Response of Nickel-Base Superalloys to Thermo-Mechanical Processing by Shock-Wave Deformation.

摘要

An investigation was conducted to study the synergistic effects of thermal treatment and explosive shock loading on the microstructure and mechanical properties of Udimet 700and Inconel 718. The influence of such shock thermomechanical processing (TMP) is compared with that of thermal processing alone,and with that of conventional TMP by cold rolling to an effective strain equivalent to the transient shock strain. The applied peak shock pressures were 527kbar for Udimet 700,and 510kbar for Inconel 718,with a 1-microsec duration,and the equivalent thickness reduction by rolling was 19.1% for both materials. In general,it was found that the most favorable TMP schedules are those which involve a partial aging treatment prior to cold working. The shock TMP of Udimet 700and Inconel 718resulted in improvements in room and elevated temperature strengths,elevated temperature ductility and toughness in the minimum ductility region,stress-rupture life,and low-cycle fatigue life. (Modified author abstract)