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Title: Direct Cast U-6Nb – 2017 Progress on Cylindrical Castings

Abstract

This report describes work to further develop a sound technical basis and best practices for mold design and process parameters for the Direct Casting of U-6wt%Nb components. One major challenge to the production of U-6Nb components is the propensity for niobium segregation during casting and solidification. This is especially true for cylindrical castings where the vertical side walls allow flotation of Nb resulting in severe inverse macrosegregation. In this work, a small (120 mm diameter by 180 mm tall) and large cylinder (250 mm diameter by 310 mm tall) are examined with a focus on reducing, or eliminating, niobium segregation. It is demonstrated that counter gravity casting (top-to-bottom solidification) can be used to minimize segregation in the small cylinder. Attempts to counter gravity cast the large cylinder were unsuccessful, in large part due to size limitations of the current furnace. A path forward for casting of the large cylinders is discussed.

Authors:
 [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
OSTI Identifier:
1398888
Report Number(s):
LA-UR-17-29064
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Aikin, Jr., Robert M. Direct Cast U-6Nb – 2017 Progress on Cylindrical Castings. United States: N. p., 2017. Web. doi:10.2172/1398888.
Aikin, Jr., Robert M. Direct Cast U-6Nb – 2017 Progress on Cylindrical Castings. United States. doi:10.2172/1398888.
Aikin, Jr., Robert M. Wed . "Direct Cast U-6Nb – 2017 Progress on Cylindrical Castings". United States. doi:10.2172/1398888. https://www.osti.gov/servlets/purl/1398888.
@article{osti_1398888,
title = {Direct Cast U-6Nb – 2017 Progress on Cylindrical Castings},
author = {Aikin, Jr., Robert M.},
abstractNote = {This report describes work to further develop a sound technical basis and best practices for mold design and process parameters for the Direct Casting of U-6wt%Nb components. One major challenge to the production of U-6Nb components is the propensity for niobium segregation during casting and solidification. This is especially true for cylindrical castings where the vertical side walls allow flotation of Nb resulting in severe inverse macrosegregation. In this work, a small (120 mm diameter by 180 mm tall) and large cylinder (250 mm diameter by 310 mm tall) are examined with a focus on reducing, or eliminating, niobium segregation. It is demonstrated that counter gravity casting (top-to-bottom solidification) can be used to minimize segregation in the small cylinder. Attempts to counter gravity cast the large cylinder were unsuccessful, in large part due to size limitations of the current furnace. A path forward for casting of the large cylinders is discussed.},
doi = {10.2172/1398888},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {10}
}

Technical Report:

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