Influence of Cu Addition and Microstructural Configuration on the Creep Resistance and Mechanical Properties of an Fe-Based alpha/alpha '/alpha '' Superalloy

Morales LA, Bezold A, Förner A, Holz H, Merle B, Neumeier S, Körner C, Zenk C (2023)

Publication Type: Journal article

Publication year: 2023

Journal

DOI: 10.1002/adem.202201652

Abstract

Introducing Cu nanoparticles is an effective mechanism for strengthening and toughening Fe-based materials such as ultra-high-strength steels. Herein, the effect of Cu on the mechanical properties of a novel Fe-based alpha/alpha '/alpha '' superalloy is studied. Compared to a Cu-free reference alloy, nanoindentation reveals an increase in hardness, which was associated with the formation of Cu nanoparticles. Both alloys show room temperature (RT) compressive plastic strain at maximum stress greater than 8%, irrespective of the heat-treatment. At RT and at 750 degrees C, the Cu-containing alloy exhibits a slightly higher strength, but the heat treatment has a more significant impact: A configuration of alpha-matrix and intermetallic alpha '/alpha ''-phases forming an interpenetrating network is superior to a state with isolated precipitates. This difference vanishes in monotonic creep experiments, and under the same conditions, the Cu-containing alloy exhibits a twice as high creep rate despite a slightly higher precipitate fraction. This is linked to a higher lattice misfit and faster-coarsening kinetics. Post-mortem transmission electron microscopy analysis of the creep-deformed specimens identifies dislocation bypass as the dominant deformation mechanism. However, the presence of {110} dislocations in the interfacial networks and evidence of dislocation activity within alpha '/alpha '' precipitates suggest the occurrence of shearing events.

Authors with CRIS profile

Andreas Bezold Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Andreas Förner Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Hendrik Holz Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Benoit Merle Technische Fakultät Steffen Neumeier Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Carolin Körner Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle) Christopher Zenk Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)

How to cite

APA:

Morales, L.A., Bezold, A., Förner, A., Holz, H., Merle, B., Neumeier, S.,... Zenk, C. (2023). Influence of Cu Addition and Microstructural Configuration on the Creep Resistance and Mechanical Properties of an Fe-Based alpha/alpha '/alpha '' Superalloy. Advanced Engineering Materials. https://dx.doi.org/10.1002/adem.202201652

MLA:

Morales, Luis Angel, et al. "Influence of Cu Addition and Microstructural Configuration on the Creep Resistance and Mechanical Properties of an Fe-Based alpha/alpha '/alpha '' Superalloy." Advanced Engineering Materials (2023).

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