abstract

The effects of heat treatment and O, N, C, Si, and S impurity level on the yield strength, ductility, and fracture mode for specimens from four different heats of the V-15Cr-5Ti alloy are presented. The heat treatments for the alloy consisted of annealing as-rolled material for one hour at either 950, 1050, 1125, or 1200°C. The total oxygen, nitrogen, and carbon impurity concentration ranged fro 0.040 to 0.120 wt%. The Si concentration ranged from 300 to 1050 wppm, and the S concentration ranged from 0.044 to 0.110 wt%. The yield strength and ductility for the alloy, regardless of impurity concentration, exhibited minimum and maximum values, respectively, for the 1125°C anneal. The primary mode of failure for the tensile specimens was transgranular ductile fracture.