THE RISING-LOAD CANTILEVER TEST:A RAPID TEST FOR DETERMINING THE RESISTANCE OF HIGH-STRENGTH MATERIALS TO ENVIRONMENTAL CRACKING

摘要

It is considered that the procedures developed should provide a suitable routine screening test for estimating the EC susceptibilities of other high-strength materials.nResults from the rising-load cantilever test indicate that 18% Ni (250) maraging steel, in the presence of a sharp notch, is highly suscept¬ible to EC when cathodically protected at or near the potential provided by zinc (i.e., about -1060 mV SCE). Maximum resistance to EC was ob¬served in the rather narrow potential range of -700 to -750 mV.nResults from the rising-load cantilever tests are compared with constant-load cantilever tests and constant-load tests conducted on smooth cylindrical specimens axially loaded. The shortcomings of the latter test method are discussed.