Tensile Properties of Ti 7Al-4Mo Heavy-Section Forgings

摘要

In general, beta forging Ti 7Al-4Mo results in lower tensile properties, especially reduction in area. The best combination of annealed properties occurs on mill annealing followed by a single high (1700F) temperature anneal. The best combination of solution treated properties results from low temperature forging, followed by quenching from 1720F. Yield strength can be increased by quenching from higher temperatures. Over aging at 1250F results in a decrease in tensile and yield strengths, with a corresponding increase in ductility. Solution heat treat temperatures for alpha/beta forged material should not exceed 1720F. Ti 7Al-Mo, in general, is capable of higher solution treated and aged strengths than Ti 6Al-4V. (Author)