Abstract
Within the framework of the German Fast Breeder Program static load tests in sodium were carried out on structural materials with the purpose of investigating the self-welding tendency of these materials. Besides austenitic materials also a stabilized ferritic steel and a nickel base alloy as well as several hard facing and hard metal alloys were used in the tests. The test temperatures were 580 and 700°C, the compressive load ranged up to 5 kp/mm 2 and the test lasted for 168 hr. The oxygen content of the cold-trapped sodium was nearly 20 ppm. The results show a more or less pronounced tendency of all the materials to weld together. While the austenitic and ferritic steels showed a marked tendency to weld together at 700°C the behavior of the hard facing and the hard metal alloys is not uniform. The nickel base alloy, which up to now has been investigated in one experiment only, does not weld together — with one exception. Micrographs made of some different material couples seem to indicate that the welding was caused by recrystallization after previous strong deformation of the contact region.
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