Sodium Loops for Material Behavior Testing In Flowing Sodium in KFK
Alkali metal corrosion can influence the mechanical high temperature properties of structural materials by changing their contents of interstitial elements (C, N, O). On the other hand liquid metals can also cause brittle behaviour of materials. The preceding tests (1) have demonstrated that sodium accelerates the crack propagation rate in creep rupture tests. Though sodium changes mainly surface near areas of the pipes the tests made before do not indicate a significant sodium influence on the fatigue life of stainless steel spacimens (2). To study the influence of proper liquid sodium environment on creep crack growth and on fatigue cracking behaviour, two new loops have been constructed, one of them connected to two fatigue testing systems, the other containing four creep rupture test sections.
KeywordsTest Section Crack Propagation Rate Cold Trap Creep Crack Growth Mechanical High Temperature Property
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