Local Mechanical Properties at the Dendrite Scale of Ni-Based Superalloys Studied by Advanced High Temperature Indentation Creep and Micropillar Compression Tests

Haußmann L, Neumeier S, Kolb M, Ast J, Mohanty G, Michler J, Göken M (2020)

Publication Type: Conference contribution

Publication year: 2020

Publisher: Springer Science and Business Media Deutschland GmbH

Pages Range: 273-281

Conference Proceedings Title: Minerals, Metals and Materials Series

Event location: Seven Springs, PA US

ISBN: 9783030518332

DOI: 10.1007/978-3-030-51834-9_26

Abstract

Chemical inhomogenities due to dendritic solidification of Ni-based superalloys result in different local microstructures with varying mechanical properties. New indentation creep test methods allow probing of the local creep properties at the dendrite scale at high temperatures. The as-cast single crystalline Ni-based superalloy ERBO1A (a derivative alloy of CMSX–4) was investigated and electron-probe microanalysis (EPMA) measurements revealed strong segregation of, e.g., Re and W in the dendritic region and, e.g., Ta in the interdendritic region. Indentation creep experiments at 750 °C and micropillar compression tests at 785 °C were conducted in both regions, and a higher creep strength was found in the dendritic region compared to the interdendritic region. Theoretical models for solid solution hardening as well as γ′ precipitation hardening confirm these results, since they predict a higher strength in the dendritic region than in the interdendritic region. Compared with the fully heat treated state, a smaller difference in the local mechanical properties or even a reverse strength ratio of the dendritic and interdendritic region can be expected.

Authors with CRIS profile

Lukas Haußmann Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Steffen Neumeier Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Markus Kolb Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Mathias Göken Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Additional Organisation(s)

Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Related research project(s)

A06 (FP3): Miko- und nanomechanische Charakterisierung von Superlegierungen bei hohen Temperaturen (SFB/TRR 103) SFB/TRR 103 Jan. 1, 2020 - Dec. 31, 2023

Involved external institutions

Eidgenössische Materialprüfungs- und Forschungsanstalt (Empa) / Swiss Federal Laboratories for Materials Science & Technology CH Switzerland (CH)

How to cite

APA:

Haußmann, L., Neumeier, S., Kolb, M., Ast, J., Mohanty, G., Michler, J., & Göken, M. (2020). Local Mechanical Properties at the Dendrite Scale of Ni-Based Superalloys Studied by Advanced High Temperature Indentation Creep and Micropillar Compression Tests. In Sammy Tin, Mark Hardy, Justin Clews, Jonathan Cormier, Qiang Feng, John Marcin, Chris O'Brien, Akane Suzuki (Eds.), Minerals, Metals and Materials Series (pp. 273-281). Seven Springs, PA, US: Springer Science and Business Media Deutschland GmbH.

MLA:

Haußmann, Lukas, et al. "Local Mechanical Properties at the Dendrite Scale of Ni-Based Superalloys Studied by Advanced High Temperature Indentation Creep and Micropillar Compression Tests." Proceedings of the 14th International Symposium on Superalloys, Superalloys 2021, Seven Springs, PA Ed. Sammy Tin, Mark Hardy, Justin Clews, Jonathan Cormier, Qiang Feng, John Marcin, Chris O'Brien, Akane Suzuki, Springer Science and Business Media Deutschland GmbH, 2020. 273-281.

BibTeX: Download