Corrosion and microstructural analysis data for AISI 316L and AISI 347H stainless steels after exposure to a supercritical water environment
This article presents corrosion data and microstructural analysis data of austenitic stainless steels AISI 316L and AISI 347H exposed to supercritical water (25 MPa, 550 °C) with 2000 ppb of dissolved oxygen. The corrosion tests lasted a total of 1200 h but were interrupted at 600 h to allow measurements to be made. The microstructural data have been collected in the grain interior and at grain boundaries of the bulk of the materials and at the superficial oxide layer developed during the corrosion exposure.
Corrosion and Stress Corrosion Cracking Susceptibility of Type 347H Stainless Steel in Supercritical Water
The corrosion resistance and stress corrosion cracking (SCC) susceptibility of Type 347H stainless steel (SS) in supercritical water (SCW) were investigated. The general corrosion behavior was inve...
Influence of mechanical faults on electrical resistance in high voltage circuit breaker
Abstract The health of contact sets is one of the most critical factors for the breaking capacity of the high voltage circuit breaker. Dynamic resistance measurement is considered to be an effective method to assess the erosion degree of the contact sets. However, the electrical resistance may be influenced by many other mechanical faults which will cause the misdiagnosis of the contact sets. At present, the influence mechanism has not been clarified. Therefore, the influence mechanism and degree of mechanical faults (stress relaxation, fatigue, friction) of contact sets is studied in the present paper. Firstly, the accelerated stress relaxation experiments of CuW alloy, the fatigue experiments of contact sets, and the mechanical friction experiments are carried out to obtain the relationship between the fault degree and the electrical resistance. Secondly, the fatigue fracture, micromorphology, energy dispersive spectroscopy, and metal loss of the contact sets are investigated. Thirdly, the stress distribution and fatigue fracture of the contact finger is analyzed by the finite element method. Based on the above works, the fatigue damage, and the partial loss of the contact fingers are considered to be the most distinct influence on the electrical resistance curves.