The maraging-steel blades of the Virgo super attenuator

The blades are crucial components of the Virgo super attenuators. The mater ial used for their construction is maraging steel, a low-carbon-content all oy with high ultimate tensile strength and low creep under stress. Young's modulus, the shear modulus, the Poisson ratio and the corresponding elastic energy-loss coefficients have been measured. The measurements have been pe rformed on specimens subjected to the same thermal treatments as those of e lements for the Virgo interferometer realized with maraging steel. In addit ion, anelastic properties of the material subjected to different thermal tr eatments have been measured. II has been found that, for a maraging-steel s tructure (one free of plastic deformation), which undergoes an excitation w ith flexural vibrations, the elastic energy-loss coefficient can vary over a wide range as a function of the thermal treatment of the material and it is dominated by the thermo-elastic effect. The main reason for such a great alteration is supposed to be the dependence of the thermal conductivity on the average sizes of the precipitate particles and their relative separati ons.