Research on fracture behavior of a Cr coating/original steel substrate material under thermal fatigue loading

The facture behavior of a chromium (Cr) coating/ original steel substrate material was investigated in this work. The results presented in this work show the crack density of the Cr coating on the substrate increases with the increase of the thermal fatigue times, and the failure process and modes of the Cr coating /original steel substrate system can be described as follows: Firstly, the micro-cracks of the coating grew and interconnected as the thermal fatigue time increased. Secondly, the "pocket" cracking at the coating and the substrate interface occurred, and the main cracks of the coating formed. Finally, the spallation or (and) collapse of the coating occurred