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Emilie Herny
Abstract
Mechanical characterization and investigation of thermal and thermomachanical ageing mechanisms of the electron beam welded martensitic stainless steel 15-5PH.
Emilie Herny - 8 December 2006
In aircraft industry, 15-5PH precipitation hardening martensitic stainless steel is used to manufacture structural parts susceptible to thermal and thermomechanical ageing in service. The objective to the study is to characterize the mechanical properties of the electron beam welded steel after ageing. The microstructural investigations of the aged alloy allow to identify the mechanisms responsible for the degradation of the mechanical properties. The spinodal decomposition of the martensite is at the origin of the embrittlement. Ageing tests under applied stress tests have been performed to evaluate the effect of stress on the ageing kinetics and to identify the microstructural mechanisms involved. Finally, the level of understanding reached at the end of the study, allows to suggest corrective actions to avoid the detrimental effect of ageing.
Keywords :
15-5PH stainless steel, ageing, embrittlement, electron beam
welding, spinodal decomposition
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