Fracture Analysis on Round-linked Chain of Ultra-supercritical Boiler Slag Conveyor

Fracture reason for round-linked chain of ultra-supercritical boiler slag conveyor was analyzed by means of physical and chemical testing methods,and the distribution of the carburized layer on fracture surface showed an open crack from the circumferential surface to inside had already existed that was the fundamental reason for the fracture of circular chain.Meanwhile,ANSYS finite element analysis method was employed to simulate the stress distribution law before and after the fracture,and the results showed the maximum tension stress in the position of defect due to the processing of manufacture was 5.5 times of that designed for material fracture.After fracture happened in the manufacture defect of the straight-edge section of circular ring,maximum tension stress distributed in the inner side between circular and straight-edge sections,in agreement of the final actual fracture position.