抄録
Research and development at National Research Institute for Metals on structural materials for cryogenic use are described. The R & D are made up of development of new structural materials, testing technology at cryogenic temperatures and production and evaluation of materials data.
Newly developed ferrous materials are 13% Nickel ferritic iron alloys and precipitation strengthened austenitic iron alloys. The strength of these materials is higher than that of the usual ones at lower temperatures. Several suitable materials are also found among titanium alloys.
A simplified method for Charpy impact testing near liquid helium temperature was devised. At present, fatigue test facilities at liquid helium temperature are under construction and in the near future, the evaluation of life of materials will be started.
Materials data base is regarded as a key for cryogenic technology and the study is recently undertaken as one of important projects. These basic research on structural materials are carried out comprehensively in order to make extensive contribution to cryogenic science the technology.
