Abstract
A simplified aging treatment yielded microstructural features in Ni-based alloy that produced strengthening behavior normally associated with more complex thermal processing. Specifically, a time series of 800 °C heat treatments was used to study the evolution of grain boundary carbides and γ’ precipitates and the corresponding hardness, tensile strength, and creep resistance. These analyses and computational thermodynamic calculations revealed that a 4-hour aging treatment produced appropriately sized and uniformly distributed coherent γ’ precipitates and the desired Cr-rich carbides like those formed during the conventional two-step heat treatment. Accordingly, the former heat treatment produced targeted typical strength levels for this alloy.
| Original language | English |
|---|---|
| Pages (from-to) | 416-420 |
| Number of pages | 5 |
| Journal | Scripta Materialia |
| Volume | 162 |
| DOIs | |
| State | Published - Mar 15 2019 |
Funding
Funding was provided by the U.S. Department of Energy (DOE), Office of Fossil Energy, Crosscutting Research Program, in support of the DOE project on Boiler Materials for Advanced Ultra Supercritical Steam Conditions. The microscopy was supported by the Center for Nanophase Materials Sciences (CNMS), which is sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. The authors wish to thank R.R. Unocic, K.L. More, X. Chen, P. J. Maziasz and G. Muralidharan for providing comments on the manuscript. T.M. Lowe, T. Geer, D.W. Coffey and J.L. Moser assisted with the experimental work.
| Funders | Funder number |
|---|---|
| Center for Nanophase Materials Sciences | |
| Office of Basic Energy Sciences | |
| Scientific User Facilities Division | |
| U.S. Department of Energy | |
| Office of Fossil Energy |
Keywords
- Aging treatment
- Carbides
- Grain boundaries
- Ni-base alloys
- NiAl
- Scanning transmission electron microscopy (STEM)