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Phase Transformations in Nickel base Superalloy Inconel 718 during Cyclic Loading at High Temperature

Jambor M., Bokuvka O., Novy F., Trsko L., Belan J.

Production Engineering Archives

2017

Vol. 15

15--18

Nickel base superalloys are hi-tech materials intended for high temperature applications. This property owns a complex microstructure formed by matrix of Ni and variety of precipitates. The type, form and the amount of these phases significantly affect the resulting properties of these alloys. At sufficiently long exposure to high temperatures, the transformation phase can occur, which can lead to degradation of properties of these alloys. A cyclic plastic deformation can accelerate these changes, and they could occur at significantly lower temperatures or in shorter time of exposure. The aim of this study is to describe phase transformation, which can occur by a cyclic plastic deformation at high temperatures in nickel base superalloy Inconel 718.

Fractography analysis of Inconel 718 fatigued at 700°C

Jambor M., Belan J., Bokuvka O., Novy F.

Production Engineering Archives

2016

Vol. 13, No. 4

20--25

This work deals with the fractography analysis of nickel-base superalloy Inconel 718 fatigued at 700°C in air atmosphere in the high cycle region. During cyclic loading of this alloy at high temperatures some different mechanisms compared to cyclic loading at ambient temperature take place. Cyclic plastic deformation at high temperatures causes some structural changes, which could have some influence.