PSI - Issue 3

A. Strafella et al. / Procedia Structural Integrity 3 (2017) 484–497 A. Strafella, A. Coglitore, E. Salernitano / Structural Integrity Procedia 00 (2017) 000–000

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3.2 Creep curves in lead

For its particular application on nuclear field, 15-15Ti(Si) was tested in lead in order to conduct a preliminary study on its lead corrosion sensitivity. Generally, the same conditions chosen for the test in air were used. One of the most important tests in lead was performed using the following parameters, that are the conditions for which the creep test in air reached the rupture:

T= 550°C

• •

σ = 560MPa To date, this test is still in progress: the strain is 0.5% and the test duration is 800h, as depicted in Figure 8.

Creep Strain %-560MPa-Pb

0,6

T= 550°C in lead

0,4

0,2 Creep Strain [%]

0 100 200 300 400 500 600 700 800 900 0,0

Time [h]

Fig. 8. Creep curve of specimen tested at 560MPa in lead.

It can be observed that, as well as the test in air, at this stress value primary and secondary phases of creep can be recognized and the calculation of sscr was possible. Creep curve obtained from the test on specimen in air was compared with that obtained in lead. The comparison between creep curve in air and in lead at 560MPa is depicted in Figure 9.

Fig. 9. Comparison of 15-15Ti(Si) creep curves in air and in lead. 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 0,0 0,2 0,4 0,6 0,8 1,0 1,2 1,4 1,6 1,8 2,0 2,2 T= 550°C Creep Strain [%] Time [h] Creep Strain % - [560 MPa] Creep Strain % - [560MPa]-Pb