Remaining life and fracture evaluation of Incoloy800H furnace tubes serviced at high temperature for 100,000h

摘要

This paper focuses on remaining life and fracture of an Incoloy800H furnace tube used to heat hydrogen circularly, which had serviced for 100,000h. The remaining life of the furnace tube was predicted Larson-Miller method based on creep rupture tests. It can continue to be serviced for about 10<'5>h at operating condition. The fracture property of the furnace tube was studied by measuring the high temperature fracture toughness of the serviced Incoloy800H alloy. Based on high temperature fracture toughness tests and the mechanical properties of the Incoloy800H alloy serviced for 100,000hrs at 680℃, high temperature failure assessment diagram was given and employed to assessment fracture of Incoloy800H furnace tube with defects for 100,000hrs at elevated temperature. The fracture assessment result indicates the serviced furnace tube with a defect is safe at assessment condition.