Effect of nitrocarburizing on shape of titanium alloy parts [electronic resource].

Published:: Washington, D.C. : United States. Dept. of Energy, 1993.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: 20 pages : digital, PDF file
Additional Creators:: Westinghouse Savannah River Company, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

Components are being developed for plutonium casting in support of Lawrence Livermore National Laboratory. A vendor used a proprietary process to grow a nitrocarburized surface layer on a titanium alloy shot sleeve to be used in a prototype die casting machine. The shot sleeve was significantly out-of-round upon return from the vendor and could not be used. Purpose of this study was to determine whether the shape change could have been caused by this surface treatment. Visual observation of disk and ring samples exposed first to surface treatment alone temperature and then the actual nitrocarburizing environment revealed no gross warping in either case. Dimension measurements of each sample before and after both the thermal treatment and the nitrocarburizing revealed no significant changes. Visual examination of the shot sleeve revealed a surface flaw likely made during handling after machining at SRS and before the part was nitrocarburized. The out-of-roundness of the shot sleeve could be related to the damage observed on the surface, but the possibility of warping during the nitrocarburizing cannot be excluded. Nitrocarburization should remain a candidate method to protect titanium alloys from molten metals.

Report Numbers:

E 1.99:wsrc-tr--93-474
wsrc-tr--93-474

Subject(s):

Other Subject(s):

Note:

Published through SciTech Connect.
09/27/1993.
"wsrc-tr--93-474"
"DE94004040"
Clark, E.A.

Type of Report and Period Covered Note:

Topical; 09/01/1993 - 09/01/1993

Funding Information:

AC09-89SR18035

View MARC record | catkey: 14456102