Assessment of residual stresses in ITER CS helium inlet welds fatigue tested at cryogenic temperature
| Autor: | S. A. E. Langeslag, P. Fernandez Pison, C. Jong, Stefano Sgobba, Paul Libeyre, K. Freudenberg, I. Aviles Santillana, S. Castillo Rivero, D. Everitt |
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| Rok vydání: | 2019 |
| Předmět: |
Ingeniería Mecánica
geography Materials science geography.geographical_feature_category Cryogenics Welds Nuclear engineering Superconducting cables chemistry.chemical_element Mechanical properties Fatigue testing Inlet Helium Shot peening Residual stresses chemistry Residual stress Welding Cryogenic temperature |
| Zdroj: | e-Archivo. Repositorio Institucional de la Universidad Carlos III de Madrid instname e-Archivo: Repositorio Institucional de la Universidad Carlos III de Madrid Universidad Carlos III de Madrid (UC3M) |
| Popis: | Proceeding of: 27th International Cryogenic Engineering Conference and International Cryogenic Materials Conference 2018 (ICEC-ICMC 2018), September 3-7, 2018, Oxford, United Kingdom The ITER Central Solenoid (CS) consists of six independent wound modules. The cooling of the cable-in-conduit conductor is assured by a forced flow of supercritical He at 4.5 K supplied by He inlets located at the innermost radius of the coil. The inlets consist of a racetrack-shaped boss welded to the outer conduit wall through a full penetration Tungsten Inert Gas (TIG) weld. They are critical structural elements submitted to severe cyclic stresses due to the electro-magnetic forces acting on the coils. The weld contour is shape-optimised and locally processed by Ultrasonic Shot Peening (USP), conferring large compressive residual stresses on a subsurface layer of several millimetres thickness to improve fatigue strength. The distribution of the residual stresses and the effect of USP on microstructure and mechanical properties is assessed, with reference to the results of a cryogenic fatigue test campaign, performed on peened and as-welded inlets for comparison. |
| Databáze: | OpenAIRE |
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