The Effects of Fabrication Procedure on Properties of Ti-6al-6v-2sn-0.5fe-0.25cu

摘要

The following rules or practices must be observed in order to obtain optimum mechanical properties for the alloy. The final processing operation must impart at least 50% plastic reduction at temperatures below the beta-transus in order to minimize grain size and develop optimum mechanical properties (beta-transus=1760-1780F). Preliminary forging or forming operations may be performed at temperatures up to 2000F provided the above operation is followed. Backward extrusions must be formed at temperatures not to exceed 1750F. Forward extrusions must be formed at temperatures not to exceed 1725F. If for forming purposes (die filling, metal flow, etc.) it is necessary to form above the beta-transus temperature, water quenching must immediately follow hot working. Recommended heating time for hot working is 15 min/in. thickness at temperature. For development of optimum mechanical properties the following heat treatment procedure is recommended. Water quench from press or hammer following hot work at temperature above 1600F and age at 1050-1100F followed by air cool. Water quench from press or hammer following hot work at temperatures below beta-transus and solution treat at 1630-1680F for 1-1/2 hours, followed by water quench. Age at 1050-1100F for 4 hours followed by air cool.