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MM: Fachverband Metall- und Materialphysik

MM 15: Hydrogen in metals III: Experiments

MM 15.4: Vortrag

Montag, 16. März 2015, 17:00–17:15, TC 006

HYDROGEN EMBRITTLEMENT IN AEROSPACE MATERIALS — •Sathiskumar Jothi, Nick Croft, and Stephen GR Brown — Swansea University, Swansea, UK

Microstructures play a prominent role in aerospace components which are typically made of high toughness, corrosion resistant and high strength structural polycrystalline metallic materials such as nickel and nickel based super alloys. Nickel and nickel based super alloys are made up of complex microstructures which are susceptible to delayed failure caused by absorption of hydrogen produced either during fabrication in manufacturing process (i.e electrodeposition, welding etc*) or during operational use under environmental conditions. Several catastrophic failures have occurred in nickel and nickel based super alloys due to intergranular as well transgranular hydrogen embrittlement (HE) and hydrogen stress cracking (HSC) not only in aerospace industries but also in many other engineering sectors. HE depends on many factors including hydrogen diffusion and segregation, microstructural morphology and defects, stresses and texture morphological behaviour. Under EU FP7 *MultiHy* project, we employed multiscale technique to investigate the influence of these factors in hydrogen embrittlement both computationally and experimentally. The studies provide insights on the influence of these factors and control it strategically to reduce the susceptibility of materials to hydrogen embrittlement