Spray Formed Ni-Cr Alloys for Shipboard Waste Incinerators
Abstract
The Naval Surface Warfare Center, Carderock Division, (NSWCCD) has produced several spray formed Ni-Cr alloys in a research effort to identify a replacement for conventionally processed Alloy 690 (60Ni-30Cr-9.5Fe) waste incinerator liners. Six alloys with chromium contents ranging from 37 to 50 weight percent were chosen for evaluation; 61.5Ni-37Cr-1.5Nb, 55.5Ni-43Cr-1.5Zr, 55.5Ni-43Cr-1.5Nb, Alloy 671 (52Ni-48Cr), 48.5Ni-50Cr-1.5Nb, and 50Ni-50. These spray formed materials were characterized microstructurally and evaluated for strength, ductility, and hot workability. These measurements were compared with both conventional and spray formed Alloy 690 values. Room and high temperature tensile properties showed that as-sprayed Ni-Cr alloys with chromium contents of 43% or greater exhibited mechanical properties that were equivalent to or better than typical values for wrought Alloy 690. This has identified these materials as candidates for corrosion testing and possible replacement of Alloy 690. It is expected that higher chromium contents will improve corrosion resistance. Hot rolling of the spray formed high chromium alloys was performed easily under laboratory conditions, showing that these alloys in the spray formed condition can endure post processing without brittle cracking problems. This hot working improved the mechanical properties to values that exceeded their conventional wrought counterparts for both strength and ductility. This shows that any of the alloys in their spray formed and hot worked condition can be considered as possible replacements for Alloy 690, and should be subjected to corrosion tests.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1998
- Accession Number
- ADA359197
Entities
People
- Craig J. Madden
- Leslie K. Kohler
- Louis F. Aprigliano
Organizations
- Naval Surface Warfare Center Carderock Division