Hydrogen Compatibility of Structural Materials for Energy Storage and Transmission Applications. Semiannual Report, April 1, 1977--October 1, 1977.

摘要

A series of 80 self-loaded tensile specimens have been subjected to 821 cycles of hydride charging and discharging, while in intimate contact with the hydride powder and environment. No failures due to the environment occurred. Post exposure measurement of mechanical properties disclosed no degradation of mechanical properties, and no significant alteration of the fracture surface appearance in mild steel, aluminum and stainless alloys. These observations are explained in terms of delayed failure phenomena, and the conclusion reached that prototype vessel operation should be safe for significant numbers of cycles of operation. The experimental hydrogen pipeline began operation in September at 7 MPa pressure of hydrogen. Operating conditions are described. The initial defects and test matrices are discussed. Development of more hydrogen compatible mild steel alloys and microstructures is discussed and preliminary results on titanium modifications to A516 steel are presented. Protective coating work that has been completed is summarized: these efforts have been discontinued pending further evidence of the technical and economic viability of coatings in hydrogen energy systems. (ERA citation 03:025962)