一、前言Ti-6Al-4V合金是美国于1954年首先研制成功的,它以良好的综合性能而著称。该合金与其它钛合金一样,热加工时易与氧、氢等气体发生作用,使板坯表面氧化和渗气,形成硬化层,不但给进一步加工造成严重困难,而且浪费了大量的金属。 I. INTRODUCTION Ti-6Al-4V alloy was first successfully developed by the United States in 1954 and is known for its good overall performance. The alloy, like other titanium alloys, is susceptible to gases such as oxygen and hydrogen during hot working to oxidize and ooze the slab surface and form a hardened layer, which not only causes serious difficulties for further processing but also wastes a large amount of metal.