PSI - Issue 60

Sarath Chandran Nair S. et al. / Procedia Structural Integrity 60 (2024) 564–574 Sarath Chandran Nair S./ Structural Integrity Procedia 00 (2023) 000 – 000

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Table 4. Qualification test plan for Nickel and Chromium coating

Total stain

Test temperature

No. of cycles

Tensile

Compressive

Room temperature

0.3% 0.2%

0.2% 1.5%

1

820 K

15

A cylindrical LCF test specimens of Cu-Cr-Zr-Ti alloy employed for the test with a gauge diameter of 10mm. Specimens is made as per ASTM 606 [9]. Test specimen details are shown in fig. 4. Specimen gauge diameter is 10mm and gauge length is 20mm. Overall length of the specimen is reduced to take care of buckling during compressive loading. Fillet radius of 40mm is provided to reduce stress concentration at transition of specimen diameter. Coating is done on the specimen at the gauge length and fillet region. Specimen coated with Ni and chromium is shown in fig. 5.

Fig. 4. Configuration of test specimen

Fig. 5. Test specimen coated with Nickel and Chromium

4.3. Test setup Tensile and compression tests were done in a creep test machine in LPSC which is capable to do fatigue test. The machine is capable of conducting high temperature tests at 1200C with induction heating method with rated load of 30kN. Test can be done in extension/load/strain controls. The actuator is driven by a servo electric control and is in closed loop during strain control test. Test is done in vacuum to avoid oxidation at high temperature. Tests in this case are done by strain control method and strain during the test is monitored/recorded with the help of a dynamic extensometer. Load is measured by a 100kN capacity dynamic load cell. Test machine and specimen mounted in the machine are shown in fig. 6.