Tensile and Impact Behavior and Fracture Characteristics of FGH96 Powder Metallurgy Superalloy

Abstract:

Powder metallurgy (P/M) superalloy has not only been the primary material of turbine disk but also the main material of packing disk, packing ring and baffle plate of the aero-engine. Among these components, some parts are very thin, for example, the thinnest of baffle plate is only 2mm. The thin plate component was subjected to complex load, and the failure mode was synthetical. Some parts of component are subjected to impact load or impact-fatigue load although the nominal load of this component is fatigue load, more than one baffle plates have cracked through fast expansion and burst multiple debris because of the different local load type for the same component. It is very useful to investigate the effect on tensile and impact properties by specimen shape and shot peening. In this article, the different tests were carried out, including different specimen shape, temperature and surfaces. The results indicated that fracture strength σ_b and elongation δ₅ were not affected by shape of specimen of P/M superalloy. Rod or plate specimens may be used to characterize the static properties of material. Shot peening would decrease the elongation,δ₅ (at room temperature and 650°C) and impact work, but it did not reduce the fracture strength σ_b. In order to utilize adequately the component subjected to complicated loads, the surface state of the component may be treated distinctively according to the specific local load.

• Periodical: Applied Mechanics and Materials (Volumes 556-562)
• Pages: 389-394
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.556-562.389
• Online since: May 2014
• Authors: Xin Ling Liu*, Kai Zhao
• Keywords: Fracture Characteristics, Impact Property, Powder Metallurgy Superalloy, Shot Peening, Tensile Properties

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