Crack free metallic articles
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United States of America Patent
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Aug 15, 2000
Issued Date -
N/A
app pub date -
Nov 21, 1997
filing date -
May 1, 1995
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Abstract
A containerless method of producing a crack free metallic article of near-net shape includes melting a filler material into a metallic substrate or seed under conditions chosen to preclude cracking. In a preferred embodiment of the invention, a laser beam is operated at a relatively low power density and at a relatively large beam diameter at the substrate surface for an extended length of time to produce a molten pool with a low aspect ratio. Near-net shape is achieved by applying the process in a closed-loop, multi-axis material deposition system.
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