Accession Number : AD0709554

Title :   THE INFLUENCE OF COMPOSITION ON THE FRACTURE TOUGHNESS OF COMMERCIAL NUCLEAR VESSEL WELDS.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Steele,Lendell E.

Report Date : 23 JUN 1970

Pagination or Media Count : 22

Abstract : Irradiation studies of welds of the ASTM Type A302-B and A533-B steels, most commonly used for commercial water reactor vessels, demonstrated several instances in which the weld metal exhibited lower fracture toughness or greater elevation of the brittle-to-ductile transition temperature than that observed for the companion base-plate and weld heat-affected-zone material. Examination of the structure and composition led to the conclusion that composition is critical to the level of radiation-induced embrittlement. The level of copper and phosphorus contents has been shown to be especially critical to the level of embrittlement with welds having high copper (>0.20%) and phosphorus (>0.015%) showing greater embrittlement than those containing lesser amounts. These experimental observations were verified through laboratory tests in which these constituents and other residual elements were controlled in weldments simulating those for reactor service. (Author)

Descriptors :   (*NUCLEAR POWER PLANTS, PRESSURE VESSELS), (*PRESSURE VESSELS, EMBRITTLEMENT), METAL JOINTS, WELDS, FRACTURE(MECHANICS), TOUGHNESS, DAMAGE, RADIATION EFFECTS, STATISTICAL DATA

Subject Categories : Fission Reactor Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE