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1 Advances in Materials Science

1 2007

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Stress corrosion cracking of the clad structural steel after its high temperature hydrogen degradation

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Lubińska K. , Tsyrulnyk O. , Herdil M. , Nykyforchyn H. , Kurzydłowski K. J.

tom Vol. 7, nr 1(11)

27-32

It is known that long term service of installations in energy and refinery industry in conditions of simultaneous action of loading and corrosion-hydrogen environments causes degradation of structural steels. This process of degradation is the most intensive on grain boundaries. Therefore structures with clad metal, namely, refinery shell, should be especially sensitive to degradation process. Three types of clad metal "low alloy steel/stainless steel" were studied: 15HM/304L, 516GR60/410S and 5l6GR70/N201. In-service degradation was modeled by thermocycling of specimens in the range of 25-550 st.C in hy-drogen atmosphere with fast rate of cooling. It allows to fix at law temperature such amount hydrogen in metal which is in equilibrium at high temperature and this is the reason of the intensive hydrogen degradation. Metal was tested after 30 and 100 thermocycles. Sensitiveness to hydrogen degradation was evaluated by slow strain rate tension of specimens during moderate cathodic polarisation. Same peculiarities of hydrogen cracking of clad metal were established and it was revealed that thermocycling in hydrogen atmosphere increases sensitivity of clad metals to hydrogen degradation. The degradation level depends on the type of clad metal and number of thermocycling.