Application of the CEN (European Committee for Standardization) small punch creep testing code of practice to a representative repair welded P91 pipe

Qualification of P91 welds through Small Punch creep testing

“…Creep curves derived using the Small Punch test technique show the classic curve shape (just as for base metal and service exposed material [12]) with Figs. 5a-5c showing some examples for the weld metal and the Fine and Coarse Grained HAZ from the base metal side of the weldment.…”

“…It can be seen that in all cases decreasing creep load leads to increased lifetimes, although in some tests these are admittedly rather short. Earlier work [12] has shown that a direct correlation between the results of the SP creep tests and uniaxial tests for both the base metal and service exposed materials cannot be achieved using a load/stress correlation factor of 1.4 (k SP = 1) in high stress, short term tests. In fact a value of k SP = 1.3 was required for a reasonable correlation for these test conditions.…”

A study on the evolution of the contact angle of small punch creep test of ductile materials

“…[25]. It should be noted that bending deformation is not negligible during the early stages of the creep deformation [32,33], at least with the geometry recommended by CEN, therefore, a suitable number of elements was included through the thickness of the specimen in order to accurately calculate the stress field in the specimen. The choice of the element size was based on the work of Ma et al [25] and the results obtained by implementing the described model, in terms of damage propagation, are comparable to those found in the literature [2,7,13,20,25].…”

Application of small punch creep testing to a thermally sprayed CoNiCrAlY bond coat

“…Nevertheless, a recent review [20] has indicated that SP creep testing can lead to consistent results providing jig and specimen geometry are carefully controlled. Hitherto, the SP test has been most widely used for assessing creep behaviour of bulk steels used in nuclear and conventional power plant [21] where its ability to characterise in-service materials using only a small volume of material has been of significant benefit. More recently, it has been shown capable of analysing different zones of weldments in both creep resistant steel [22] and a nickel-based alloy [23].…”