Study on the Endurance Strength of Friction Welding Joint of Super304H Austenitic Heat Resistant Steel
Author of the article:HE Yu;WANG Jiao;LU Yuan;LI Debiao;ZHANG Jianlong;SUN Fuyang
Author's Workplace：Xi'an Special Equipment Inspection Institute,Xi'an 710065,China
Key Words：friction welding endurance strength Super304H
Abstract：
Use "isothermal method" on Super304 H austenitic heat resistant steel friction welding joint 625 ℃ extrapolation of the endurance strength test data and show that welding joints in the ultra supercritical unit working environment was safe and reliable service. The results show that the fracture of the sample is mainly dimple fracture and transgranular fracture under high stress. Under low stress condition, the specimen fracture is mainly dissociation fracture, mainly creep fracture.Creep fracture is based on nucleation and growth of pores and microcracks. Precipitation strengthening is the main strengthening method of Super304 H austenite heat resistant steel welded joints.
