Thermal response of iron and C-Mn steels with different ferrite/pearlite phase fraction under ultrasonic fatigue loading

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:749

Article

Pu, Xiaoxue¹  Petit, Johann¹  Darbord-Ranc, Isabelle¹  Wagner, Daniele¹ 

[1] Paris Nanterre Univ, LEME Lab, 50 Rue Sevres, F-92410 Ville Davray, France

关键词: Carbon-manganese steel;    Very High Cycle Fatigue (VHCF);    Self-heating;    intrinsic dissipation;    Dissipative mechanisms;    Ultrasonic fatigue testing;   

DOI  :  10.1016/j.msea.2019.02.017

来源: Elsevier

【 摘 要 】

This work compares the thermal responses of an a-iron and two carbon steels (C12 and C65 steel) via in-situ infrared thermography under 20 kHz ultrasonic tension-compression fatigue testing. The alpha-iron has only ferrite phase, and C12 and C65 steels have ferrite-pearlite dual phases. During a series of interrupted self-heating tests, the surface temperature of the three materials increases gradually with stress amplitude, while the relation is non-linear. The increase of carbon content, inducing the pearlite phase percentage increasing, results in a lower temperature increase and higher fatigue strength. For the three materials, at a certain stress amplitude level, the specimen temperature suddenly increases to hundreds of degrees. Moreover, the dissipated energy per cycle is estimated based on the 1D heat diffusion equation and a power function between dissipated energy per cycle and stress amplitude is found. Finally, the mechanisms driving the observed thermal responses are discussed.

【 授权许可】

Free