ANS:A - blades of gas turbines.

Creep consideration is most important in the case of the blades of gas turbines. Creep is the gradual and permanent deformation of materials under stress at elevated temperatures. In gas turbines, the blades are subjected to high temperatures and mechanical stresses due to the rotation and the high-speed flow of hot gases. These conditions can lead to creep deformation of the turbine blades over time. Gas turbine blades operate at high temperatures to achieve efficient energy conversion, and they are subjected to significant centrifugal forces and mechanical loads. The combination of high temperature and mechanical stress makes gas turbine blades particularly susceptible to creep deformation. Creep deformation in gas turbine blades can lead to dimensional changes, distortion, and ultimately, failure of the blades if not properly accounted for in their design and material selection. Therefore, creep consideration is crucial in ensuring the reliability, durability, and safe operation of gas turbine blades.