Cavitation damage in liquid sodium by vibratory method, (4)

Experiments on cavitation damage in liquid sodium were carried out by using the vibratory method to obtain preliminary data and evaluate the behaviour of cavitation damage of primary or secondary components in LMFBR's. In this work many kinds of metals which were expected to be used as the candidate of material of the compornents and structure spars, were examined and compared each other concerning with cavitation damage. The sodium temperature were 250 deg C and 500 deg C, and the sodium pressure was ranged from 0 up to 5 kg/cm2 G. As the condition of vibration method, the frequency was about 16 KHz and the double amplitude was 40 μm. The metals in this experiments were SUS 304, SUS 316 SUS 316L, Inconel 600 and Stellite 6B. The test results are summarized as followings. (1) SUS 304, SUS 316 and SUS 316L have the same tendencies concerning with cavitation damage. We can not find the deferences among these metals. (2) The behaviours of cavitation damage of Inconel 600 at 250 deg C are the same as the above metals, but the amount of cavitation damage of Inconel 600 at 500 deg C and high pressure is the half of those of SUS metals at the same experimental conditions. (3) The amount of cavitation damage of Stellite 6B is ranged from 1/10 up to 1/5 of those of SUS metals. It is confirmed that Stellite 6B is strongest to the cavitation damage among the metals which were examined in this work. (author)