Thermomechanical Processing of Nickel Base Alloy AF2-1DA Using Shock Wave Deformation.

摘要

An investigation was conducted to study the effects of shock wave deformation and heat treatment on the mechanical properties of nickel base superalloy AF2-1DA. Shock wave deformation having a transient volume strain of 23.6% was generated by an explosively induced 500 Kbar shock wave. The shock wave deformation was introduced to AF2-1DA plates in the solution treated condition and after various solution treatments and gamma prime heat treatments. Carbide and/or final aging heat treatments were conducted after shock wave deformation processing. For comparison and evaluation of results AF2-1DA plates from the same lot of material were thermally processed using the standard solution treatment and aging sequences. Tensile, stress-rupture, and low cycle fatigue testing was conducted on shock wave processed and thermally processed samples. In general the result was to increase the yield strength by up to 15% and the tensile strength by 3-5% at the 1400 F test temperature for the shock wave processed alloy relative to the thermally processed alloy. This strength increase was accomplished with a 7% increase in elongation and 20% increase in the reduction of area. Such increases indicate a substantial increase in toughness of the shock wave processed alloy. The increase in toughness of the shock wave processed material was manifested by measured improvements in the stress-rupture life and the low cycle fatigue life.