PSI - Issue 18

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 18 (2019) 594–599

25th International Conference on Fracture and Structural Integrity Ultrasonic fatigue on the automotive steels: AISI/SAE 4140T and 1045 G.M. Dominguez Almaraz 1, *, J.A. Ruiz Vilchez 1 , Alexiane Dominguez 2 1 Facultad de Ingeniería Mecánica, Universidad Michoacana de San Nicolás de Hidalgo(UMSNH), Santiago Tapia No. 403, Col. Centro, Morelia, Michoacán, 58000, México 2 Université Paris-Sud 11, URF Sciences et Techniques, BCST: Biologie Chimie Sciences de la Terre, 15 Rue Georges Clemenceau, 91400 Orsay, France Abstract Ultrasonic fatigue tests were carried out on two automotive steels: AISI/SAE 4140T and 1045, to investigate the fatigue endurance of these materials and the mechanisms of crack initiation and propagation under this modality of loading. Tests were obtained at room temperature and without control of environmental humidity; the last parameter was maintained between 50 and 65%. Ultrasonic fatigue results show that the effect of non-metallic inclusions plays an important role in the decay of fatigue endurance for the 4140T steel, together with the effect of previous heat treatments. Concerning1045 steel, non-metallic inclusions play an important role too, but this time the temperature and variation of ductility with temperature induce an effect on the ultrasonic fatigue endurance. Finally, the fracture surfaces were analyzed in order to obtain the principal trends of crack initiation and propagation on these steels, under the ultrasonic loading modality. 25th International Conference on Fracture and Structural Integrity Ultrasonic fatigue on the automotive steels: AISI/SAE 4140T and 1045 G.M. Dominguez Almaraz 1, *, J.A. Ruiz Vilchez 1 , Alexiane Dominguez 2 1 Facultad de Ingeniería Mecánica, Universidad Michoac na de S n Nicolás de Hidalgo(UMSNH), Santiago Tapia No. 403, Col. Centro, Morelia, Michoacán, 58000, México 2 Université Paris-Sud 11, URF Sciences et Techniques, BCST: Biologie Chimie Sciences de la Terre, 15 Rue Georges Clemenceau, 91400 Orsay, France Abstract Ultrasonic fatigue tests were carried out on two automotive steels: AISI/SAE 4140T and 1045, to investigate the fatigue endurance of these materials and the mechanisms of crack initiation and propagation under this modality of loading. Tests were obtained at room temperature and without control of environmental humidity; the last parameter was maintained between 50 and 65%. Ultrasonic fatigue results show that the effect of non-metallic inclusions plays an important role in the decay of fatigue endurance for the 4140T steel, together with the effect of previous heat treatments. Concerning1045 steel, non-metallic inclusions play an important role too, but this time the temperature and variation of ductility with temperature induce an effect on the ultrasonic fatigue endurance. Finally, the fracture surfaces were analyzed in order to obtain the principal trends of crack initiation and propagation on these steels, under the ultrasonic loading modality.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo.

Keywords: Ultrasonic fatigue; Car steels; Non-metallic inclusions; Crack initiation and propagation; Fracture surfaces. Keywords: Ultrasonic fatigue; Car steels; Non-metallic inclusions; Crack initiation and propagation; Fracture surfaces.

1. Introduction The AISI SAE car steels 4140T and 1045, are two of the most popular steels in the car industry used in a variety of components. The 4140T is used in shafts, crankshafts, bolts/nuts, gears, milling spindles, collars, jigs, steel conveyor 1. Introduction The AISI SAE car steels 4140T and 1045, are two of the most popular steels in the car industry used in a variety of components. The 4140T is used in shafts, crankshafts, bolts/nuts, gears, milling spindles, collars, jigs, steel conveyor

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. * Corresponding author. Tel.:+52-443-3223500; fax: +52-443-3223500 ext. 3107 E-mail address: dalmaraz@umich.mx * Corresponding author. Tel.:+52-443-3223500; fax: +52-443-3223500 ext. 3107 E-mail address: dalmaraz@umich.mx

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 10.1016/j.prostr.2019.08.204