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Title: Near Net Shape production of metal components using LENS

Rapid Prototyping and Near Net Shape manufacturing technologies are the subject of considerable attention and development efforts. At Sandia National Laboratories, one such effort is LENS (Laser Engineered Net Shaping). The LENS process utilizes a stream of powder and a focused Nd YAG laser to build near net shape fully dense metal parts. In this process, a 3-D solid model is sliced, then an X-Y table is rastered under the beam to build each slice. The laser 1 powder head is incremented upward with each slice and the deposition process is controlled via shuttering of the laser. At present, this process is capable of producing fully dense metal parts of iron, nickel and titanium alloys including tool steels and aluminides. Tungsten components have also been produced. A unique aspect of this process is the ability to produce components wherein the composition varies at differing locations in the part. Such compositional variations may be accomplished in either a stepped or graded fashion. In this paper, the details of the process will be described. The deposition mechanism will be characterized and microstructures and their associated properties will be discussed. Examples of parts which have been produced will be shown and issues regardingmore » dimensional control and surface finish will be addressed.« less
Authors:
; ; ; ; ;  [1] ;  [2]
  1. Sandia National Labs., Albuquerque, NM (United States)
  2. Sandia National Labs., Livermore, CA (United States)
Publication Date:
OSTI Identifier:
650377
Report Number(s):
SAND-98-0664C; CONF-980716-
ON: DE98005030; BR: YN0100000; TRN: AHC2DT04%%291
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: 3. Pacific Rim international conference on advanced materials and processing, Honolulu, HI (United States), 12-16 Jul 1998; Other Information: PBD: Mar 1998
Research Org:
Sandia National Labs., Albuquerque, NM (United States)
Sponsoring Org:
USDOE Assistant Secretary for Management and Administration, Washington, DC (United States); USDOE Office of Financial Management and Controller, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 36 MATERIALS SCIENCE; COMPUTER-AIDED MANUFACTURING; POWDERS; LASER RADIATION; ALLOYS; MICROSTRUCTURE; COMPUTER-AIDED DESIGN; SOLID STATE LASERS; MELTING; SURFACE COATING