Precipitation behavior near shrinkage porosity in a large sand casting of Haynes 282 alloy

Ling Wang; Kinga A. Unocic; Peter F. Tortorelli; Michael Santella; Xiang  (Frank) F. Chen

doi:10.1016/j.mtla.2021.101035

Precipitation behavior near shrinkage porosity in a large sand casting of Haynes 282 alloy

Ling Wang, Kinga A. Unocic, Peter F. Tortorelli, Michael Santella, Xiang  (Frank) F. Chen

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

The precipitation behavior of L1₂ structure Ni₃(Al,Ti)-type γ' precipitates near shrinkage porosity in a large sand casting of Haynes 282 alloy has been investigated by scanning/transmission electron microscopy in conjunction with energy dispersive x-ray spectroscopy. The experimental results revealed that in the carbonitride-rich region close to the shrinkage porosity, γ' precipitates could still form with comparable sizes though at lower volume density than those in the general cast Ni matrix. The resulting γ' precipitates had a very high Al/Ti ratio. Close to oxide-rich pore surfaces, an absence of γ' precipitates was observed due to Al and Ti depletion by forming Al oxides and Ti carbonitrides, respectively. This work suggests that Al rather than Ti plays a dominant role in the formation of γ' precipitates in porous regions in cast Haynes 282 alloys.

Original language	English
Article number	101035
Journal	Materialia
Volume	15
DOIs	https://doi.org/10.1016/j.mtla.2021.101035
State	Published - Mar 2021

Funding

This manuscript has been authored by UT-Battelle, LLC, under contract No. DE-AC05-00OR22725 with the U.S. Department of Energy (DOE). The U.S. government retains and the publisher, by accepting the article for publication, acknowledges that the U.S. government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for U.S. government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). This project is sponsored by the U.S. DOE , Office of Fossil Energy, High Performance Materials, under contract DE- AC05-00OR22725 with ORNL managed by UT Battelle, LLC. Microscopy research was performed, in part, using instrumentation (FEI Talos F200X S/TEM) provided by the Department of Energy, Office of Nuclear Energy, Fuel Cycle R&D Program, and the Nuclear Science User Facilities. We are grateful to M. Fasouletos (NETL) for the programmatic support. We would like to thank E. Manneschmidt, T. Geer, T. Lowe, and D. Stringfield from ORNL for their technical assistance. We also appreciate L. Tan and Y. Yamamoto from ORNL for their technical review of this manuscript.

Funders	Funder number
U.S. Department of Energy
Office of Fossil Energy	DE-AC05-00OR22725
Oak Ridge National Laboratory
UT-Battelle

Keywords

Al/Ti ratio
Casting defects
Microstructural characterization
Ni-based superalloy
γ' precipitation behavior

Access to Document

10.1016/j.mtla.2021.101035

Cite this

@article{ff64d0c23af843428ccd6f77803ee708,

title = "Precipitation behavior near shrinkage porosity in a large sand casting of Haynes 282 alloy",

abstract = "The precipitation behavior of L12 structure Ni3(Al,Ti)-type γ' precipitates near shrinkage porosity in a large sand casting of Haynes 282 alloy has been investigated by scanning/transmission electron microscopy in conjunction with energy dispersive x-ray spectroscopy. The experimental results revealed that in the carbonitride-rich region close to the shrinkage porosity, γ' precipitates could still form with comparable sizes though at lower volume density than those in the general cast Ni matrix. The resulting γ' precipitates had a very high Al/Ti ratio. Close to oxide-rich pore surfaces, an absence of γ' precipitates was observed due to Al and Ti depletion by forming Al oxides and Ti carbonitrides, respectively. This work suggests that Al rather than Ti plays a dominant role in the formation of γ' precipitates in porous regions in cast Haynes 282 alloys.",

keywords = "Al/Ti ratio, Casting defects, Microstructural characterization, Ni-based superalloy, γ' precipitation behavior",

author = "Ling Wang and Unocic, {Kinga A.} and Tortorelli, {Peter F.} and Michael Santella and Chen, {Xiang  (Frank) F.}",

note = "Publisher Copyright: {\textcopyright} 2021",

year = "2021",

month = mar,

doi = "10.1016/j.mtla.2021.101035",

language = "English",

volume = "15",

journal = "Materialia",

issn = "2589-1529",

publisher = "Elsevier",

}

TY - JOUR

T1 - Precipitation behavior near shrinkage porosity in a large sand casting of Haynes 282 alloy

AU - Wang, Ling

AU - Unocic, Kinga A.

AU - Tortorelli, Peter F.

AU - Santella, Michael

AU - Chen, Xiang  (Frank) F.

PY - 2021/3

Y1 - 2021/3

N2 - The precipitation behavior of L12 structure Ni3(Al,Ti)-type γ' precipitates near shrinkage porosity in a large sand casting of Haynes 282 alloy has been investigated by scanning/transmission electron microscopy in conjunction with energy dispersive x-ray spectroscopy. The experimental results revealed that in the carbonitride-rich region close to the shrinkage porosity, γ' precipitates could still form with comparable sizes though at lower volume density than those in the general cast Ni matrix. The resulting γ' precipitates had a very high Al/Ti ratio. Close to oxide-rich pore surfaces, an absence of γ' precipitates was observed due to Al and Ti depletion by forming Al oxides and Ti carbonitrides, respectively. This work suggests that Al rather than Ti plays a dominant role in the formation of γ' precipitates in porous regions in cast Haynes 282 alloys.

AB - The precipitation behavior of L12 structure Ni3(Al,Ti)-type γ' precipitates near shrinkage porosity in a large sand casting of Haynes 282 alloy has been investigated by scanning/transmission electron microscopy in conjunction with energy dispersive x-ray spectroscopy. The experimental results revealed that in the carbonitride-rich region close to the shrinkage porosity, γ' precipitates could still form with comparable sizes though at lower volume density than those in the general cast Ni matrix. The resulting γ' precipitates had a very high Al/Ti ratio. Close to oxide-rich pore surfaces, an absence of γ' precipitates was observed due to Al and Ti depletion by forming Al oxides and Ti carbonitrides, respectively. This work suggests that Al rather than Ti plays a dominant role in the formation of γ' precipitates in porous regions in cast Haynes 282 alloys.

KW - Al/Ti ratio

KW - Casting defects

KW - Microstructural characterization

KW - Ni-based superalloy

KW - γ' precipitation behavior

UR - http://www.scopus.com/inward/record.url?scp=85101578696&partnerID=8YFLogxK

U2 - 10.1016/j.mtla.2021.101035

DO - 10.1016/j.mtla.2021.101035

M3 - Article

AN - SCOPUS:85101578696

SN - 2589-1529

VL - 15

JO - Materialia

JF - Materialia

M1 - 101035

ER -

Precipitation behavior near shrinkage porosity in a large sand casting of Haynes 282 alloy

Abstract

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cite this