METHOD FOR DEVELOPING FINE GRAINED, THERMALLY STABLE METALLIC MATERIAL
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United States of America Patent
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app pub date -
Sep 28, 2009
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Sep 28, 2009
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Abstract
A method for developing fine grained, thermally stable metallic material in which friction stir welding or friction stir processing is performed along at least a portion of the material. Thereafter, a thin layer is removed from either side, or both sides of the material to eliminate the origin of abnormal grain growth occurring when the friction stir welded or friction stir processed material is subjected to subsequent hot forming processes. A sheet of extraneous material is optionally attached to either side, or both sides of the material prior to the friction stir welding or friction stir processing, and this extraneous material is removed after the friction stir welding or friction stir processing. A layer containing pinning particles or a sheet of extraneous material containing pinning particles is further optionally introduced on either side, or both sides of the material prior to the friction stir processing.
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