Thermal response of DP600 dual-phase steel under ultrasonic fatigue loading

Noushin Torabian (1) , Véronique Favier (1) , Saeed Ziaei-Rad (2) , Justin Dirrenberger (1) , Frédéric Adamski (1) , Nicolas Ranc (1)

1 PIMM - Laboratoire Procédés et Ingénierie en Mécanique et Matériaux
2 Department of Mathematical Sciences [Isfahan]

The present work employed in situ infrared thermography to investigate the thermal response and dissipative mechanisms of a dual-phase steel under ultrasonic tension-compression fatigue testing. A classical thermal response occurred for stress amplitudes below 247 MPa but an abnormal thermal response was observed for stress amplitudes above 247 MPa, in that the temperature stabilized after a steep increase of up to 350 °C. The mean dissipated energy per cycle was estimated based on temperature measurements using the heat diffusion equation. The relationship between the mean dissipated energy per cycle and the stress amplitude was studied, and mechanisms related to the observed thermal response were discussed.

Mots clés: Ultrasonic fatigue; Infrared thermography; Dual-phase steel; Ferrite; Dissipative mechanisms; Dislocations

Domaines: Matériaux; Science des matériaux [cond-mat.mtrl-sci]; Matériaux; Mécanique [physics.med-ph]; Matériaux et structures en mécanique [physics.class-ph]; Mécanique des matériaux [physics.class-ph]; Mécanique des solides [physics.class-ph]; Mécanique des structures [physics.class-ph]; Thermique [physics.class-ph]; Vibrations [physics.class-ph]

Noushin Torabian, Véronique Favier, Saeed Ziaei-Rad, Justin Dirrenberger, Frédéric Adamski, et al.. Thermal response of DP600 dual-phase steel under ultrasonic fatigue loading. Materials Science and Engineering: A, 2016, 677, pp.97-105. ⟨10.1016/j.msea.2016.09.025⟩. ⟨hal-01377599⟩