Mechanical properties are very much dependent on the maximum heat treatment temperature. With rising maximum temperature, ry and UTS decline and the fracture strain rises because of thetransformation of the fine a0 needles to a more coarse mixture of aand b. Overall best results are obtained after 2 h at 850 C, followedby furnace cooling, or 1 h at 940 C, air cooling and tempering for2 h at 650 C followed by air cooling. The results for all propertiesare well above ASTM Standards for forged (ASTM F1472) and castTi6Al4V (ASTM F1108). The importance of the initial microstructurecannot be stressed enough. Due to the very fine martensite, thekinetics are completely different as compared to treatment of equiaxed or heavily deformed microstructures. Consequently, application of standard heat treatments shows that these treatments donot lead to the usual or expected results. Due to the specific processconditions and hence specific microstructure, SLM produced partsneed to be treated differently than bulk alloy parts.