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

Wang, Ling; Unocic, Kinga; Tortorelli, Peter F.; Santella, Michael L.; Chen, Xiang

doi:10.1016/j.mtla.2021.101035

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

Journal Article · Tue Feb 16 00:00:00 EST 2021 · Materialia

DOI:https://doi.org/10.1016/j.mtla.2021.101035· OSTI ID:1777754

Wang, Ling ^[1]; ^[2]; ^[1]; Santella, Michael L. ^[1]; ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Div.
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

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.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1777754

Alternate ID(s):: OSTI ID: 1781146

Journal Information:: Materialia, Journal Name: Materialia Journal Issue: 12 Vol. 15; ISSN 2589-1529

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Al/Ti ratio
Ni-based superalloy
casting defects
microstructural characterization
γ' precipitation behavior

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

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