Maraging 300 Steel Subjected to Ultrasonic Fatigue Tests, at Room Temperature
Gonzalo M. Dominguez Almaraz
University of Michoacan (Umsnh)
Maraging 300 steel was tested under ultrasonic fatigue regime, at room temperature and under full reversed load ratio (R=-1), . Hourglass shape testing specimen dimensions were obtained by modal numerical simulation, using the mechanical proprieties of this steel: density, Young Modulus and Poisson ratio. Ultrasonic fatigue tests were performed under three loading stresses: 585, 486 and 389 MPa, corresponding to high, middle and low applied stress, respectively. Fracture surfaces were analyzed with scanning electronic microscope, in order to obtain the origin and causes of crack initiation and propagation under this testing conditions. Furthermore, general conclusions were addressed concerning the ultrasonic fatigue endurance of this aeronautical steel, together with the crack initiation and propagation behavior.